Bridge high pier construction safety assessment method and system based on material stress analysis

Abstract

The invention discloses a bridge high pier construction safety assessment method and system based on material stress analysis, and relates to the field of safety assessment, and the method comprises the steps: determining a construction environment load according to real-time construction environment information and construction weather prediction information; determining a dynamic safety index according to construction historical data of high piers of the same type; generating a construction risk value in combination with the construction environment load; according to information of equipment used for bridge high pier construction, the load of construction equipment is determined; based on stress analysis software, generating bridge high pier stress data, and predicting structure change information of the to-be-constructed bridge high pier; setting safety parameters; according to the construction progress information and the safety parameters of the current bridge high pier, the deviation degree of the bridge high pier is obtained; comparing the real-time construction environment information with the construction weather prediction information, and generating a weather correction coefficient of the current construction project; and evaluating the construction safety by combining the construction risk value, the bridge high pier deviation degree and the weather correction coefficient of the current construction project.

Description

Technical Field

[0001] The present invention relates to the field of safety assessment, and in particular to a method and system for safety assessment of high bridge pier construction based on material stress analysis. Background Art

[0002] A bridge pier refers to a vertical column used to support the main structure of a bridge, usually located below or above the bridge deck. The structural forms of bridge piers vary, depending on the type of bridge and geological conditions. Material stress analysis is an analysis method that obtains the internal stress distribution law through the external load of the material. When the material is subjected to external forces, it will generate internal forces to resist the deformation caused by such external forces.

[0003] In terms of data collection for traditional high pier construction of bridges, usually only basic data such as concrete test block strength and foundation bearing capacity are collected, while data related to the construction environment is ignored, resulting in a large difference between the predicted construction period and the actual construction period, increasing the risk in the construction process. Safety assessments of high piers of bridges often focus on the strength and stability of the structure, ignoring the deformation of the high piers of bridges during construction, and failing to fully consider the differences in the impact of the environment on different construction processes, resulting in insufficient accuracy of the assessment results, and being unable to fully reflect the complexity and risks in high pier construction, which in turn leads to the inability to timely discover potential safety hazards during the construction process. Summary of the invention

[0004] In order to solve the above technical problems, a method and system for safety assessment of high bridge pier construction based on material stress analysis is provided. This technical solution solves the problem that the data related to the construction environment is ignored in the above background technology, resulting in a large difference between the predicted construction period and the actual one, increasing the risk in the construction process, ignoring the deformation of the high bridge pier during the construction process, failing to fully consider the difference in the impact of the environment on different construction processes, resulting in insufficient accuracy of the assessment results, and failing to fully reflect the complexity and risk in the high pier construction.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A method for safety assessment of high bridge pier construction based on material stress analysis, comprising:

[0007] Obtain real-time construction environment information and construction weather forecast information to determine the construction environment load;

[0008] Obtain the historical records of high pier construction of the same type of bridges and the terrain undulation characteristics data of high pier construction, establish a terrain risk characteristic parameter table, and determine the dynamic safety index;

[0009] Generate construction risk value based on dynamic safety index and construction weather forecast information combined with construction environmental load;

[0010] Obtain and analyze bridge design plans and determine the equipment and material information used in the construction of bridge piers;

[0011] Determine the load of construction equipment based on the equipment information used in the construction of high bridge piers;

[0012] Based on the stress analysis software, the construction environment load, construction equipment load and material information used in the construction of bridge piers are input to perform material stress analysis on bridge piers, generate bridge pier stress data and predict the structural change information of bridge piers to be constructed;

[0013] Set safety parameters based on the stress data of the bridge piers and the structural change information of the bridge piers to be constructed;

[0014] Obtain the current construction progress information of the bridge pier, compare the safety parameters, and obtain the deviation of the bridge pier;

[0015] Compare the real-time construction environment information and construction weather forecast information, and combine the current bridge pier construction progress information to generate the weather correction coefficient for the current construction project;

[0016] The construction safety level is evaluated by combining the construction risk value, the deviation of the bridge high pier and the weather correction factor of the current construction project.

[0017] Preferably, the determining of the construction environment load specifically includes:

[0018] Collect meteorological data from the meteorological bureau where the bridge construction site is located to determine the long-term meteorological fluctuation pattern in the area where the bridge construction site is located;

[0019] Use total station to conduct topographic survey and obtain topographic information of the construction site and surrounding areas;

[0020] Establish a meteorological observation station based on the topographic information of the construction site and surrounding areas;

[0021] Generate construction weather forecast information based on the long-term meteorological fluctuation patterns and real-time construction environment information of the bridge construction area;

[0022] Set up water level observation holes around the construction site and regularly record water level data around the construction site;

[0023] Obtain soil samples from the construction site and obtain physical information of the soil at the construction site;

[0024] Generate soil permeability data based on water level data around the construction site and physical information of the soil at the construction site;

[0025] According to the bridge design plan, determine the height of the bridge pier and obtain the wind load of the bridge pier;

[0026] Generate predicted soil moisture at the construction site based on construction weather forecast information and water level data around the construction site, and obtain soil load at the construction site in combination with soil permeability data;

[0027] The wind load on the high piers of the bridge and the soil load at the construction site are collectively referred to as construction environment loads.

[0028] Preferably, the determining of the dynamic safety index specifically includes:

[0029] Classify construction weather forecast information and generate meteorological element classification data;

[0030] According to the meteorological element classification data, the high pier construction history records are classified and processed to generate the same meteorological element construction history data;

[0031] Classify the historical data of construction with the same meteorological elements according to the construction type, and generate historical data of meteorological elements of the construction type;

[0032] Summarize the historical data of meteorological elements of construction types, summarize the corresponding environmental characteristic data when each construction type stops construction, and record it as the risk characteristic threshold;

[0033] Generate the time-varying coefficient of meteorological construction risk based on the meteorological element classification data and the historical records of high pier construction;

[0034] Based on the construction weather forecast information, obtain the predicted time when the meteorological data reaches the risk characteristic threshold;

[0035] According to the predicted time when the meteorological data reaches the risk characteristic threshold, the meteorological construction risk time-varying coefficient is accumulated to generate the predicted risk value;

[0036] Combined with the terrain undulation characteristic data of each high pier construction site and the risk characteristic threshold of each construction type, a terrain risk characteristic parameter table is established;

[0037] According to the terrain information of the construction site and the surrounding area, the terrain risk characteristic parameter table is retrieved to obtain the risk characteristic threshold corresponding to the current construction terrain as a dynamic safety indicator.

[0038] Preferably, generating the construction risk value specifically includes:

[0039] According to the real-time construction environment information, the real-time wind direction and wind speed of the bridge piers are determined, and the real-time wind load of the bridge piers is generated;

[0040] Based on the terrain risk characteristic parameter table, determine the wind load characteristic threshold and soil load characteristic threshold;

[0041] According to the wind load characteristic threshold, determine the wind direction and wind speed corresponding to the wind load characteristic threshold, and obtain the predicted time of reaching the wind load characteristic threshold in combination with the construction weather forecast information;

[0042] Collect the current construction progress, obtain the current construction progress based on the historical records of high pier construction, and generate a predicted completion time;

[0043] According to the soil load characteristic threshold, determining the corresponding humidity of the soil load characteristic threshold;

[0044] Combine the water level data around the construction site and the construction weather forecast information to obtain the corresponding humidity prediction time when the soil load characteristic threshold is reached;

[0045] The construction risk value is generated by combining the predicted time to reach the wind load characteristic threshold, the predicted completion time and the corresponding moisture prediction time to reach the soil load characteristic threshold;

[0046] The specific calculation formula of the construction risk value is:

[0047]

[0048] Where P1 represents the construction risk value, α represents the predicted risk value of soil load construction, β represents the predicted risk value of wind load construction, a represents the current construction progress, e represents the natural constant, T2 represents the predicted completion time, T3 represents the corresponding humidity predicted time to reach the soil load characteristic threshold, and T1 represents the predicted time to reach the wind load characteristic threshold.

[0049] Preferably, generating the stress data of the high pier of the bridge and predicting the structural change information of the high pier of the bridge to be constructed specifically includes:

[0050] According to the bridge design plan, determine the shape and size of the expected bridge piers, create a geometric model in the stress analysis software, and mark the geometric parameters;

[0051] According to the material information used in the construction of high bridge piers, select the appropriate material model in the software and mark the elastic modulus of the material model;

[0052] According to the structural geometric characteristics of the bridge piers, the geometric model is divided to generate stress analysis areas;

[0053] Input the construction environment load and construction equipment load into the stress analysis software to generate the load vector of the stress analysis area;

[0054] According to the elastic modulus of the material model in the stress analysis area, the initial tangent stiffness matrix is ​​established;

[0055] Combining the initial tangent stiffness matrix and the load vectors of each pair of stress analysis areas, the unbalanced force vector and the number of unbalanced forces in the stress analysis area are generated, and the unbalanced force vector and the number of forces in the stress analysis area are collectively referred to as the bridge high pier stress data;

[0056] Set an initial displacement vector, combine it with the unbalanced force vector in the stress analysis area, iterate, update the displacement vector, obtain the updated displacement vector of each iteration, and predict the structural change information of the high pier of the bridge to be constructed;

[0057] Among them, the specific calculation formula of the unbalanced force vector is:

[0058] {R i}={F}-[K T (δ i )]{δ i};

[0059] In the formula, {R i} represents the unbalanced force vector of the i-th iteration, {F} represents the load vector of the stress analysis area, [K T (δ i )] represents the tangent stiffness matrix of the i-th iteration, {δ i} represents the updated displacement vector of the i-th iteration;

[0060] The specific calculation formula for updating the displacement vector is:

[0061] {δ i}={δ i-1}+[K T (δ i-1 )] -1 {R i-1};

[0062] In the formula, {δ i} represents the updated displacement vector of the i-th iteration, {δ i-1} represents the updated displacement vector of the i-1th iteration, [K T (δ i-1 )] represents the tangent stiffness matrix of the i-1th iteration, {R i-1} represents the unbalanced force vector of the i-1th iteration.

[0063] Preferably, the setting of safety parameters according to the stress data of the bridge pier and the structural change information of the bridge pier to be constructed specifically includes:

[0064] Based on the stress analysis software, the force vectors applied to the stress analysis area are obtained;

[0065] Determine the unbalanced force norm according to the number of forces and force vectors in the stress analysis area;

[0066] Compare the unbalanced force norm and the unbalanced force vector, and obtain the number of iterations in which the unbalanced force norm is smaller than the unbalanced force vector, which is recorded as the final number of iterations;

[0067] According to the final number of iterations, the updated displacement vector of the final iteration is determined as a safety parameter;

[0068] Among them, the specific calculation formula of the unbalanced force norm is:

[0069]

[0070] In the formula, ||{R}||2 represents the norm of unbalanced force, R m It represents the mth force vector in the stress analysis area, and n represents the number of forces in the stress analysis area.

[0071] Preferably, obtaining the deviation of the bridge high pier specifically includes:

[0072] Based on the stress analysis software, the updated displacement vector of the final iteration is input to generate the maximum displacement thresholds at each height of the bridge pier;

[0073] Taking the central axis of the bridge pier as the reference and the center of the bottom surface of the bridge pier as the coordinate origin, the bridge pier is analyzed by eight vertical sections passing through the center of the circle to generate 16 sets of external surface coordinate functions on the same horizontal plane. The external surface plane coordinate function of the current bridge pier is obtained every one meter in the vertical direction.

[0074] According to the bridge design plan, the expected heights of the bridge piers and the surface plane coordinate functions corresponding to the expected heights are obtained;

[0075] The deviation of the bridge pier is obtained by combining the maximum displacement threshold of each bridge height, the surface plane coordinate function of the current bridge pier, the surface plane coordinate function corresponding to each expected height and the expected height of the bridge pier;

[0076] Among them, the specific calculation formula for the deviation of bridge high pier is:

[0077]

[0078] Where P2 represents the deviation of the bridge pier, h represents the total number of times the plane coordinate function of the expected surface of the bridge pier can be collected, b represents the total number of times the plane coordinate function of the current bridge pier surface is collected, and f(x l ) represents the expected surface plane coordinate function of the bridge pier at the lth acquisition, f(y l ) represents the surface plane coordinate function of the current bridge pier collected for the first time, x lmax Indicates the maximum displacement threshold corresponding to the lth acquisition height of the bridge pier.

[0079] Preferably, generating the weather correction coefficient of the current construction project specifically includes:

[0080] Combined with the current construction progress of the bridge pier and the historical records of the pier construction, the required weather environment and the allowable deviation range of the construction environment for the current construction project are obtained;

[0081] Set weather parameter weights based on the required weather environment for the current construction project;

[0082] Obtain current construction environment information from construction weather forecast information, and record it as weather forecast verification environment information;

[0083] Combine real-time construction environment information with weather forecast verification environment information to obtain weather parameter deviation values;

[0084] Generate weather correction coefficient based on the required weather environment and weather parameter deviation value of the current construction project;

[0085] The specific calculation formula of the weather correction coefficient is:

[0086]

[0087] In the formula, C represents the weather correction coefficient, Δv represents the weather parameter deviation value, and G represents the allowable deviation range of the construction environment of the current construction project.

[0088] Preferably, the assessment of construction safety level specifically includes:

[0089] According to the historical data of high pier construction of the same type of bridge design scheme, the initial weight coefficients of construction risk value, bridge high pier deviation and weather correction coefficient of the current construction project are set;

[0090] According to the terrain data of high pier construction, each initial weight coefficient is adjusted to generate a comprehensive weight coefficient;

[0091] The safety assessment value is generated by combining the construction risk value, the deviation of the bridge pier, the weather correction factor of the current construction project and the corresponding comprehensive weight factor;

[0092] Set the safety level cutoff value, compare the safety assessment value with the safety level cutoff value, and evaluate the construction safety level.

[0093] Furthermore, a system for safety assessment of high bridge pier construction based on material stress analysis is proposed, which is used to implement any of the above-mentioned methods for safety assessment of high bridge pier construction based on material stress analysis, including:

[0094] A data collection module, which is used to collect real-time environmental information of the construction site through instruments and equipment, obtain the construction progress information of the current bridge piers, and collect the historical construction data of the piers of the same type of bridge design;

[0095] A data integration module, which is used to determine the construction environment load based on real-time construction environment information and construction weather forecast information, establish a terrain risk characteristic parameter table based on the high pier construction history data of the same type of bridge design scheme, determine the dynamic safety index, and determine the construction equipment load based on the equipment information used in the high pier construction of the bridge;

[0096] A stress analysis module, which is used to calculate and analyze the material stress of the bridge pier according to the stress analysis software, the input construction environment load, the construction equipment load and the material information used in the construction of the bridge pier, and obtain the stress data of each part of the bridge pier during construction;

[0097] A historical data storage module, which is used to store the historical data of high pier construction of the same type of bridge design scheme, and provides data backtracking and trend analysis functions to provide reference for subsequent construction;

[0098] A safety assessment module, which is used to generate an unbalanced force vector for each stress analysis area of ​​a high pier of a construction bridge by combining the elastic modulus, compressive strength, tensile strength, load conditions and stress analysis results of the material;

[0099] The risk warning module is used to analyze the real-time construction environment information in real time through the set safety parameters and construction risk values, determine whether there are safety hazards, and initiate warnings and stop construction when necessary.

[0100] Compared with the prior art, the present invention has the following beneficial effects:

[0101] The present invention proposes a method and system for evaluating the safety of high pier construction of bridges based on material stress analysis. The method determines the construction environment load according to the real-time construction environment information and the construction weather forecast information. The method determines the dynamic safety index according to the high pier construction history data of the same type of bridge design scheme. The method generates the construction risk value in combination with the construction environment load. The method determines the construction equipment load according to the equipment information used in the construction of the high pier of the bridge. The method generates the stress data of the high pier of the bridge based on the stress analysis software and predicts the structural change information of the high pier of the bridge to be constructed. The method sets the safety parameters. The method compares the safety parameters according to the current construction progress information of the high pier of the bridge and obtains the deviation of the high pier of the bridge. The method compares the real-time construction environment information and the construction weather forecast information to generate the weather correction coefficient of the current construction project. The method evaluates the construction safety level in combination with the construction risk value, the deviation of the high pier of the bridge and the weather correction coefficient of the current construction project. In this way, the data related to the construction environment are fully considered, so that the predicted construction period is more in line with reality and the risk in the construction process is reduced. In combination with the deformation of the high pier of the bridge during the construction process, the differences in the impact of the environment on different construction processes are comprehensively considered to ensure the accuracy of the evaluation results.

[0102] Figure 1 A flow chart of the method for safety assessment of high bridge pier construction based on material stress analysis proposed by the present invention;

[0103] Figure 2 A flow chart of the steps for determining the construction environment load in the present invention;

[0104] Figure 3 A flowchart of the steps for determining a dynamic safety index in the present invention;

[0105] Figure 4 A flowchart of the steps for generating a construction risk value in the present invention;

[0106] Figure 5 A flowchart of the steps of generating stress data of a high bridge pier and predicting structural change information of a high bridge pier to be constructed in the present invention;

[0107] Figure 6 A flow chart of the steps of generating a weather correction coefficient for a current construction project in the present invention;

[0108] Figure 7 This is a structural diagram of the bridge high pier construction safety assessment system based on material stress analysis proposed by the present invention. DETAILED DESCRIPTION

[0109] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0110] Reference Figure 1As shown, a method for safety assessment of high bridge pier construction based on material stress analysis includes:

[0111] Obtain real-time construction environment information and construction weather forecast information to determine the construction environment load;

[0112] Obtain the historical records of high pier construction of the same type of bridges and the terrain undulation characteristics data of high pier construction, establish a terrain risk characteristic parameter table, and determine the dynamic safety index;

[0113] Generate construction risk value based on dynamic safety index and construction weather forecast information combined with construction environmental load;

[0114] Obtain and analyze bridge design plans and determine the equipment and material information used in the construction of bridge piers;

[0115] Determine the load of construction equipment based on the equipment information used in the construction of high bridge piers;

[0116] Based on the stress analysis software, the construction environment load, construction equipment load and material information used in the construction of bridge piers are input to perform material stress analysis on bridge piers, generate bridge pier stress data and predict the structural change information of bridge piers to be constructed;

[0117] Set safety parameters based on the stress data of the bridge piers and the structural change information of the bridge piers to be constructed;

[0118] Obtain the current construction progress information of the bridge pier, compare the safety parameters, and obtain the deviation of the bridge pier;

[0119] Compare the real-time construction environment information and construction weather forecast information, and combine the current bridge pier construction progress information to generate the weather correction coefficient for the current construction project;

[0120] The construction safety level is evaluated by combining the construction risk value, the deviation of the bridge high pier and the weather correction factor of the current construction project.

[0121] This scheme determines the construction environment load based on the real-time construction environment information and the construction weather forecast information, determines the dynamic safety index based on the historical data of the high pier construction of the same type of bridge design scheme, generates the construction risk value in combination with the construction environment load, determines the construction equipment load based on the equipment information used in the construction of the bridge high pier, generates the stress data of the bridge high pier based on the stress analysis software and predicts the structural change information of the bridge high pier to be constructed, sets the safety parameters, compares the safety parameters based on the current construction progress information of the bridge high pier, obtains the deviation of the bridge high pier, compares the real-time construction environment information and the construction weather forecast information, generates the weather correction coefficient of the current construction project, and evaluates the construction safety level by combining the construction risk value, the deviation of the bridge high pier and the weather correction coefficient of the current construction project.

[0122] Reference Figure 2 As shown, determine the construction environment load, including:

[0123] Collect meteorological data from the meteorological bureau where the bridge construction site is located to determine the long-term meteorological fluctuation pattern in the area where the bridge construction site is located;

[0124] Use total station to conduct topographic survey and obtain topographic information of the construction site and surrounding areas;

[0125] Establish a meteorological observation station based on the topographic information of the construction site and surrounding areas;

[0126] Generate construction weather forecast information based on the long-term meteorological fluctuation patterns and real-time construction environment information of the bridge construction area;

[0127] Set up water level observation holes around the construction site and regularly record water level data around the construction site;

[0128] Obtain soil samples from the construction site and obtain physical information of the soil at the construction site;

[0129] Generate soil permeability data based on water level data around the construction site and physical information of the soil at the construction site;

[0130] According to the bridge design plan, determine the height of the bridge pier and obtain the wind load of the bridge pier;

[0131] Generate predicted soil moisture at the construction site based on construction weather forecast information and water level data around the construction site, and obtain soil load at the construction site in combination with soil permeability data;

[0132] The wind load on the high piers of the bridge and the soil load at the construction site are collectively referred to as construction environment loads.

[0133] It can be understood that the construction environmental load refers to the load acting on the structure or construction site due to natural environmental factors during the construction process. The construction environmental load of high bridge piers can be mainly divided into wind load and soil load at the construction site. Wind load will affect the stability of construction equipment. For example, when a crane is lifting heavy objects, strong winds may cause the crane to become unstable. At the same time, wind loads will also produce large lateral forces on the formwork and scaffolding systems of structures such as high piers, which may cause accidents such as formwork deformation and scaffolding collapse. During the construction process, it is necessary to arrange construction tasks reasonably according to weather forecasts. When the wind speed is high, stop high-altitude operations and lifting operations of large equipment. The soil at the construction site will vary depending on the region. The soil in mountainous areas has a variety of soil types due to the large terrain undulations, which in turn leads to large differences in the drainage performance of the soil in mountainous areas due to the terrain. The soil in plain areas is relatively uniform, and most of the soil is fine-grained soil such as silt and clay. The particles of these soils are fine and have a certain cohesion. When constructing high piers of bridges in plain areas, this kind of soil is easy to form after excavation, but if it is a soft soil foundation (such as highly compressible clay), it may cause foundation settlement problems. For the construction of high piers of bridges, water level observation holes should be set around the foundation and in areas that may be affected by groundwater. At the same time, the distribution of different strata should be considered to monitor the changes in water levels in different soil layers. Generally speaking, 3-5 observation holes can be set for smaller construction sites, while for large sites with complex geological conditions, more than 10 observation holes may be required to obtain water level data around the construction site.

[0134] Reference Figure 3 As shown, dynamic security indicators are determined, including:

[0135] Classify construction weather forecast information and generate meteorological element classification data;

[0136] According to the meteorological element classification data, the high pier construction history records are classified and processed to generate the same meteorological element construction history data;

[0137] Classify the historical data of construction with the same meteorological elements according to the construction type, and generate historical data of meteorological elements of the construction type;

[0138] Summarize the historical data of meteorological elements of construction types, summarize the corresponding environmental characteristic data when each construction type stops construction, and record it as the risk characteristic threshold;

[0139] Generate the time-varying coefficient of meteorological construction risk based on the meteorological element classification data and the historical records of high pier construction;

[0140] Based on the construction weather forecast information, obtain the predicted time when the meteorological data reaches the risk characteristic threshold;

[0141] According to the predicted time when the meteorological data reaches the risk characteristic threshold, the meteorological construction risk time-varying coefficient is accumulated to generate the predicted risk value;

[0142] Combined with the terrain undulation characteristic data of each high pier construction site and the risk characteristic threshold of each construction type, a terrain risk characteristic parameter table is established;

[0143] According to the terrain information of the construction site and the surrounding area, the terrain risk characteristic parameter table is retrieved to obtain the risk characteristic threshold corresponding to the current construction terrain as a dynamic safety indicator.

[0144] It is understandable that the differences in the undulating characteristics of the construction terrain will lead to different construction methods for high piers of bridges, and thus different requirements for the construction environment. According to the undulating characteristics data of the high pier construction terrain, the historical records of the high pier construction are classified and sorted, and the risk characteristic thresholds of each construction type can be obtained. Combined with the construction weather forecast information, the time required to reach the risk characteristic threshold can be obtained, and a separate risk characteristic parameter table is established for a type of high pier construction terrain undulating characteristics data. In the separate risk characteristic parameter table, based on the construction type, each construction type data is nested with the corresponding risk characteristic threshold, and the risk characteristic threshold is nested with the time required for different meteorological data to reach the risk characteristic threshold. Multiple separate risk characteristic parameter tables are integrated to generate a terrain risk characteristic parameter table.

[0145] Reference Figure 4 As shown, the construction risk value is generated, including:

[0146] According to the real-time construction environment information, the real-time wind direction and wind speed of the bridge piers are determined, and the real-time wind load of the bridge piers is generated;

[0147] Based on the terrain risk characteristic parameter table, determine the wind load characteristic threshold and soil load characteristic threshold;

[0148] According to the wind load characteristic threshold, determine the wind direction and wind speed corresponding to the wind load characteristic threshold, and obtain the predicted time of reaching the wind load characteristic threshold in combination with the construction weather forecast information;

[0149] Collect the current construction progress, obtain the current construction progress according to the high pier construction history record, generate the predicted completion time, quantify the high pier construction history record according to the construction time length, set the construction progress percentage based on the construction progress in the high pier construction history record, compare the current construction progress with the construction progress in the high pier construction history record, determine the percentage corresponding to the current construction progress, record it as the current construction progress, obtain the high pier construction history time and multiply it by the current construction progress to generate the predicted completion time;

[0150] According to the soil load characteristic threshold, determining the corresponding humidity of the soil load characteristic threshold;

[0151] Combine the water level data around the construction site and the construction weather forecast information to obtain the corresponding humidity prediction time when the soil load characteristic threshold is reached;

[0152] The construction risk value is generated by combining the predicted time to reach the wind load characteristic threshold, the predicted completion time and the corresponding moisture prediction time to reach the soil load characteristic threshold;

[0153] The specific calculation formula of the construction risk value is:

[0154]

[0155] Where P1 represents the construction risk value, α represents the predicted risk value of soil load construction, β represents the predicted risk value of wind load construction, a represents the current construction progress, e represents the natural constant, T2 represents the predicted completion time, T3 represents the corresponding humidity predicted time to reach the soil load characteristic threshold, and T1 represents the predicted time to reach the wind load characteristic threshold.

[0156] It is understandable that the construction progress determines the remaining construction period. As the construction period extends, the performance of cement and other materials used in the construction process may change due to the influence of environmental humidity, which in turn affects the construction quality. The longer the time, the less accurate the environmental prediction results. The extension of the construction period may cause the environmental data corresponding to the risk characteristic threshold to be realized ahead of schedule, increasing the risk of the construction process.

[0157] Reference Figure 5 As shown, the stress data of the bridge pier is generated and the structural change information of the bridge pier to be constructed is predicted, including:

[0158] According to the bridge design plan, determine the shape and size of the expected bridge piers, create a geometric model in the stress analysis software, and mark the geometric parameters;

[0159] According to the material information used in the construction of high bridge piers, select the appropriate material model in the software and mark the elastic modulus of the material model;

[0160] According to the structural geometric characteristics of the bridge piers, the geometric model is divided to generate stress analysis areas;

[0161] Input the construction environment load and construction equipment load into the stress analysis software to generate the load vector of the stress analysis area;

[0162] According to the elastic modulus of the material model in the stress analysis area, the initial tangent stiffness matrix is ​​established;

[0163] Combining the initial tangent stiffness matrix and the load vectors of each pair of stress analysis areas, the unbalanced force vector and the number of unbalanced forces in the stress analysis area are generated, and the unbalanced force vector and the number of forces in the stress analysis area are collectively referred to as the bridge high pier stress data;

[0164] Set an initial displacement vector, combine it with the unbalanced force vector in the stress analysis area, iterate, update the displacement vector, obtain the updated displacement vector of each iteration, and predict the structural change information of the high pier of the bridge to be constructed;

[0165] Among them, the specific calculation formula of the unbalanced force vector is:

[0166] {R i}={F}-[K T (δ i )]{δ i};

[0167] In the formula, {R i} represents the unbalanced force vector of the i-th iteration, {F} represents the load vector of the stress analysis area, [K T (δ i )] represents the tangent stiffness matrix of the i-th iteration, {δ i} represents the updated displacement vector of the i-th iteration;

[0168] The specific calculation formula for updating the displacement vector is:

[0169] {δ i}={δ i-1}+[K T (δ i-1 )] -1 {R i-1};

[0170] In the formula, {δ i} represents the updated displacement vector of the i-th iteration, {δ i-1} represents the updated displacement vector of the i-1th iteration, [K T (δ i-1 )] represents the tangent stiffness matrix of the i-1th iteration, {R i-1} represents the unbalanced force vector of the i-1th iteration.

[0171] It is understandable that, affected by the construction environment load and the construction equipment load, the outside world will exert an external force on the high bridge piers, and the high bridge piers will resist the external force due to the physical characteristics of their own materials. When the external force reaches a certain limit, they will generate internal forces to be exerted on their own regions. Because the external force is constantly changing, the external force and internal force of the high bridge piers cannot be balanced. After the two are mutually restricted, there is still an unbalanced force. Because the structural material of the high bridge piers is elastic, the unbalanced force will cause the high bridge piers to produce elastic deformation and displacement. Due to the particularity of the structure of the high bridge piers, the external force and internal force are different at each position. The upper part of the high bridge pier is subjected to a large wind load, which will produce a large lateral thrust or pull on the high pier. The bottom of the high pier serves as the connection between the structure and the foundation. The joint has to bear the inertia force of the entire superstructure. There is a force acting on the high pier along the central axis, which is called axial force. The axial force is the largest at the bottom of the high pier and gradually decreases upward along the high pier. Therefore, it is necessary to divide the stress analysis area. According to the total height of the high pier, every one meter is divided into an area, and then the area is divided into several unit segments with equal height. In the cross section, it can be divided into eight quadrants according to the principle of symmetry. For high piers with changing cross-sectional dimensions along the height direction, they can be segmented according to the nodes where the cross-sectional dimensions change. For example, the gradual transition section where the pier body transitions from a large cross-section to a small cross-section is divided into one separately. Each cross-sectional mutation point is also used as a dividing boundary to divide the high pier into multiple different unit segments, which is convenient for analyzing the stress changes in different parts when subjected to force.

[0172] Furthermore, according to the stress data of the bridge pier and the structural change information of the bridge pier to be constructed, safety parameters are set, including:

[0173] Based on the stress analysis software, the force vectors applied to the stress analysis area are obtained;

[0174] According to the number of forces and force vectors in the stress analysis area, the unbalanced force norm is determined. The unbalanced force norm is an indicator to measure the degree of unbalanced force of the structure during the iterative calculation process.

[0175] Compare the unbalanced force norm and the unbalanced force vector, and obtain the number of iterations in which the unbalanced force norm is smaller than the unbalanced force vector, which is recorded as the final number of iterations;

[0176] According to the final number of iterations, the updated displacement vector of the final iteration is determined as a safety parameter;

[0177] Among them, the specific calculation formula of the unbalanced force norm is:

[0178]

[0179] In the formula, ||{R}||2 represents the norm of unbalanced force, R mIt represents the mth force vector in the stress analysis area, and n represents the number of forces in the stress analysis area.

[0180] It is understandable that when performing material stress analysis on high bridge piers, it is necessary to judge whether the structure has reached a state of equilibrium based on the unbalanced force norm. For example, when analyzing the ultimate bearing capacity of high piers under complex load combinations, as the load gradually increases, the deformation of the structure will continue to increase. By monitoring the changes in the unbalanced force norm, it can be determined whether the structure has lost stability. If the unbalanced force norm is less than a certain unbalanced force vector, it means that the structure has reached the limit state at this time. The number of iterations at this time is obtained, and the number of iterations at this time is substituted into the calculation formula for updating the displacement vector to determine the maximum updated displacement vector.

[0181] Furthermore, the deviation of the bridge high pier is obtained, including:

[0182] Based on the stress analysis software, the updated displacement vector of the final iteration is input to generate the maximum displacement thresholds at each height of the bridge pier;

[0183] Taking the central axis of the bridge pier as the reference and the center of the bottom surface of the bridge pier as the coordinate origin, the bridge pier is analyzed by eight vertical sections passing through the center of the circle to generate 16 sets of external surface coordinate functions on the same horizontal plane. The external surface plane coordinate function of the current bridge pier is obtained every one meter in the vertical direction.

[0184] According to the bridge design plan, the expected heights of the bridge piers and the surface plane coordinate functions corresponding to the expected heights are obtained;

[0185] The deviation of the bridge pier is obtained by combining the maximum displacement threshold of each bridge height, the surface plane coordinate function of the current bridge pier, the surface plane coordinate function corresponding to each expected height and the expected height of the bridge pier;

[0186] Among them, the specific calculation formula for the deviation of bridge high pier is:

[0187]

[0188] Where P2 represents the deviation of the bridge pier, h represents the total number of times the plane coordinate function of the expected surface of the bridge pier can be collected, b represents the total number of times the plane coordinate function of the current bridge pier surface is collected, and f(x l ) represents the expected surface plane coordinate function of the bridge pier at the lth acquisition, f(y l ) represents the surface plane coordinate function of the current bridge pier collected for the first time, x lmax Indicates the maximum displacement threshold corresponding to the lth acquisition height of the bridge pier.

[0189] It is understandable that during the construction process, the high piers of bridges are affected by external environmental forces, and deformation of the outer surface is inevitable, resulting in irregular protrusions or depressions on the outer surface, which makes the actual construction of the bridge different from the expected idea of ​​the bridge design plan. The difference between this protrusion or depression and the expected appearance of the high piers of bridges is called the deviation of the high piers of bridges.

[0190] Reference Figure 6 As shown, the weather correction factor of the current construction project is generated, including:

[0191] Combined with the current construction progress of the bridge pier and the historical records of the pier construction, the required weather environment and the allowable deviation range of the construction environment for the current construction project are obtained;

[0192] Set weather parameter weights based on the required weather environment for the current construction project;

[0193] Obtain current construction environment information from construction weather forecast information, and record it as weather forecast verification environment information;

[0194] Combine real-time construction environment information with weather forecast verification environment information to obtain weather parameter deviation values;

[0195] Generate weather correction coefficient based on the required weather environment and weather parameter deviation value of the current construction project;

[0196] The specific calculation formula of the weather correction coefficient is:

[0197]

[0198] In the formula, C represents the weather correction coefficient, Δv represents the weather parameter deviation value, and G represents the allowable deviation range of the construction environment of the current construction project.

[0199] It is understandable that different construction projects have different requirements for the construction environment. In the concrete pouring process, temperature is a key factor. If the temperature correction coefficient shows that the actual temperature is lower than the expected suitable temperature range, the setting time of the concrete will be prolonged, which may lead to slow growth in concrete strength. In this case, if the formwork is removed or prestressed according to the normal construction schedule, the structure will collapse due to insufficient concrete strength. In the high-altitude construction of high piers of bridges, wind speed has a huge impact on safety. When the wind speed correction coefficient shows that the actual wind speed is high, it will pose a direct threat to the safety of construction workers. Workers working on high-altitude scaffolding will be blown by strong winds, increasing the risk of falling from heights. At the same time, strong winds will also subject construction equipment to greater lateral forces, causing the equipment to shake, tilt, or even topple over, causing serious Safety accidents. For the lifting operations of some large components, such as the lifting of bridge beams or large building steel structures, when the wind speed is too high, the components will be subjected to large wind loads in the air. During the construction stage of buildings or bridge foundations, in case of rainfall, the rainfall correction coefficient can reflect the impact of rainfall on the safety of the foundation pit. If the rainfall is too heavy, water may accumulate in the foundation pit, resulting in reduced shear strength of the soil on the side walls of the foundation pit and increased risk of foundation pit collapse. For example, in the foundation pit of soft soil foundation, the stability of the soil drops sharply after being soaked by rainwater. Once the foundation pit collapses, it will bury construction equipment and personnel, causing serious safety accidents. For pile foundation construction, excessive rainfall may affect the water level in the pile hole, increasing the difficulty and danger of bored pile construction. At the same time, rainwater erosion may cause the soil around the pile hole to loosen, affecting the bearing capacity and stability of the pile.

[0200] Furthermore, the construction safety level is evaluated, including:

[0201] According to the historical data of high pier construction of the same type of bridge design scheme, the initial weight coefficients of construction risk value, bridge high pier deviation and weather correction coefficient of the current construction project are set;

[0202] According to the terrain data of high pier construction, each initial weight coefficient is adjusted to generate a comprehensive weight coefficient;

[0203] The safety assessment value is generated by combining the construction risk value, the deviation of the bridge pier, the weather correction factor of the current construction project and the corresponding comprehensive weight factor;

[0204] Set a safety level cutoff value, compare the safety assessment value with the safety level cutoff value, and evaluate the construction safety level. When the safety assessment value is close to 0, it means that the construction safety level is high and the risk is low. When the safety assessment value is close to 1, it means that the construction safety level is low and the risk is high, and emergency measures need to be taken immediately. When the safety assessment value is between 0.3-0.7, it means that the construction safety level is medium and monitoring and prevention need to be strengthened.

[0205] Further, see Figure 7 As shown, according to the same inventive concept as the method for safety assessment of bridge high pier construction based on material stress analysis, this solution proposes a system for safety assessment of bridge high pier construction based on material stress analysis, including:

[0206] A data collection module, which is used to collect real-time environmental information of the construction site through instruments and equipment, obtain the construction progress information of the current bridge piers, and collect the historical construction data of the piers of the same type of bridge design;

[0207] A data integration module, which is used to determine the construction environment load based on real-time construction environment information and construction weather forecast information, establish a terrain risk characteristic parameter table based on the high pier construction history data of the same type of bridge design scheme, determine the dynamic safety index, and determine the construction equipment load based on the equipment information used in the high pier construction of the bridge;

[0208] A stress analysis module, which is used to calculate and analyze the material stress of the bridge pier according to the stress analysis software, the input construction environment load, the construction equipment load and the material information used in the construction of the bridge pier, and obtain the stress data of each part of the bridge pier during construction;

[0209] A historical data storage module, which is used to store the historical data of high pier construction of the same type of bridge design scheme, and provides functions such as data backtracking and trend analysis to provide reference for subsequent construction;

[0210] A safety assessment module, which is used to generate an unbalanced force vector for each stress analysis area of ​​a high pier of a construction bridge by combining the elastic modulus, compressive strength, tensile strength, load conditions and stress analysis results of the material;

[0211] The risk warning module is used to analyze the real-time construction environment information in real time through the set safety parameters and construction risk values, determine whether there are safety hazards, and initiate warnings and stop construction when necessary.

[0212] In summary, the advantages of the present invention are: it fully considers the data related to the construction environment, making the predicted construction period more realistic and reducing the risks in the construction process. It combines the deformation of the high piers of the bridge during the construction process, comprehensively considers the differences in the impact of the environment on different construction processes, and ensures the accuracy of the evaluation results.

[0213] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for safety assessment of high bridge pier construction based on material stress analysis, characterized in that: include: Obtain real-time construction environment information and construction weather forecast information to determine the construction environment load; Obtain the historical records of high pier construction of the same type of bridges and the terrain undulation characteristics data of high pier construction, establish a terrain risk characteristic parameter table, and determine the dynamic safety index; Generate construction risk value based on dynamic safety index and construction weather forecast information combined with construction environmental load; Obtain and analyze bridge design plans and determine the equipment and material information used in the construction of bridge piers; Determine the load of construction equipment based on the equipment information used in the construction of high bridge piers; Based on the stress analysis software, the construction environment load, construction equipment load and material information used in the construction of bridge piers are input to perform material stress analysis on bridge piers, generate bridge pier stress data and predict the structural change information of bridge piers to be constructed; Set safety parameters based on the stress data of the bridge piers and the structural change information of the bridge piers to be constructed; Obtain the current construction progress information of the bridge pier, compare the safety parameters, and obtain the deviation of the bridge pier; Compare the real-time construction environment information and construction weather forecast information, and combine the current bridge pier construction progress information to generate the weather correction coefficient for the current construction project; The construction safety level is evaluated by combining the construction risk value, the deviation of the bridge high pier and the weather correction factor of the current construction project.

2. A method for safety assessment of high bridge pier construction based on material stress analysis according to claim 1, characterized in that: The determination of the construction environment load specifically includes: Collect meteorological data from the meteorological bureau where the bridge construction site is located to determine the long-term meteorological fluctuation pattern in the area where the bridge construction site is located; Use total station to conduct topographic survey and obtain topographic information of the construction site and surrounding areas; Establish a meteorological observation station based on the topographic information of the construction site and surrounding areas; Generate construction weather forecast information based on the long-term meteorological fluctuation patterns and real-time construction environment information of the bridge construction area; Set up water level observation holes around the construction site and regularly record water level data around the construction site; Obtain soil samples from the construction site and obtain physical information of the soil at the construction site; Generate soil permeability data based on water level data around the construction site and physical information of the soil at the construction site; According to the bridge design plan, determine the height of the bridge pier and obtain the wind load of the bridge pier; Generate predicted soil moisture at the construction site based on construction weather forecast information and water level data around the construction site, and obtain soil load at the construction site in combination with soil permeability data; The wind load on the high piers of the bridge and the soil load at the construction site are collectively referred to as construction environment loads.

3. A method for safety assessment of high bridge pier construction based on material stress analysis according to claim 2, characterized in that: Determining the dynamic security index specifically includes: Classify construction weather forecast information and generate meteorological element classification data; According to the meteorological element classification data, the high pier construction history records are classified and processed to generate the same meteorological element construction history data; Classify the historical data of construction with the same meteorological elements according to the construction type, and generate historical data of meteorological elements of the construction type; Summarize the historical data of meteorological elements of construction types, summarize the corresponding environmental characteristic data when each construction type stops construction, and record it as the risk characteristic threshold; Generate the time-varying coefficient of meteorological construction risk based on the meteorological element classification data and the historical records of high pier construction; Based on the construction weather forecast information, obtain the predicted time when the meteorological data reaches the risk characteristic threshold; According to the predicted time when the meteorological data reaches the risk characteristic threshold, the meteorological construction risk time-varying coefficient is accumulated to generate the predicted risk value; Combined with the terrain undulation characteristic data of each high pier construction site and the risk characteristic threshold of each construction type, a terrain risk characteristic parameter table is established; According to the terrain information of the construction site and the surrounding area, the terrain risk characteristic parameter table is retrieved to obtain the risk characteristic threshold corresponding to the current construction terrain as a dynamic safety indicator.

4. A method for safety assessment of high bridge pier construction based on material stress analysis according to claim 3, characterized in that: The generating of the construction risk value specifically includes: According to the real-time construction environment information, the real-time wind direction and wind speed of the bridge piers are determined, and the real-time wind load of the bridge piers is generated; Based on the terrain risk characteristic parameter table, determine the wind load characteristic threshold and soil load characteristic threshold; According to the wind load characteristic threshold, determine the wind direction and wind speed corresponding to the wind load characteristic threshold, and obtain the predicted time of reaching the wind load characteristic threshold in combination with the construction weather forecast information; Collect the current construction progress, obtain the current construction progress based on the historical records of high pier construction, and generate a predicted completion time; According to the soil load characteristic threshold, determining the corresponding humidity of the soil load characteristic threshold; Combine the water level data around the construction site and the construction weather forecast information to obtain the corresponding humidity prediction time when the soil load characteristic threshold is reached; The construction risk value is generated by combining the predicted time to reach the wind load characteristic threshold, the predicted completion time and the corresponding moisture prediction time to reach the soil load characteristic threshold; The specific calculation formula of the construction risk value is: Where P1 represents the construction risk value, α represents the predicted risk value of soil load construction, β represents the predicted risk value of wind load construction, a represents the current construction progress, e represents the natural constant, T2 represents the predicted completion time, T3 represents the corresponding humidity predicted time to reach the soil load characteristic threshold, and T1 represents the predicted time to reach the wind load characteristic threshold.

5. A method for safety assessment of high bridge pier construction based on material stress analysis according to claim 4, characterized in that: The generating of the bridge high pier stress data and predicting the structural change information of the bridge high pier to be constructed specifically includes: According to the bridge design plan, determine the shape and size of the expected bridge piers, create a geometric model in the stress analysis software, and mark the geometric parameters; According to the material information used in the construction of high bridge piers, select the appropriate material model in the software and mark the elastic modulus of the material model; According to the structural geometric characteristics of the bridge piers, the geometric model is divided to generate stress analysis areas; Input the construction environment load and construction equipment load into the stress analysis software to generate the load vector of the stress analysis area; According to the elastic modulus of the material model in the stress analysis area, the initial tangent stiffness matrix is ​​established; Combining the initial tangent stiffness matrix and the load vectors of each pair of stress analysis areas, the unbalanced force vector and the number of unbalanced forces in the stress analysis area are generated, and the unbalanced force vector and the number of forces in the stress analysis area are collectively referred to as the bridge high pier stress data; Set an initial displacement vector, combine it with the unbalanced force vector in the stress analysis area, iterate, update the displacement vector, obtain the updated displacement vector of each iteration, and predict the structural change information of the high pier of the bridge to be constructed; Among them, the specific calculation formula of the unbalanced force vector is: {R i }={F}-[K T (d i )]{d i }; In the formula, {R i } represents the unbalanced force vector of the i-th iteration, {F} represents the load vector in the stress analysis area, [K T (δ i )] represents the tangent stiffness matrix of the i-th iteration, {δ i } represents the updated displacement vector of the i-th iteration; The specific calculation formula for updating the displacement vector is: {d} i }={δ i-1 }+[KT(δ i-1 )] -1 {R i-1 }; In the formula, {δ i } represents the updated displacement vector of the i-th iteration, {δ i-1 } represents the updated displacement vector of the i-1th iteration, [K T (δ i-1 )] represents the tangent stiffness matrix of the i-1th iteration, {R i-1 } represents the unbalanced force vector of the i-1th iteration.

6. A method for safety assessment of high bridge pier construction based on material stress analysis according to claim 5, characterized in that: The safety parameters are set according to the stress data of the bridge pier and the structural change information of the bridge pier to be constructed, specifically including: Based on the stress analysis software, the force vectors applied to the stress analysis area are obtained; Determine the unbalanced force norm according to the number of forces and force vectors in the stress analysis area; Compare the unbalanced force norm and the unbalanced force vector, and obtain the number of iterations in which the unbalanced force norm is smaller than the unbalanced force vector, which is recorded as the final number of iterations; According to the final number of iterations, the updated displacement vector of the final iteration is determined as a safety parameter; Among them, the specific calculation formula of the unbalanced force norm is: In the formula, ||{R}||2 represents the norm of unbalanced force, R m represents the th force vector in the stress analysis area, and n represents the number of forces in the stress analysis area.

7. A method for safety assessment of high bridge pier construction based on material stress analysis according to claim 6, characterized in that: The obtaining of the deviation of the bridge high pier specifically includes: Based on the stress analysis software, the updated displacement vector of the final iteration is input to generate the maximum displacement thresholds at each height of the bridge pier; Taking the central axis of the bridge pier as the reference and the center of the bottom surface of the bridge pier as the coordinate origin, the bridge pier is analyzed by eight vertical sections passing through the center of the circle to generate 16 sets of external surface coordinate functions on the same horizontal plane. The external surface plane coordinate function of the current bridge pier is obtained every one meter in the vertical direction. According to the bridge design plan, the expected heights of the bridge piers and the surface plane coordinate functions corresponding to the expected heights are obtained; The deviation of the bridge pier is obtained by combining the maximum displacement threshold of each bridge height, the surface plane coordinate function of the current bridge pier, the surface plane coordinate function corresponding to each expected height and the expected height of the bridge pier; Among them, the specific calculation formula for the deviation of bridge high pier is: Where P2 represents the deviation of the bridge pier, h represents the total number of times the plane coordinate function of the expected surface of the bridge pier can be collected, b represents the total number of times the plane coordinate function of the current bridge pier surface is collected, and f(x l ) represents the expected surface plane coordinate function of the bridge pier at the lth acquisition, f(y l ) represents the surface plane coordinate function of the current bridge pier collected for the first time, x lmax Indicates the maximum displacement threshold corresponding to the lth acquisition height of the bridge pier.

8. A method for safety assessment of high bridge pier construction based on material stress analysis according to claim 7, characterized in that: The generating of the weather correction coefficient of the current construction project specifically includes: Combined with the current construction progress of the bridge pier and the historical records of the pier construction, the required weather environment and the allowable deviation range of the construction environment for the current construction project are obtained; Set weather parameter weights based on the required weather environment for the current construction project; Obtain current construction environment information from construction weather forecast information, and record it as weather forecast verification environment information; Combine real-time construction environment information with weather forecast verification environment information to obtain weather parameter deviation values; Generate weather correction coefficient based on the required weather environment and weather parameter deviation value of the current construction project; The specific calculation formula of the weather correction coefficient is: In the formula, C represents the weather correction coefficient, Δv represents the weather parameter deviation value, and G represents the allowable deviation range of the construction environment of the current construction project.

9. A method for safety assessment of high bridge pier construction based on material stress analysis according to claim 8, characterized in that: The assessment of construction safety level specifically includes: According to the historical data of high pier construction of the same type of bridge design scheme, the initial weight coefficients of construction risk value, bridge high pier deviation and weather correction coefficient of the current construction project are set; According to the terrain data of high pier construction, each initial weight coefficient is adjusted to generate a comprehensive weight coefficient; The safety assessment value is generated by combining the construction risk value, the deviation of the bridge pier, the weather correction factor of the current construction project and the corresponding comprehensive weight factor; Set the safety level cutoff value, compare the safety assessment value with the safety level cutoff value, and evaluate the construction safety level.

10. A bridge high pier construction safety assessment system based on material stress analysis, characterized in that: A method for safety assessment of high bridge pier construction based on material stress analysis for implementing any one of claims 1 to 9, comprising: A data collection module, which is used to collect real-time environmental information of the construction site through instruments and equipment, obtain the construction progress information of the current bridge piers, and collect the historical construction data of the piers of the same type of bridge design; A data integration module, which is used to determine the construction environment load based on real-time construction environment information and construction weather forecast information, establish a terrain risk characteristic parameter table based on the high pier construction history data of the same type of bridge design scheme, determine the dynamic safety index, and determine the construction equipment load based on the equipment information used in the high pier construction of the bridge; A stress analysis module, which is used to calculate and analyze the material stress of the bridge pier according to the stress analysis software, the input construction environment load, the construction equipment load and the material information used in the construction of the bridge pier, and obtain the stress data of each part of the bridge pier during construction; A historical data storage module, which is used to store the historical data of high pier construction of the same type of bridge design scheme, and provides data backtracking and trend analysis functions to provide reference for subsequent construction; A safety assessment module, which is used to generate an unbalanced force vector for each stress analysis area of ​​a high pier of a construction bridge by combining the elastic modulus, compressive strength, tensile strength, load conditions and stress analysis results of the material; The risk warning module is used to analyze the real-time construction environment information in real time through the set safety parameters and construction risk values, determine whether there are safety hazards, and initiate warnings and stop construction when necessary.

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