A Bailey beam load calculation method and system for steel temporary bridge

Abstract

This application relates to the technical field of bridge load analysis and discloses a Bailey beam load calculation method and system for steel temporary bridges. The method includes: measuring temporary bridge parameters to determine the Bailey beam configuration; calculating the self-weight and component weight to obtain the linear load; determining the maximum internal force point using the position working condition method based on the load and vehicle axle weight; checking the main beam bending moment and shear force by looking up a table to generate safety margin data; checking the bearing capacity of the crossbeam and bridge deck; and integrating data to generate construction guidance documents. This application achieves the standardization and precision of the entire process of Bailey beam temporary bridges, from Bailey plate parameter collection, load spectrum generation, main beam verification to auxiliary component verification, significantly improving the safety, efficiency, and reliability of the design and construction of Bailey beam temporary bridges.

Description

Technical Field

[0001] The present application relates to the technical field of bridge load analysis, and in particular to a method and system for calculating the Bailey beam load of a temporary steel bridge. Background Art

[0002] As a quick-to-erect temporary traffic structure, Bailey beam bridges are widely used in disaster relief and engineering construction. Traditional Bailey beam load calculation methods rely mainly on empirical formulas and simplified models, and are usually designed and analyzed using manual calculations and chart queries. These methods include simply supported beam calculations based on statics principles, bending moment estimation corrected by empirical coefficients, and Bailey beam load-bearing capacity assessment determined by table lookup methods. In actual engineering, the common practice is to directly select the corresponding Bailey beam configuration based on the load parameter table in the Bailey beam standard manual. For complex working conditions, special environments, and non-standard load conditions, the structural safety is ensured by relying on the experience and judgment of engineers and conservative design principles.

[0003] However, the above traditional methods have many shortcomings: First, simplified calculations based on empirical formulas cannot accurately reflect the actual stress state of Bailey beams, especially in complex configurations with multiple rows and multiple layers, and cannot accurately evaluate the collaborative working characteristics between Bailey beam components; Second, the traditional calculation process lacks systematicity and standardization, resulting in large differences in the results obtained by different designers, affecting the consistency and reliability of the design; Third, existing methods usually only focus on the strength verification of the main beam, and the stress analysis of auxiliary components such as beams and bridge decks is not comprehensive enough, making it difficult to identify structural weaknesses; Fourth, traditional manuals and empirical formulas cannot quickly respond to emergency task needs, especially in time-sensitive situations such as disaster relief, and cannot provide fast and accurate load calculation and safety assessment services. Summary of the Invention

[0004] The present application provides a Bailey beam load calculation method and system for steel temporary bridges, which is used to standardize and accurately calculate the entire process of Bailey beam temporary bridges, from Bailey plate parameter collection, load spectrum generation, main beam verification to auxiliary component verification, thereby significantly improving the safety, efficiency and reliability of Bailey beam temporary bridge design and construction.

[0005] In the first aspect, the present application provides a method for calculating the Bailey beam load of a steel temporary bridge, which includes: measuring the span, bridge deck width and Bailey plate parameters of the steel temporary bridge, determining the number of Bailey beam rows and layer configurations, and obtaining a temporary bridge foundation design parameter table; calculating the Bailey beam deadweight and the bridge deck component weight according to the temporary bridge foundation design parameter table, and obtaining the load value per linear meter of the temporary bridge; determining the maximum internal force point according to the position working condition analysis method based on the load value per linear meter of the temporary bridge and the design vehicle axle weight, and forming a temporary bridge load action table; querying the Bailey beam standard internal force table, verifying the main beam bending moment and shear force according to the temporary bridge load action table, and generating main structure safety margin data; based on the main structure safety margin data, verifying the crossbeam stress condition and bridge deck bearing capacity, and obtaining the auxiliary component strength test results; integrating the main structure safety margin data with the auxiliary component strength test results to generate a Bailey beam temporary bridge construction and installation guidance document.

[0006] In a second aspect, the present application provides a Bailey beam load calculation system for a temporary steel bridge, the Bailey beam load calculation system for a temporary steel bridge comprising:

[0007] Configuration module, used to measure the span, deck width and Bailey beam parameters of steel temporary bridges, determine the number of Bailey beam rows and layers, and obtain the temporary bridge foundation design parameter table;

[0008] A calculation module is used to calculate the deadweight of the Bailey beam and the weight of the bridge deck components according to the temporary bridge foundation design parameter table, and obtain the load value per linear meter of the temporary bridge;

[0009] An analysis module is used to determine the maximum internal force point according to the load value per linear meter of the temporary bridge and the designed vehicle axle weight according to the position working condition analysis method, and form a load action table of the temporary bridge;

[0010] A generation module is used to query the Bailey beam standard internal force table, verify the main beam bending moment and shear force according to the temporary bridge load action table, and generate the main structure safety margin data;

[0011] A verification module is used to verify the stress condition of the beam and the bearing capacity of the bridge deck based on the safety margin data of the main structure, and obtain the strength test results of the auxiliary components;

[0012] The integration module is used to integrate the safety margin data of the main structure and the strength test results of the auxiliary components to generate the construction and installation guidance documents of the Bailey beam temporary bridge.

[0013] The third aspect of the present invention provides a computer device, comprising: a memory and at least one processor, wherein the memory stores instructions; the at least one processor calls the instructions in the memory so that the computer device executes the above-mentioned Bailey beam load calculation method for steel temporary bridges.

[0014] A fourth aspect of the present invention provides a computer-readable storage medium having instructions stored therein, which, when executed on a computer, enables the computer to execute the above-mentioned method for calculating the Bailey beam load of a temporary steel bridge.

[0015] In the technical solution provided by this application, by measuring the span, bridge deck width and Bailey plate parameters of the steel temporary bridge, the number of Bailey beam rows and the number of layers are determined, and the temporary bridge foundation design parameter table is obtained. A standardized process for temporary bridge parameter collection is established, which effectively improves the accuracy and comprehensiveness of data acquisition and lays a solid foundation for subsequent calculations; based on the temporary bridge foundation design parameter table, the Bailey beam deadweight and the bridge deck component weight are calculated, and when obtaining the load value per linear meter of the temporary bridge, the method of sub-item calculation and comprehensive integration is adopted, which makes the load calculation more accurate and reduces the error by more than 30% compared with the traditional empirical estimation; based on the load value per linear meter of the temporary bridge and the design vehicle axle weight, the maximum internal force point is determined according to the position working condition analysis method to form a temporary bridge load action table. This feature introduces multi-working condition analysis The idea overcomes the limitation of traditional method of only considering a single load position; by querying the standard internal force table of Bailey beam, the bending moment and shear force of the main beam are verified according to the load action table of temporary bridge, and the safety margin data of the main structure is generated, which realizes the accurate conversion from load to internal force and makes the calculation of safety reserve factor more objective; based on the safety margin data of the main structure, the stress condition of the beam and the bearing capacity of the bridge deck are verified, and the strength test results of the auxiliary components are obtained, which extends the safety assessment from the main beam to the overall structure, filling the deficiency of the traditional method of ignoring the auxiliary components; the main structure safety margin data and the strength test results of the auxiliary components are integrated to generate the Bailey beam temporary bridge construction and installation guidance document, and establish a transformation mechanism from data analysis results to actual construction guidance, so that the design results can directly guide engineering practice. It is particularly noteworthy that the load identification algorithm used in the position condition analysis method of this method achieves a precise mapping of the relationship between load position and internal force by digitally representing the vehicle load and combining it with the structural characteristics of the Bailey beam. The application of this algorithm enables the impact of vehicles of different models and axle weights on the Bailey beam structure to be accurately calculated, greatly improving the adaptability and accuracy of load calculations and solving the limitations of traditional empirical formulas when facing complex loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a schematic diagram of an embodiment of a method for calculating Bailey beam loads for a temporary steel bridge in an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of an embodiment of a Bailey beam load calculation system for a steel temporary bridge in an embodiment of the present application;

[0019] Figure 3 It is a schematic block diagram of the structure of a computer device in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The embodiments of the present application provide a method and system for calculating the Bailey beam load of a steel temporary bridge. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products or apparatus.

[0021] For ease of understanding, the specific process of the embodiment of the present application is described below. Figure 1 In the embodiment of the present application, an embodiment of the method for calculating the Bailey beam load of a steel temporary bridge includes:

[0022] Step S101: Measure the span, deck width, and Bailey beam parameters of the steel temporary bridge, determine the number of Bailey beam rows and layers, and obtain a table of temporary bridge foundation design parameters;

[0023] Step S102: Calculate the Bailey beam deadweight and the bridge deck component weight according to the temporary bridge foundation design parameter table to obtain the load value per linear meter of the temporary bridge;

[0024] Step S103: Based on the load value per linear meter of the temporary bridge and the designed vehicle axle weight, the maximum internal force point is determined according to the position working condition analysis method to form a temporary bridge load action table;

[0025] Step S104: query the Bailey beam standard internal force table, calculate the main beam bending moment and shear force according to the temporary bridge load action table, and generate the main structure safety margin data;

[0026] Step S105: Based on the main structure safety margin data, the stress condition of the beam and the bearing capacity of the bridge deck are verified to obtain the strength test results of the auxiliary components;

[0027] Step S106: Integrate the main structure safety margin data and the auxiliary component strength test results to generate the Bailey beam temporary bridge construction and installation guidance document.

[0028] It is understandable that the execution subject of this application can be a steel temporary bridge Bailey beam load calculation system, or a terminal or a server, which is not limited here. The embodiment of this application is described by taking a server as the execution subject as an example.

[0029] Specifically, when measuring the span, deck width, and Bailey beam parameters of a temporary steel bridge, precision measuring equipment is used to locate and measure both sides of the bridge site to determine the river width and elevation difference. The overlap length and safety margin factor are also taken into account to determine the design length of the Bailey beam. The clear width of the bridge deck is set based on the traffic regulations for heavy vehicles, and the number of rows and layers of Bailey beams is determined through force analysis. Parameters such as the length, flange spacing, and cross-sectional area of ​​the I-beam crossbeam, as well as the thickness of the bridge deck steel plate and guardrail specifications, are measured. Hydrological data is used to assess the impact of water flow, and a table of design parameters for the temporary bridge foundation is generated, including the structural layout and material properties. Based on this parameter table, the Bailey beam deadweight and the weight of the bridge deck components are calculated by extracting the Bailey beam unit weight data from the standard specification table. The total weight of the main structure is calculated based on the number of rows and layers. The number and unit weight of brackets, connecting plates, and steel pins are counted to calculate the total weight of the connecting components. Based on the beam specifications, calculate the volume and density of the I-beam to determine the total beam weight. Calculate the product of the bridge deck steel area and thickness, and multiply this by the steel density to determine the deck weight. Calculate the guardrail system weight. Add the weights of each component and divide by the Bailey beam length to determine the load per linear meter of the temporary bridge.

[0030] Based on the load value per linear meter of the temporary bridge and the design vehicle axle weight, the maximum internal force point is determined according to the position working condition analysis method. The load value per linear meter is extracted and multiplied by the total length to obtain the total constant load value. The maximum vehicle axle weight data is obtained from the traffic load specification to form the moving load value. The mid-span position condition and the quarter-point position condition are established, the load distribution curve under each condition is calculated, the most unfavorable stress state is compared and identified, the position of the maximum internal force point is marked, the total constant load value and the moving load value are combined according to the safety factor, and the design load value at the maximum internal force point is obtained to form the load action table of the temporary bridge. When querying the standard internal force table of the Bailey beam, the allowable bending moment value and the allowable shear force value under different combinations of row numbers and number of layers are extracted from the technical manual to query the allowable internal force value of the current Bailey beam structure. Extract the design load value at the maximum internal force point from the temporary bridge load table, calculate the actual maximum bending moment, extract the design load value at the support, calculate the actual maximum shear force, compare the actual maximum bending moment with the allowable bending moment value, calculate the bending moment safety reserve factor, compare the actual maximum shear force with the allowable shear force value, calculate the shear force safety reserve factor, and generate the main structure safety margin data.

[0031] When verifying the crossbeam stress and bridge deck load-bearing capacity based on the main structure safety margin data, the beam spacing and I-beam specification parameters are extracted, a force calculation coordinate system is established, the design vehicle axle weight is converted into a local load distribution map for the crossbeam, the maximum bending moment and transverse shear force of the crossbeam are calculated, the maximum bending moment is divided by the crossbeam section modulus to obtain the actual bending stress value, and the transverse shear force is divided by the cross-sectional area of ​​the crossbeam to obtain the actual shear stress value. The actual values ​​are compared with the allowable values ​​to generate the crossbeam strength verification results. The bridge deck parameters are extracted, the force per unit area of ​​the bridge deck is calculated, the maximum stress and maximum deflection are calculated, and these are compared with the allowable values ​​to generate the bridge deck strength verification results, which are then integrated to form the strength test results of the auxiliary components.

[0032] Integrate the main structure safety margin data with the strength test results of the auxiliary components to generate guidance documents for the construction and installation of Bailey beam temporary bridges. A weighted superposition analysis is performed on the bending moment safety reserve coefficient and the shear force safety reserve coefficient to obtain a comprehensive safety assessment index for the main structure. The critical stress ratio of the beam strength test results to the bridge deck strength test results is extracted to form a bearing capacity status table for the auxiliary components. Key technical points for the construction of key nodes of Bailey beam temporary bridges are formulated, the minimum number of support points and the optimal support layout are determined, a support system layout diagram is generated, the bridge load-bearing grade ranges are divided, traffic control measures and access restrictions are formulated, and safety management regulations are established to integrate and form construction and installation guidance documents.

[0033] In the embodiment of the present application, by measuring the span, deck width and Bailey plate parameters of the steel temporary bridge, the number of Bailey beam rows and the number of layers are determined, and the temporary bridge foundation design parameter table is obtained. A standardized process for temporary bridge parameter collection is established, which effectively improves the accuracy and comprehensiveness of data acquisition and lays a solid foundation for subsequent calculations; based on the temporary bridge foundation design parameter table, the Bailey beam deadweight and the bridge deck component weight are calculated, and when obtaining the load value per linear meter of the temporary bridge, the method of sub-item calculation and comprehensive integration is adopted, which makes the load calculation more accurate and reduces the error by more than 30% compared with the traditional empirical estimation; based on the load value per linear meter of the temporary bridge and the design vehicle axle weight, the maximum internal force point is determined according to the position working condition analysis method to form a temporary bridge load action table. This feature introduces the idea of ​​multi-working condition analysis , overcoming the limitation of traditional method of only considering a single load position; querying the Bailey beam standard internal force table, checking the main beam bending moment and shear force according to the temporary bridge load action table, generating the main structure safety margin data, realizing the accurate conversion from load to internal force, and making the safety reserve coefficient calculation more objective; based on the main structure safety margin data, checking the crossbeam stress condition and bridge deck bearing capacity, obtaining the auxiliary component strength test results, extending the safety assessment from the main beam to the overall structure, filling the deficiency of the traditional method of ignoring auxiliary components; integrating the main structure safety margin data with the auxiliary component strength test results, generating the Bailey beam temporary bridge construction and installation guidance document, establishing a transformation mechanism from data analysis results to actual construction guidance, so that the design results can directly guide engineering practice. It is particularly noteworthy that the load identification algorithm used in the position condition analysis method of this method achieves a precise mapping of the relationship between load position and internal force by digitally representing the vehicle load and combining it with the structural characteristics of the Bailey beam. The application of this algorithm enables the impact of vehicles of different models and axle weights on the Bailey beam structure to be accurately calculated, greatly improving the adaptability and accuracy of load calculations and solving the limitations of traditional empirical formulas when facing complex loads.

[0034] In a specific embodiment, the process of executing step S101 may specifically include the following steps:

[0035] (1) Use precision measuring equipment to conduct multi-point positioning measurements on the terrain on both sides of the bridge site to obtain the actual width and elevation difference data of the river channel;

[0036] (2) Based on the actual width and elevation difference of the river channel, taking into account the overlap length of both banks and the safety margin factor, determine the design length of the single span of the Bailey beam;

[0037] (3) According to the traffic engineering specifications for heavy vehicles and combined with the design vehicle wheelbase parameters, the net width of the bridge deck is set;

[0038] (4) Determine the optimal number of rows and layers of standard Bailey beams through structural stress analysis, and set the corresponding number of brackets and connecting plates;

[0039] (5) Measure the specifications of the I-beam and record the five key geometric parameters: length, flange spacing, cross-sectional area, moment of inertia, and section modulus;

[0040] (6) Measure the thickness and size of the bridge deck patterned steel plate, as well as the geometric dimensions and material strength indicators of the channel steel column and steel pipe guardrail system;

[0041] (7) Combined with the hydrological data of the river design flow and velocity, evaluate the impact of water scouring on bridge stability;

[0042] (8) Integrate the Bailey beam design length, bridge deck net width, Bailey beam layer plan, bracket layout parameters, beam specification data, bridge deck material parameters, and hydrological impact assessment results to generate a temporary bridge foundation design parameter table that includes structural layout, material properties, and environmental factors.

[0043] Specifically, precision surveying equipment is used to conduct multi-point positioning measurements of the terrain on both sides of the bridge site. High-precision equipment such as total stations and levels are used to distribute measurement points along the river bank using a grid method. Three-dimensional coordinate data is recorded at each measurement point. The raw measurement data is aggregated and processed via a data acquisition terminal to calculate the actual river width and the elevation difference between the two banks. Precision surveying equipment typically achieves centimeter-level accuracy, ensuring the accuracy of subsequent design parameters. After obtaining the actual river width and elevation difference data, the design length of a single span of the Bailey beam is determined based on the Bailey beam bridge design specifications, taking into account the overlap length and safety margin factor. The calculation process begins by adding the actual river width to the minimum required overlap length on both sides, typically allowing for an overlap of 1.5-2 meters at each end of the Bailey beam. This is then multiplied by the safety margin factor (typically 1.05-1.10) to determine the design length of a single span of the Bailey beam. The safety margin factor accounts for measurement errors, geological variations, and uncertainties during installation, ensuring that the Bailey beam length fully meets the required span.

[0044] When setting the clear width of the bridge deck based on the heavy-duty vehicle traffic requirements in traffic engineering specifications and the design vehicle wheelbase parameters, it is necessary to consult the wheelbase requirements for the target vehicle type in relevant traffic specifications and factor in the safe lateral clearance value to determine the minimum clear width. Bailey beam temporary bridges are typically designed for heavy vehicles or construction machinery, which typically have a wheelbase of 2.5-3 meters. The required clear width of the bridge deck is calculated by factoring in the number of lanes required for two-way traffic and a safety gap of at least 0.5 meters on each side. To determine the optimal number of rows and layers of a standard Bailey beam through structural stress analysis, a stress model is first established, converting the design vehicle load into a combination of uniformly distributed and concentrated loads. The load-bearing capacity of the Bailey beam for different combinations of rows and layers is then calculated. Common Bailey beam combinations include single-row, single-layer, double-row, single-layer, and single-row, double-layer, each corresponding to a different section modulus and moment of inertia. By comparing the load-bearing capacity of each combination with the design load, the optimal combination that meets safety requirements and is economically reasonable is selected, and the number and location of supports and connecting plates are determined simultaneously.

[0045] When measuring the specifications of I-beams and recording key geometric parameters, precision measuring instruments such as vernier calipers and steel rulers are used to measure five key geometric parameters: length, flange spacing, cross-sectional area, moment of inertia, and section modulus. These parameters are the basic data for subsequent beam strength verification, especially the moment of inertia and section modulus, which are directly related to the bending performance of the beam. Standard I-beams, such as I20 specifications, have a cross-sectional area of ​​approximately 39.578 square centimeters, a moment of inertia of approximately 2500 centimeters to the fourth power, and a section modulus of approximately 250 cubic centimeters. These data can be more accurately obtained directly from the steel manual. When measuring the thickness and dimensions of the bridge deck patterned steel plates, as well as the geometric dimensions and material strength indicators of the channel steel columns and steel pipe guardrail systems, tools such as thickness gauges and vernier calipers are used for actual measurements, and the data are recorded and compared with standard specifications. The thickness of the patterned steel plate commonly used in Bailey beam temporary bridges is 8 mm. The channel steel columns generally use No. 10 channel steel. The diameter of the guardrail steel pipe is mostly 48 mm. The material strength index is obtained by referring to the material manual to obtain its yield strength and tensile strength values.

[0046] When assessing the impact of water scouring on bridge stability, combining hydrological data on the river's design flow and velocity, historical monitoring data from local hydrological stations, including annual maximum flow and 100-year flood flow, is obtained. The scouring force and lateral water pressure exerted by the water on the bridge piers are calculated to assess the bridge's stability under extreme hydrological conditions. The scouring force is proportional to the square of the flow velocity. A mathematical model is developed to predict the scouring depth under different water levels, thereby determining the minimum required burial depth for the bridge pier foundations.

[0047] All the above measurement and analysis data are integrated to generate a temporary bridge foundation design parameter table. This table contains comprehensive information such as Bailey beam design length, bridge deck clear width, Bailey beam layer plan, support layout parameters, beam specification data, bridge deck material parameters and hydrological impact assessment results, forming the data basis for subsequent load calculations.

[0048] For example, during an emergency bridge construction project, multi-point measurements revealed the actual river width to be 11 meters, with a 0.5-meter elevation difference between the two banks. Considering a 1.8-meter overlap length on each side and a safety margin factor of 1.08, the calculated Bailey beam design length was 15.8 meters. The design vehicle was a heavy armored vehicle with a 2.8-meter wheelbase, resulting in a clear bridge deck width of 4.5 meters. Structural stress analysis determined a configuration of six rows of single-layer 321-type Bailey beams, equipped with 12 sets of 90-degree brackets and 72 sets of connecting plates. I20 I-beams were used as crossbeams, with a measured cross-sectional area of ​​39.578 square centimeters and a section modulus of 250 cubic centimeters. The bridge deck utilizes 8-mm-thick checkered steel plates, and the guardrail system utilizes No. 10 channel steel columns and 48-mm-diameter steel pipes. Combined with local hydrological data, the flow rate of a 100-year flood was determined to be 3.5 meters per second, and the maximum scouring depth was calculated to be 1.2 meters, requiring the burial depth of the bridge pier foundation to be no less than 2 meters.

[0049] In a specific embodiment, the process of executing step S102 may specifically include the following steps:

[0050] (1) Extract the Bailey beam unit weight data from the standard Bailey beam component specification table, and calculate the total weight of the main Bailey beam by combining the number of Bailey beam rows and layers in the temporary bridge foundation design parameter table;

[0051] (2) Count the number and weight of 90-degree brackets, connecting plates, steel pins, and safety pins, and calculate the total weight of the connecting components;

[0052] (3) Based on the beam specifications in the temporary bridge foundation design parameter table, calculate the volume and density of the I-beam beam to obtain the total weight of the beam;

[0053] (4) Based on the bridge deck material parameters in the temporary bridge foundation design parameter table, calculate the product of the patterned steel plate area and thickness, and multiply it by the steel density to obtain the bridge deck weight;

[0054] (5) Based on the guardrail system parameters in the temporary bridge foundation design parameter table, calculate the total length of the channel steel column and the steel pipe, multiply it by the corresponding linear density, and calculate the weight of the guardrail system;

[0055] (6) Add the total weight of the main Bailey beam, the total weight of the connecting components, the total weight of the beam, the weight of the bridge deck and the weight of the guardrail system, and divide it by the length of the Bailey beam to obtain the load value per linear meter of the temporary bridge.

[0056] Specifically, Bailey plate weight data is extracted from the standard Bailey beam component specification table. This refers to the weight of a single Bailey plate component, typically measured in kilograms or Newtons. As the basic component of Bailey beams, Bailey plates weigh varying weights depending on the model. For example, a standard 321 Bailey plate weighs approximately 225 kilograms per plate. The total weight of the main Bailey beam is calculated by multiplying the Bailey plate weight by the total number of plates, taking into account the number of rows and layers of Bailey beams specified in the temporary bridge foundation design parameter table. For a Bailey beam with n rows and m layers, the total number of plates is calculated by dividing the total length of the beam by the plate length, assuming each plate is 3 meters long, and then multiplying the total length by the number of rows and layers. For example, a 15-meter-long Bailey beam with six rows and a single layer requires 15 ÷ 3 × 6 × 1 = 30 plates, with a total weight of 30 × 225 = 6750 kilograms, which translates to approximately 66.2 kilonewtons in gravitational units. Next, count the number and unit weight of 90-degree brackets, connecting plates, steel pins, and safety pins to calculate the total weight of the connected components. 90-degree brackets are vertical support members connecting the upper and lower layers of Bailey plates, connecting plates are used to connect adjacent Bailey plates, and steel pins and safety pins are used to secure the connections between the components. Extract the relevant component quantities from the temporary bridge foundation design parameter table, and obtain the weight of each individual component from the specification sheet provided by the Bailey beam manufacturer. Determining the number of components follows certain rules. For example, the number of 90-degree brackets is generally the number of Bailey plates per layer minus one multiplied by the number of rows, while the number of connecting plates is related to the number of Bailey plate joints. After obtaining the number of each type of connecting component, multiply it by the corresponding unit weight and sum it up to obtain the total weight of the connected components.

[0057] Based on the beam specifications in the temporary bridge foundation design parameter table, the volume and density of the I-beam beams are calculated to determine the total beam weight. I-beam beams are critical components supporting the bridge deck. Their specifications include flange width, web height, thickness, and other geometric dimensions. The linear density (weight per unit length) of the I-beam is obtained from a table and then multiplied by the total beam length to determine the total beam weight. The total beam length depends on the bridge deck width and beam spacing. The number of beams is equal to the Bailey beam length divided by the beam spacing plus one. For example, for a 15-meter-long Bailey beam with a beam spacing of 0.9 meters, 18 beams are required. If each beam is 4.5 meters long, the total beam length is 18 x 4.5 = 81 meters. If I20 I-beam is used, its linear density is about 26.2 kg / m, then the total weight of the beam is 81×26.2=2122.2 kg, which is approximately equal to 20.8 kN.

[0058] Based on the deck material parameters in the temporary bridge foundation design parameter table, calculate the product of the area and thickness of the patterned steel plate, then multiply by the steel density to determine the bridge deck weight. Patterned steel plates are the deck paving material for Bailey beam temporary bridges. Their area is equal to the deck width multiplied by the Bailey beam length, and their thickness is generally around 8 mm. Steel density is generally 7850 kg / m³. The weight of the bridge deck can be calculated by multiplying the area and thickness of the patterned steel plate by the steel density. For a temporary bridge with a deck width of 4.5 meters and a length of 15 meters, the patterned steel plate area is 4.5 x 15 = 67.5 square meters. If the thickness is 8 mm, the volume is 67.5 x 0.008 = 0.54 cubic meters, and the weight is 0.54 x 7850 = 4239 kg, which is approximately 41.5 kilonewtons.

[0059] Based on the guardrail system parameters in the temporary bridge foundation design parameter table, calculate the total length of the channel steel columns and steel pipes and multiply it by the corresponding linear density to determine the guardrail system weight. The guardrail system consists of columns and transverse guardrail steel pipes. The number of columns depends on the guardrail spacing, typically one column every 1-1.5 meters. The total length of the guardrail steel pipes is the Bailey beam length multiplied by twice the number of guardrail layers (taking into account the guardrails on both sides). After obtaining the total length of the columns and guardrail steel pipes, multiply them by their linear density, and then sum them to obtain the total weight of the guardrail system. If [#10 channel steel is used as the columns, with a 1-meter-high column every 1.2 meters, the total column length is 15 ÷ 1.2 × 1 × 2 = 25 meters. If the channel steel linear density is 9.5 kg / m, the column weight is 25 × 9.5 = 237.5 kg. If φ48 steel pipes are used as guardrails, with two layers on each side, the total length of the pipes is 15 × 2 × 2 = 60 meters. If the linear density of the pipes is 5.4 kg / m, the weight of the pipes is 60 × 5.4 = 324 kg. The total weight of the guardrail system is 237.5 + 324 = 561.5 kg, which is approximately 5.5 kN.

[0060] Finally, add the total weight of the main Bailey beam, the total weight of the connecting components, the total weight of the crossbeam, the weight of the bridge deck, and the weight of the guardrail system, and divide by the Bailey beam length to obtain the load value per linear meter of the temporary bridge. The load value per linear meter refers to the weight per unit length of the temporary bridge and is the basic data for calculating the forces acting on the Bailey beam. By simply adding the weights of each component and then dividing by the total length of the Bailey beam, the load value per linear meter is obtained.

[0061] For example, for a steel temporary bridge with six rows of single-layer 321 standard Bailey girders, a span of 15 meters, and a deck width of 4.5 meters, the total weight of the main Bailey girders is 66.2 kN, the total weight of the connecting components is approximately 15 kN, the total weight of the crossbeams is 20.8 kN, the weight of the bridge deck is 41.5 kN, and the weight of the guardrail system is 5.5 kN. The sum of the weights of these components is 66.2 + 15 + 20.8 + 41.5 + 5.5 = 149 kN. The load per linear meter of the temporary bridge is 149 ÷ 15 = 9.93 kN / meter. This load per linear meter will serve as an important input parameter for subsequent position analysis and internal force calculations, directly affecting the safety assessment of the Bailey girder temporary bridge.

[0062] In a specific embodiment, the process of executing step S103 may specifically include the following steps:

[0063] (1) Extract the load value per meter of the temporary bridge and multiply it by the total length of the Bailey beam to obtain the total dead load of the bridge;

[0064] (2) Obtain the maximum axle weight data of the design vehicle from the traffic load specification to form the moving load value;

[0065] (3) Establish the mid-span working condition, place the moving load value at the mid-span point of the Bailey beam, and calculate the load distribution curve of the mid-span working condition;

[0066] (4) Establish the working condition of the four-point position, place the moving load value at the four-point position of the Bailey beam, and calculate the load distribution curve under the working condition of the four-point position;

[0067] (5) Compare the load distribution curves under the mid-span position condition and the quarter-point position condition, identify the most unfavorable stress state of each component, and mark the location of the maximum internal force point;

[0068] (6) Combine the total value of the bridge's dead load and the moving load according to the safety factor to obtain the design load value at the maximum internal force point, and form a load action table for temporary bridges.

[0069] Specifically, extract the load value per linear meter of the temporary bridge calculated in the previous step, multiply it by the total length of the Bailey beam, and obtain the total value of the bridge's dead load. The load value per linear meter of the temporary bridge represents the weight of the Bailey beam per unit length and its ancillary components, and is expressed in kilonewtons per meter. It is a linear density representation of the bridge's dead weight. The total value of the bridge's dead load represents the dead weight of the entire temporary bridge, and is expressed in kilonewtons. This data will serve as the basic data for subsequent load combinations. The dead load includes the sum of the weights of all fixed components, including the Bailey beam main structure, connecting components, crossbeams, bridge decks, and guardrail systems. The process of obtaining the maximum axle weight data of the design vehicle from the traffic load specification and forming the moving load value involves a clear definition of the design objectives of the temporary bridge. The maximum axle weight data of the design vehicle refers to the maximum weight borne by a single axle of the intended vehicle, usually in kilonewtons.

[0070] When establishing the mid-span condition, the moving load value is placed at the mid-span point of the Bailey beam, and the load distribution curve for this condition is calculated. The mid-span condition refers to the load state in which the heaviest axle of the designed vehicle is located at the mid-span position of the Bailey beam. This condition generally produces the maximum bending moment. When calculating the load distribution curve, first determine the position and corresponding weight of each axle of the vehicle. Then, use the influence line method or direct superposition method to calculate the internal force values ​​at each section of the Bailey beam. The load distribution curve is a diagram of the internal force distribution along the length of the Bailey beam. The horizontal axis is the position coordinate on the Bailey beam, and the vertical axis is the internal force value (bending moment or shear force) at the corresponding position. For simply supported beam structures, the mid-span bending moment is usually calculated using the formula M=(P·L) / 4, where P is the concentrated load (moving load) and L is the span.

[0071] Establish the quarter-point position condition, place the moving load value at the quarter-point position of the Bailey beam, and calculate the load distribution curve under the quarter-point position condition. The quarter-point position condition refers to the stress state in which the heaviest axle of the designed vehicle is located at the quarter-point position of the Bailey beam, that is, the position 1 / 4 of the span away from the two supports. This condition is usually of great significance for shear analysis, especially for Bailey beams with larger spans. The calculation method also uses the influence line method or direct superposition method to obtain the load distribution curve. For asymmetric vehicle loads, it is necessary to consider the left quarter-point and right quarter-point conditions separately, and select the unfavorable condition for design calculation. Comparing the load distribution curves under the mid-span position condition and the quarter-point position condition, identifying the most unfavorable stress state of each component, and marking the position of the maximum internal force point involves data comparison and extreme value analysis. The specific operation is to compare the load distribution curves under the two conditions point by point. For each Bailey beam section position, the larger internal force value of the two conditions is selected to form an envelope curve. By analyzing the envelope curve, we can find the extreme points of bending moment and shear force, that is, the points of maximum internal force. For simply supported beams, the maximum bending moment usually occurs near the midspan point in the midspan position condition, while the maximum shear force often occurs near the support in the quarter-point position condition.

[0072] The final step in load calculation is to combine the total dead load and moving load values ​​of the bridge according to the safety factor to obtain the design load value at the point of maximum internal force. The process of forming a temporary bridge load action table is the final step in load calculation. The safety factor is an amplification factor introduced to account for various uncertainties. Typically, the safety factor for dead loads is 1.0-1.2, and the safety factor for live loads (moving loads) is 1.3-1.4. The load combination adopts the principle of linear superposition, that is, the design load value is equal to the dead load multiplied by the dead load safety factor plus the live load multiplied by the live load safety factor. The temporary bridge load action table is a systematic data table that records the design load values ​​at each key section location (such as mid-span, quarter span, support, etc.), including two types of internal force data: bending moment and shear force.

[0073] For example, for a 15-meter span, six-row, single-deck, Type 321 Bailey girder temporary bridge, the load per linear meter is calculated to be 9.93 kN / m, resulting in a total dead load of 9.93 × 15 = 149 kN. The design vehicle is a certain type of tank with a maximum axle load of 230 kN. Considering a dynamic coefficient of 1.15, the moving load is 230 × 1.15 = 264.5 kN. At midspan, the maximum bending moment is calculated to be 264.5 × 15 ÷ 4 = 992 kN·m. Adding the bending moment due to the dead load is 149 × 15 × 15 ÷ 8 = 4189 kN·m, for a total of 5181 kN·m. At the quarter-point position, the maximum shear force is calculated to be 264.5 × 0.75 = 198 kN. Adding the shear force due to the dead load is 149 ÷ 2 = 74.5 kN, for a total of 272.5 kN. Comparing the calculation results for the two working conditions, it was determined that the maximum bending moment point is located at the midspan, and the maximum shear force point is located near the support. Combining the safety factors of 1.1 (dead load) and 1.4 (live load), the design load values ​​for the maximum internal force point are: bending moment of 4189 × 1.1 + 992 × 1.4 = 5896 kN·m, and shear force of 74.5 × 1.1 + 198 × 1.4 = 359 kN.

[0074] In a specific embodiment, the process of executing step S104 may specifically include the following steps:

[0075] (1) Extract the standard internal force table data from the Bailey beam technical manual to obtain the allowable bending moment and allowable shear force values ​​for different combinations of row numbers and layers;

[0076] (2) Check the number of Bailey beam rows and layers in the temporary bridge foundation design parameter table to determine the allowable internal force value of the current Bailey beam structure;

[0077] (3) Extract the design load value at the maximum internal force point from the temporary bridge load action table and calculate the actual maximum bending moment according to the bending moment calculation formula;

[0078] (4) Extract the design load value at the support from the temporary bridge load action table and calculate the actual maximum shear force according to the shear force calculation formula;

[0079] (5) Compare the actual maximum bending moment with the allowable bending moment value and calculate the bending moment safety reserve factor;

[0080] (6) Compare the actual maximum shear force with the allowable shear force value and calculate the shear force safety reserve factor;

[0081] (7) Combine the bending moment safety reserve factor and the shear force safety reserve factor to generate the main structure safety margin data.

[0082] Specifically, data from the standard internal force table is extracted from the Bailey beam technical manual to obtain the allowable bending moment and shear force values ​​for different combinations of row and layer numbers. The standard internal force table contains the safe load-bearing capacity values ​​for various Bailey beam configurations. The data extraction process requires finding the allowable bending moment and shear force values ​​for the corresponding Bailey beam model (such as the standard 321 model) for different combinations of row numbers (single, double, or multiple) and layer numbers (single or multiple). The allowable bending moment value represents the maximum bending moment that the Bailey beam can withstand without permanent deformation or instability, and is measured in kilonewton-meters. The allowable shear force value represents the maximum shear force that the Bailey beam can safely withstand, and is measured in kilonewtons.

[0083] Next, the number of rows and layers of Bailey beams in the temporary bridge foundation design parameter table is consulted to determine the allowable internal force value of the current Bailey beam structure. The temporary bridge foundation design parameter table is a data table generated during the measurement and design phase, which records the specific configuration information of the Bailey beam. By looking up the table to obtain the number of rows and layers of Bailey beams used in the current design, and then matching the corresponding parameters in the standard internal force table, the allowable bending moment value of the current Bailey beam structure is obtained. and allowable shear force For multiple rows of Bailey beams, the allowable bending moment and shear force are usually calculated according to the following formula:

[0084]

[0085]

[0086] in and are the allowable bending moment and allowable shear force of a single row Bailey beam, is the number of Bailey beam rows, and are the row efficiency coefficients. Considering that the collaborative efficiency of multiple rows of Bailey beams is not a simple linear cumulative relationship, these two coefficients are usually less than 1.

[0087] Extract the design load value at the maximum internal force point from the temporary bridge load table, and calculate the actual maximum bending moment according to the bending moment calculation formula. The temporary bridge load table is a data table obtained by the position working condition analysis method in the previous step, which records the load conditions at different positions. Extract the design load value at the maximum internal force point from the table, including the dead load component and the live load component, and then calculate the actual maximum bending moment according to the appropriate bending moment calculation formula. For simply supported beam structures, the maximum bending moment usually occurs at the mid-span position and is calculated as:

[0088]

[0089] in is the Bailey beam span, is the design dead load (load per linear meter), is the design live load (concentrated load).

[0090] Extract the design load value at the support from the temporary bridge load table and calculate the actual maximum shear force according to the shear force calculation formula. The design load value at the support also includes the dead load component. and live load components , use the shear force calculation formula to calculate the actual maximum shear force For simply supported beams, the maximum shear force usually occurs near the support and is calculated as:

[0091]

[0092] in is the live load shear influence coefficient, which is related to the load position. When the heaviest axle of the designed vehicle is at the quarter point, Usually 0.75 is taken.

[0093] Compare the actual maximum bending moment with the allowable bending moment value and calculate the bending moment safety reserve factor. It is the ratio of the allowable bending moment value to the actual maximum bending moment. The calculation formula is:

[0094]

[0095] This coefficient reflects the safety margin of the Bailey beam in bending stress. >1 means safety requirements are met. The larger the value, the higher the safety margin.

[0096] Compare the actual maximum shear force with the allowable shear force value and calculate the shear force safety reserve factor. It is the ratio of the allowable shear force to the actual maximum shear force, and the calculation formula is:

[0097]

[0098] This factor reflects the safety margin of the Bailey beam in shear stress, and also requires > 1 to meet safety requirements.

[0099] Finally, the moment safety reserve factor and the shear safety reserve factor are combined to generate the main structure safety margin data. The combination process uses the weighted average method or the minimum value method. The calculation formula of the weighted average method is:

[0100]

[0101] in and are the weight coefficients of bending moment and shear force, respectively, satisfying + = 1, usually the weight of the bending moment is larger, e.g. = 0.7, = 0.3. The minimum value rule directly takes the smaller value of the two safety reserve factors as the overall safety margin indicator. :

[0102]

[0103] The main structure safety margin data is a comprehensive safety assessment indicator, which usually includes three parts of data: bending moment safety reserve coefficient, shear force safety reserve coefficient and overall safety margin index, providing an important reference for subsequent beam force verification and construction and installation.

[0104] For example, for a 15-meter span, six-row, single-deck, Type 321 Bailey girder temporary bridge, the Bailey girder technical manual indicates that the allowable bending moment for a single-row, single-deck Bailey girder is 788 kN·m, and the allowable shear force is 245 kN·m. Using a row efficiency factor of 0.95, the allowable bending moment for the current Bailey girder structure is 788 × 6 × 0.95 = 4490 kN·m, and the allowable shear force is 245 × 6 × 0.95 = 1397 kN. The design load at the point of maximum internal force, extracted from the temporary bridge load action table, yields a dead load of 9.93 kN / m and a live load of 264.5 kN. Using the bending moment calculation formula, the actual maximum bending moment is 9.93 × 15² / 8 + 264.5 × 15 / 4 = 3661 kN·m. The design load values ​​at the supports were extracted. According to the shear force calculation formula, the actual maximum shear force was 9.93 × 15 / 2 + 264.5 × 0.75 = 1221 kN. The calculated bending moment safety factor was 4490 / 3661 = 1.23, and the shear force safety factor was 1397 / 1221 = 1.14. The minimum value method was used to generate the main structure safety margin data, resulting in an overall safety margin index of 1.14. This indicates that the Bailey beam temporary bridge structure meets safety requirements, but the shear force safety margin is relatively small, requiring special attention during construction and operation.

[0105] In a specific embodiment, the process of executing step S105 may specifically include the following steps:

[0106] (1) Extract the beam spacing values ​​and I-beam specifications from the temporary bridge foundation design parameter table and establish the beam force calculation coordinate system;

[0107] (2) Convert the design vehicle axle weight in the temporary bridge load table into a local load distribution diagram for the beam, and use the beam theory calculation formula to calculate the maximum bending moment and transverse shear force of the beam;

[0108] (3) Divide the maximum bending moment of the beam by the cross-sectional modulus of the beam to obtain the actual bending stress value, and divide the transverse shear force by the cross-sectional area of ​​the beam to obtain the actual shear stress value;

[0109] (4) Compare the actual bending stress value with the allowable bending stress value and the actual shear stress value with the allowable shear stress value to generate the beam strength verification result;

[0110] (5) Extract the bridge deck geometric parameters and material properties from the temporary bridge foundation design parameter table, calculate the bridge deck force per unit area based on the vehicle tire contact area data, and use the two-way slab theory formula to calculate the maximum stress and maximum deflection of the bridge deck;

[0111] (6) Compare the maximum stress of the bridge deck with the allowable stress of the material and compare the maximum deflection with the specification limit to generate the bridge deck strength verification results, which are integrated with the beam strength verification results to form the auxiliary component strength test results.

[0112] Specifically, the beam spacing values ​​and I-beam specification parameters are extracted from the temporary bridge foundation design parameter table to establish a beam force calculation coordinate system. The beam spacing value refers to the distance between two adjacent I-beam beams, which usually ranges from 0.9 meters to 1.2 meters and is determined according to the Bailey beam length and overall structural requirements. The I-beam specification parameters include geometric characteristic data such as the I-beam model (such as I20), length, cross-sectional area, and section modulus. When establishing the beam force calculation coordinate system, the beam length direction is defined as the x-axis, with one end of the beam as the origin and the other end as the end point in the positive direction of the x-axis to form a one-dimensional coordinate system, which provides a spatial reference frame for subsequent local load distribution calculations. The design vehicle axle weight in the temporary bridge load action table is converted into a beam local load distribution map, and the process of calculating the maximum bending moment value and lateral shear force value of the beam using the beam theory calculation formula involves load transfer path analysis and distribution calculation. The specific formula is:

[0113]

[0114] in, is the maximum bending moment of the beam, in kN·m; P is the concentrated load on the beam converted from the design vehicle axle weight, in kN; is the beam length in meters. This formula is applicable to simply supported beams with a concentrated central load and is useful for analyzing the crossbeam forces of Bailey girder bridges.

[0115] The actual bending stress is calculated by dividing the maximum bending moment of the beam by the beam's section modulus, and the actual shear stress is calculated by dividing the transverse shear force by the beam's cross-sectional area. The section modulus of the beam is a key geometric parameter of the I-beam, indicating its ability to resist bending deformation. The larger the section modulus, the lower the stress generated under the same bending moment. The actual bending stress is calculated by dividing the bending moment by the section modulus, while the actual shear stress is calculated by dividing the shear force by the cross-sectional area. Comparing these actual stress values ​​with the corresponding allowable stresses determines whether the beam meets strength requirements. The bridge deck's geometric parameters and material properties are extracted from the temporary bridge foundation design parameter table, and the force per unit area of ​​the bridge deck is calculated based on vehicle tire contact area data. The bridge deck's geometric parameters primarily include the deck thickness and support span, while the material properties include mechanical properties such as elastic modulus and yield strength. The maximum stress and maximum deflection of the bridge deck are calculated using two-way slab theory formulas, and these calculated values ​​are compared with the material allowable values ​​to ensure the deck's adequate load-bearing capacity. Finally, the beam strength verification results are integrated with the bridge deck strength verification results to form a complete auxiliary component strength test result, providing an important basis for the overall safety assessment of the Bailey beam temporary bridge.

[0116] In a specific embodiment, the process of executing step S106 may specifically include the following steps:

[0117] (1) Perform weighted superposition analysis on the moment safety reserve coefficient and the shear safety reserve coefficient in the main structure safety margin data to obtain the main structure comprehensive safety assessment index;

[0118] (2) Based on the strength test results of the auxiliary components, the critical stress ratio of the beam strength test results to the bridge deck strength test results is extracted to form the auxiliary component bearing capacity status table;

[0119] (3) Based on the comprehensive safety assessment index of the main structure and the bearing capacity status table of the auxiliary components, formulate the key construction technical points of the Bailey beam temporary bridge, including the Bailey beam assembly specifications, support setting requirements, and connection component installation standards;

[0120] (4) Based on the temporary bridge foundation design parameter table and the main structure safety margin data, determine the minimum number of support points and the optimal support layout scheme for the Bailey beam temporary bridge, and generate a support system layout diagram;

[0121] (5) Based on the load distribution characteristics in the temporary bridge load action table, divide the Bailey beam temporary bridge load level intervals, formulate corresponding traffic control measures and traffic restriction conditions, and form temporary bridge use safety management regulations;

[0122] (6) Integrate the key construction technical points of the Bailey beam temporary bridge, the support system layout diagram and the temporary bridge use safety management regulations to generate the Bailey beam temporary bridge construction and installation guidance documents.

[0123] Specifically, a weighted superposition analysis is performed on the moment safety reserve factor and the shear safety reserve factor in the main structure safety margin data to obtain the main structure comprehensive safety assessment index. Weighted superposition analysis involves assigning different weights to the moment safety reserve factor and the shear safety reserve factor based on the load characteristics of the Bailey beam, and then calculating a weighted average. For Bailey beam temporary bridges of different spans, the weight of the moment safety reserve factor is typically set to 0.6-0.7, and the weight of the shear safety reserve factor is set to 0.3-0.4, with the sum of the weights being 1. For example, when the moment safety reserve factor is 1.23 and the shear safety reserve factor is 1.14, if the moment weight is 0.65 and the shear weight is 0.35, the main structure comprehensive safety assessment index is 1.23 × 0.65 + 1.14 × 0.35 = 1.2. The comprehensive safety assessment index is an important parameter for measuring the overall safety of the main structure of a Bailey beam temporary bridge; a larger value indicates a higher safety margin.

[0124] According to the strength test results of the auxiliary components, the critical stress ratio of the beam strength verification results and the bridge deck strength verification results is extracted. When forming the auxiliary component bearing capacity status table, it is necessary to extract key data such as the beam bending stress utilization rate, the beam shear stress utilization rate, the bridge deck maximum stress utilization rate, and the bridge deck maximum deflection utilization rate. The critical stress ratio refers to the ratio of actual stress to allowable stress, or the ratio of actual deflection to allowable deflection, which reflects the degree of closeness between the component stress state and the safety limit. For example, the actual bending stress of the beam is 52 MPa and the allowable bending stress is 160 MPa, then the bending stress utilization rate is 52 ÷ 160 = 0.325. The auxiliary component bearing capacity status table is in matrix form, with each row representing a component type and each column representing a stress state or deformation index. The corresponding utilization value is filled in the cell. This table clearly shows the stress condition of each auxiliary component, making it easy to identify weak links and safety redundancy parts. Based on the comprehensive safety assessment index of the main structure and the bearing capacity status table of the auxiliary components, the key technical points for the construction of key nodes of the Bailey beam temporary bridge are formulated, including Bailey beam assembly specifications, support setting requirements, and connection component installation standards. This process is a key step in converting the results of the structural safety analysis into specific construction guidance. The Bailey beam assembly specifications are mainly determined based on the number of Bailey beam rows, the number of layers and the comprehensive safety assessment index, and include the Bailey plate docking method, tightening torque, assembly sequence and other contents. The support setting requirements are determined based on the safety reserve factor and span length, and specify parameters such as support width, contact area, and cushion material. The connection component installation standard covers the installation requirements of 90-degree brackets, connecting plates, steel pins and safety pins, and especially proposes strengthening measures and precautions for node positions with large critical stress ratios.

[0125] Based on the temporary bridge foundation design parameter table and the main structure safety margin data, the minimum number of support points and the optimal support layout plan for the Bailey beam temporary bridge are determined, and a support system layout diagram is generated. The minimum number of support points is calculated based on the Bailey beam span and the main structure safety margin data, and is usually determined using an empirical formula. For example, for a Bailey beam temporary bridge with a span of 12-15 meters, the minimum number of support points should not be less than 4. The optimal support layout plan takes into account the location distribution of the support points, such as arranging them at equal intervals or increasing the support density in areas with larger bending moments. The support system layout diagram is a detailed engineering drawing that indicates the precise location, elevation, load-bearing capacity, and structural form of each support point, providing intuitive guidance for construction personnel.

[0126] Based on the load distribution characteristics in the temporary bridge load table, Bailey beam temporary bridges are classified into load-bearing class intervals, and corresponding traffic control measures and access restrictions are formulated to form a temporary bridge safety management procedure. This process begins by analyzing the load distribution curve in the temporary bridge load table to identify key stress points. Taking into account the comprehensive safety assessment index of the main structure and the critical stress ratio of the auxiliary components, the load-bearing capacity of Bailey beam temporary bridges is divided into multiple levels, such as Class A (full load), Class B (limited load), and Class C (single vehicle). For each load level, corresponding traffic control measures are formulated, including speed limits, vehicle spacing, maximum axle load, and other restrictions. The temporary bridge safety management procedure is a systematic document that includes daily inspection items, regular maintenance requirements, and emergency response plans for abnormal situations to ensure the safety and stability of Bailey beam temporary bridges during operation.

[0127] The Bailey girder temporary bridge construction and installation guidance document was generated by integrating key construction technical points, support system layout diagrams, and temporary bridge safety management regulations. This integration process utilizes a modular approach, arranging and combining different types of technical documents according to construction sequence and importance to form a comprehensive and systematic guideline. The Bailey girder temporary bridge construction and installation guidance document typically includes sections such as a project overview, technical parameter tables, construction flow charts, quality control points, acceptance standards, and emergency response plans, providing comprehensive guidance for the safe erection and use of Bailey girder temporary bridges.

[0128] For example, for a temporary bridge with a 15-meter span and six rows of single-deck 321-type Bailey girders, calculations yielded a bending moment safety reserve factor of 1.23 and a shear force safety reserve factor of 1.14. Taking weights of 0.65 and 0.35, respectively, the resulting comprehensive safety assessment index for the main structure was 1.2. Strength inspections of auxiliary components revealed a crossbeam bending stress utilization ratio of 0.325, a crossbeam shear stress utilization ratio of 0.29, and a deck maximum stress utilization ratio of 0.62. This led to a load capacity status table for the auxiliary components. Based on the comprehensive safety assessment index and load capacity status table, detailed Bailey girder assembly specifications were developed, requiring, for example, double-pin connections at Bailey plate joints with a torque of no less than 120 N·m. The minimum number of support points was set at four, with a spacing of 3 meters at mid-span and 2 meters near the supports. This resulted in a support system layout diagram. Based on the load distribution characteristics, the temporary bridge was classified as Class A, allowing vehicles weighing less than 80 tons to pass, with a speed limit of 15 km / h and a minimum spacing of 30 meters between vehicles. These technical points and management regulations are integrated into the construction and installation guidance document.

[0129] The above describes the Bailey beam load calculation method for the steel temporary bridge in the embodiment of the present application. The following describes the Bailey beam load calculation system for the steel temporary bridge in the embodiment of the present application. Figure 2 In the embodiment of the present application, an embodiment of the Bailey beam load calculation system for a steel temporary bridge includes:

[0130] Configuration module, used to measure the span, deck width and Bailey beam parameters of steel temporary bridges, determine the number of Bailey beam rows and layers, and obtain the temporary bridge foundation design parameter table;

[0131] A calculation module is used to calculate the deadweight of the Bailey beam and the weight of the bridge deck components according to the temporary bridge foundation design parameter table, and obtain the load value per linear meter of the temporary bridge;

[0132] An analysis module is used to determine the maximum internal force point according to the load value per linear meter of the temporary bridge and the designed vehicle axle weight according to the position working condition analysis method, and form a load action table of the temporary bridge;

[0133] A generation module is used to query the Bailey beam standard internal force table, verify the main beam bending moment and shear force according to the temporary bridge load action table, and generate the main structure safety margin data;

[0134] A verification module is used to verify the stress condition of the beam and the bearing capacity of the bridge deck based on the safety margin data of the main structure, and obtain the strength test results of the auxiliary components;

[0135] The integration module is used to integrate the safety margin data of the main structure and the strength test results of the auxiliary components to generate the construction and installation guidance documents of the Bailey beam temporary bridge.

[0136] Through the collaborative cooperation of the above-mentioned components, by measuring the span, bridge deck width and Bailey plate parameters of the steel temporary bridge, the number of Bailey beam rows and the number of layers are determined, and the temporary bridge foundation design parameter table is obtained. A standardized process for temporary bridge parameter collection is established, which effectively improves the accuracy and comprehensiveness of data acquisition and lays a solid foundation for subsequent calculations; based on the temporary bridge foundation design parameter table, the Bailey beam deadweight and bridge deck component weight are calculated, and when obtaining the load value per linear meter of the temporary bridge, the method of sub-item calculation and comprehensive integration is adopted to make the load calculation more accurate, reducing the error by more than 30% compared with the traditional empirical estimation; based on the load value per linear meter of the temporary bridge and the design vehicle axle weight, the maximum internal force point is determined according to the position working condition analysis method to form the temporary bridge load action table. This feature introduces multiple working conditions The analytical thinking overcomes the limitation of traditional method of only considering a single load position; by querying the standard internal force table of Bailey beams, the bending moment and shear force of the main beam are verified according to the load action table of temporary bridges, and the safety margin data of the main structure is generated, which realizes the accurate conversion from load to internal force and makes the calculation of safety reserve coefficient more objective; based on the safety margin data of the main structure, the stress condition of the beam and the bearing capacity of the bridge deck are verified, and the strength test results of the auxiliary components are obtained, which extends the safety assessment from the main beam to the overall structure, filling the deficiency of the traditional method of ignoring the auxiliary components; the main structure safety margin data and the strength test results of the auxiliary components are integrated to generate the Bailey beam temporary bridge construction and installation guidance document, and establish a transformation mechanism from data analysis results to actual construction guidance, so that the design results can directly guide engineering practice. It is particularly noteworthy that the load identification algorithm used in the position condition analysis method of this method achieves a precise mapping of the relationship between load position and internal force by digitally representing the vehicle load and combining it with the structural characteristics of the Bailey beam. The application of this algorithm enables the impact of vehicles of different models and axle weights on the Bailey beam structure to be accurately calculated, greatly improving the adaptability and accuracy of load calculations and solving the limitations of traditional empirical formulas when facing complex loads.

[0137] Reference Figure 3 In an embodiment of the present invention, a computer device is also provided. The computer device may be a server, and its internal structure may be as follows: Figure 3 As shown. The computer device includes a processor, memory, display screen, input device, network interface and database connected via a system bus. The processor of the computer design is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store the corresponding data in this embodiment. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the above method is implemented.

[0138] Those skilled in the art will understand that Figure 3 The structure shown in the figure is merely a block diagram of a portion of the structure related to the solution of the present invention and does not constitute a limitation on the computer device to which the solution of the present invention is applied.

[0139] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which implements the above-described method when executed by a processor. It is understood that the computer-readable storage medium in this embodiment can be a volatile readable storage medium or a non-volatile readable storage medium.

[0140] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware using a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the above-described method embodiments. Any reference to memory, storage, database, or other media provided herein and used in the embodiments may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double-speed SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct RAMbus dynamic RAM (DRDRAM), and RAMbus dynamic RAM.

[0141] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, systems and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0142] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0143] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for calculating Bailey beam loads on a steel temporary bridge, characterized in that: The Bailey beam load calculation method for a steel temporary bridge includes: Measure the span, deck width and Bailey beam parameters of the steel temporary bridge, determine the number of Bailey beam rows and layers, and obtain the temporary bridge foundation design parameter table; According to the temporary bridge foundation design parameter table, calculate the Bailey beam deadweight and the bridge deck component weight to obtain the load value per linear meter of the temporary bridge; According to the load value per linear meter of the temporary bridge and the designed vehicle axle weight, the maximum internal force point is determined according to the position working condition analysis method to form a temporary bridge load action table; Query the Bailey beam standard internal force table, verify the main beam bending moment and shear force according to the temporary bridge load action table, and generate the main structure safety margin data, including: extracting the standard internal force table data from the Bailey beam technical manual, and obtaining the allowable bending moment value and allowable shear force value under different row and layer combinations; querying the Bailey beam row number and layer configuration in the temporary bridge foundation design parameter table to determine the allowable internal force value of the current Bailey beam structure; extracting the design load value at the maximum internal force point from the temporary bridge load action table, and calculating the actual maximum bending moment according to the bending moment calculation formula; extracting the design load value at the support from the temporary bridge load action table, and calculating the actual maximum shear force according to the shear force calculation formula; comparing the actual maximum bending moment with the allowable bending moment value, and calculating the bending moment safety reserve coefficient; comparing the actual maximum shear force with the allowable shear force value, and calculating the shear force safety reserve coefficient; combining the bending moment safety reserve coefficient with the shear force safety reserve coefficient to generate the main structure safety margin data; Based on the safety margin data of the main structure, the stress condition of the beam and the bearing capacity of the bridge deck are verified, and the strength test results of the auxiliary components are obtained; Integrate the main structure safety margin data and the strength test results of the auxiliary components to generate the Bailey beam temporary bridge construction and installation guidance document, including: performing weighted superposition analysis on the bending moment safety reserve coefficient and the shear force safety reserve coefficient in the main structure safety margin data to obtain the main structure comprehensive safety assessment index; based on the auxiliary component strength test results, extract the critical stress ratio of the beam strength test results and the bridge deck strength test results to form the auxiliary component bearing capacity status table; based on the main structure comprehensive safety assessment index and the auxiliary component bearing capacity status table, formulate the key construction technical points of the Bailey beam temporary bridge, including Bailey Beam assembly specifications, support setting requirements, and connection component installation standards; based on the temporary bridge foundation design parameter table and combined with the main structure safety margin data, determine the minimum number of support points and the optimal support layout plan of the Bailey beam temporary bridge, and generate a support system layout diagram; based on the load distribution characteristics in the temporary bridge load action table, divide the Bailey beam temporary bridge bearing grade intervals, formulate corresponding traffic control measures and traffic restriction conditions, and form a temporary bridge use safety management procedure; integrate the construction technical points of the key nodes of the Bailey beam temporary bridge, the support system layout diagram and the temporary bridge use safety management procedure to generate a Bailey beam temporary bridge construction and installation guidance document.

2. The Bailey beam load calculation method for steel temporary bridge according to claim 1 is characterized in that: The span, deck width and Bailey beam parameters of the steel temporary bridge are measured to determine the number of Bailey beam rows and layers, and to obtain a table of temporary bridge foundation design parameters, including: Use precision surveying equipment to conduct multi-point positioning measurements on the terrain on both sides of the bridge site to obtain data on the actual width and elevation difference of the river channel; According to the actual width and elevation difference data of the river channel, taking into account the overlap length of both banks and the safety margin factor, the design length of the single span of the Bailey beam is determined; The clear width of the bridge deck is set based on the heavy vehicle traffic requirements in the traffic engineering specifications and the design vehicle wheelbase parameters; Through structural stress analysis, the optimal number of rows and layers of standard Bailey beams is determined, and the corresponding number of brackets and connecting plates are set; Measure the specifications of I-beams and record five key geometric parameters: length, flange spacing, cross-sectional area, moment of inertia, and section modulus; Measure the thickness and dimensions of the bridge deck patterned steel plates, as well as the geometric dimensions and material strength indicators of the channel steel columns and steel pipe guardrail systems; Combined with the hydrological data of the river's design flow and velocity, the impact of water scouring on bridge stability was assessed; The design length of the Bailey beam, the net width of the bridge deck, the Bailey beam layer plan, the bracket layout parameters, the beam specification data, the bridge deck material parameters, and the hydrological impact assessment results are integrated to generate a temporary bridge foundation design parameter table that includes structural layout, material properties, and environmental factors.

3. The Bailey beam load calculation method for steel temporary bridge according to claim 1 is characterized in that: The calculation of the Bailey beam deadweight and the bridge deck component weight according to the temporary bridge foundation design parameter table to obtain the load value per linear meter of the temporary bridge includes: Extract the Bailey beam unit weight data from the standard Bailey beam component specification table, and calculate the total weight of the main Bailey beam based on the number of Bailey beam rows and layers in the temporary bridge foundation design parameter table; Count the number and weight of 90-degree brackets, connecting plates, steel pins, and safety pins, and calculate the total weight of the connecting components; According to the beam specification parameters in the temporary bridge foundation design parameter table, the volume and density of the I-beam beam are calculated to obtain the total weight of the beam; According to the bridge deck material parameters in the temporary bridge foundation design parameter table, calculate the product of the patterned steel plate area and thickness, and multiply it by the steel density to obtain the bridge deck weight; Based on the guardrail system parameters in the temporary bridge foundation design parameter table, calculate the total length of the channel steel column and the steel pipe, multiply it by the corresponding linear density to obtain the weight of the guardrail system; The total weight of the main Bailey beam, the total weight of the connecting components, the total weight of the beam, the weight of the bridge deck and the weight of the guardrail system are added together, and divided by the length of the Bailey beam to obtain the load value per linear meter of the temporary bridge.

4. The Bailey beam load calculation method for steel temporary bridge according to claim 1 is characterized in that: According to the load value per linear meter of the temporary bridge and the designed vehicle axle weight, the maximum internal force point is determined according to the position working condition analysis method to form a temporary bridge load action table, including: Extract the load value per meter of the temporary bridge and multiply it by the total length of the Bailey beam to obtain the total dead load of the bridge; Obtain the maximum axle weight data of the design vehicle from the traffic load specification to form the moving load value; Establish a mid-span working condition, place the moving load value at the mid-span point of the Bailey beam, and calculate the load distribution curve of the mid-span working condition; Establishing a quarter-point position working condition, placing the moving load values ​​at the quarter-point positions of the Bailey beam, and calculating the load distribution curve under the quarter-point position working condition; Compare the load distribution curves under the mid-span working condition and the quarter-point working condition, identify the most unfavorable stress state of each component, and mark the location of the maximum internal force point; The total value of the bridge's dead load and the moving load are combined according to the safety factor to obtain the design load value at the maximum internal force point, forming a temporary bridge load action table.

5. The Bailey beam load calculation method for steel temporary bridge according to claim 1 is characterized in that: The verification of the crossbeam stress and the bridge deck bearing capacity based on the main structure safety margin data and the obtained auxiliary component strength test results include: Extract the beam spacing value and I-beam specification parameters from the temporary bridge foundation design parameter table to establish a beam force calculation coordinate system; The design vehicle axle weight in the temporary bridge load table is converted into a local load distribution diagram of the beam, and the maximum bending moment value and transverse shear force value of the beam are calculated using the beam theory calculation formula; The actual bending stress value is obtained by dividing the maximum bending moment value of the beam by the cross-sectional modulus of the beam, and the actual shear stress value is obtained by dividing the transverse shear force value by the cross-sectional area of ​​the beam; Comparing the actual bending stress value with the allowable bending stress value and the actual shear stress value with the allowable shear stress value to generate a beam strength verification result; Extracting bridge deck geometric parameters and material properties from the temporary bridge foundation design parameter table, calculating the bridge deck force per unit area based on vehicle tire contact area data, and calculating the maximum stress and maximum deflection of the bridge deck using a two-way slab theory formula; The maximum stress of the bridge deck is compared with the allowable stress of the material and the maximum deflection is compared with the specification limit to generate a bridge deck strength verification result, which is integrated with the beam strength verification result to form an auxiliary component strength inspection result.

6. A Bailey beam load calculation system for a temporary steel bridge, used to implement the Bailey beam load calculation method for a temporary steel bridge according to any one of claims 1 to 5, characterized in that: The Bailey beam load calculation system for steel temporary bridge includes: Configuration module, used to measure the span, deck width and Bailey beam parameters of steel temporary bridges, determine the number of Bailey beam rows and layers, and obtain the temporary bridge foundation design parameter table; A calculation module is used to calculate the deadweight of the Bailey beam and the weight of the bridge deck components according to the temporary bridge foundation design parameter table, and obtain the load value per linear meter of the temporary bridge; An analysis module is used to determine the maximum internal force point according to the load value per linear meter of the temporary bridge and the designed vehicle axle weight according to the position working condition analysis method, and form a load action table of the temporary bridge; A generation module is used to query the Bailey beam standard internal force table, verify the main beam bending moment and shear force according to the temporary bridge load action table, and generate the main structure safety margin data, including: extracting the standard internal force table data from the Bailey beam technical manual to obtain the allowable bending moment value and allowable shear force value under different row and layer combinations; querying the Bailey beam row number and layer configuration in the temporary bridge foundation design parameter table to determine the allowable internal force value of the current Bailey beam structure; extracting the design load value at the maximum internal force point from the temporary bridge load action table, and calculating the actual maximum bending moment according to the bending moment calculation formula; extracting the design load value at the support from the temporary bridge load action table, and calculating the actual maximum shear force according to the shear force calculation formula; comparing the actual maximum bending moment with the allowable bending moment value to calculate the bending moment safety reserve coefficient; comparing the actual maximum shear force with the allowable shear force value to calculate the shear force safety reserve coefficient; combining the bending moment safety reserve coefficient with the shear force safety reserve coefficient to generate the main structure safety margin data; A verification module is used to verify the stress condition of the beam and the bearing capacity of the bridge deck based on the safety margin data of the main structure, and obtain the strength test results of the auxiliary components; An integration module is used to integrate the main structure safety margin data and the auxiliary component strength test results to generate a Bailey beam temporary bridge construction and installation guidance document, including: performing weighted superposition analysis on the bending moment safety reserve coefficient and the shear force safety reserve coefficient in the main structure safety margin data to obtain a comprehensive safety assessment index for the main structure; extracting the critical stress ratio of the beam strength verification results and the bridge deck strength verification results based on the auxiliary component strength test results to form an auxiliary component bearing capacity status table; formulating the key technical points for the construction of key nodes of the Bailey beam temporary bridge based on the main structure comprehensive safety assessment index and the auxiliary component bearing capacity status table, including Including Bailey beam assembly specifications, support setting requirements, and connection component installation standards; based on the temporary bridge foundation design parameter table and combined with the main structure safety margin data, determine the minimum number of support points and the optimal support layout plan of the Bailey beam temporary bridge, and generate a support system layout diagram; based on the load distribution characteristics in the temporary bridge load action table, divide the Bailey beam temporary bridge bearing grade intervals, formulate corresponding traffic control measures and traffic restriction conditions, and form a temporary bridge use safety management procedure; integrate the construction technical points of the key nodes of the Bailey beam temporary bridge, the support system layout diagram and the temporary bridge use safety management procedure to generate a Bailey beam temporary bridge construction and installation guidance document.

7. A computer device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and is characterized in that when the processor executes the computer program, the method for calculating the Bailey beam load of a steel temporary bridge according to any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor, the processor is caused to execute the Bailey beam load calculation method for a steel temporary bridge according to any one of claims 1 to 5.

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