Bridge structure stress state analysis method and device and storage medium

Abstract

The application provides a bridge structure stress state analysis method and device and a storage medium, which comprises the following steps: performing element division on a whole bridge structure finite element model, traversing all elements formed by the division, and determining whether a key stress substructure is contained in each element; performing stress analysis on the first element based on the whole bridge structure finite element model by using whole analysis to obtain a first analysis result; determining corresponding key stress positions according to the stress characteristics of the key stress substructure, determining boundary conditions required for modeling of a second element according to measured data obtained by a corresponding monitoring sensor arranged at each corresponding key stress position of the actual bridge; performing element division on an initial finite element model of the second element, inputting the boundary conditions, and obtaining a second analysis result; and determining the whole bridge structure stress state by combining the first analysis result and the second analysis result. The analysis method provided by the application can more accurately and quickly perform stress analysis.

Description

Technical Field

[0001] This invention relates to the field of bridge structure stress analysis technology, and in particular to a method, device and storage medium for analyzing the stress state of bridge structures. Background Technology

[0002] The fundamental concept of bridge health monitoring is to monitor and assess the stress state of bridge structures, issuing early warning signals when bridges experience abnormal weather, traffic conditions, or severe operational issues, thus providing a basis and guidance for bridge maintenance and management decisions. Bridge stress state analysis mainly includes analyzing the stress, deformation, and stability of bridges under different loads. The stress state of a bridge is influenced by various factors, including the bridge's structural type, load type, and environmental factors. The basic systems of bridge structures can be divided into five categories: beam bridges, arch bridges, rigid frame bridges, cable-stayed bridges, and suspension bridges, and their stress characteristics differ significantly depending on their structural form.

[0003] The finite element method (FEM) is a commonly used numerical analysis method for solving various physical problems in engineering and science, and it is also frequently applied in the stress analysis of bridge structures. Before performing calculations using the FEM, appropriate boundary conditions need to be defined. Boundary conditions refer to the constraints applied on the boundaries of the computational domain to simulate physical phenomena in the real world.

[0004] In the process of realizing this invention, the inventors discovered at least the following problems in the prior art:

[0005] Common methods for analyzing the stress state of existing bridge structures include finite element model simulation and experimental analysis. The finite element method divides the structure under analysis into simple, interacting elements. These elements transfer internal forces and deformations through nodes. The structural system responds to external loads based on its own characteristic parameters, and this response serves as the structural solution. To ensure computational efficiency, the division of structural elements cannot be unlimited. Therefore, a holistic analysis approach is generally adopted, initially dividing the structure into elements according to certain rules and analyzing the overall stress state to balance accuracy and computation time. If a complete finite element model of the entire bridge structure is used for simulation analysis, inaccurate results may occur. This is especially true for complex stress areas such as structures with prominent stress points, combined structures with multiple subsystems cooperating in stress, parts with multiple components cooperating in stress, and structures bearing multiple forces in different directions. In these cases, the analysis results may be even more biased.

[0006] If these complex stress-bearing parts are modeled separately, the computational accuracy of local analysis can be improved by refining the element mesh. When modeling and analyzing local components, since they are detached from the overall structure, accurate boundary conditions are required for modeling and analysis. Generally, the element analytical results from the overall analysis can be extracted as boundary conditions and applied to the local model. However, since the overall model analysis results are also analytical solutions, initial assumptions, material parameter deviations, and other factors may cause deviations between the analytical solutions and the actual stress state, thus affecting the analysis results of key local components.

[0007] However, if we were to rely entirely on actual bridge measurements, the workload would be enormous, and there would be numerous difficulties in implementing it in reality.

[0008] Therefore, there is a need for a method, device, and storage medium for analyzing the stress state of bridge structures, in order to at least partially solve the above-mentioned technical problems. Summary of the Invention

[0009] In view of this, embodiments of the present invention provide a method, apparatus and storage medium for analyzing the stress state of a bridge structure, so as to at least solve one of the problems in the prior art.

[0010] In a first aspect, embodiments of the present invention provide a method for analyzing the stress state of a bridge structure, the analysis method comprising:

[0011] The overall bridge structure finite element model is divided into elements. All elements formed by the division are traversed to determine whether each element contains a key stress-bearing substructure. Elements that do not contain key stress-bearing substructures are defined as the first element, and elements that contain key stress-bearing substructures are defined as the second element. Key stress-bearing substructures include combined structures of multiple subsystems cooperating in stress, parts of multiple components cooperating in stress, structures that bear multiple or more component forces in different directions, and structures with prominent local stress.

[0012] Based on the overall bridge structure finite element model, the first element is subjected to stress analysis using overall analysis to obtain the first analysis result;

[0013] Based on the stress characteristics of the key stress-bearing substructure, the corresponding key stress-bearing parts are determined. The boundary conditions required for the second unit modeling are determined by the measured data obtained by the corresponding monitoring sensors placed at the corresponding key stress-bearing parts of the actual bridge.

[0014] The initial finite element model of the second unit is divided into elements, and the boundary conditions are input to obtain the second analysis result;

[0015] Based on the results of the first and second analyses, the stress state of the entire bridge structure is determined.

[0016] Secondly, embodiments of the present invention also provide a bridge structure stress state analysis device, the analysis device comprising:

[0017] Memory is used to store executable instructions for a computer;

[0018] An analysis method for a processor that executes computer-executable instructions stored in the memory to implement the above-mentioned technical solution.

[0019] Thirdly, embodiments of the present invention also provide a storage medium storing computer instructions, wherein the computer instructions are used to cause the computer to execute the analysis method of the above-described technical solution.

[0020] According to the analysis method of this invention, firstly, an overall analysis is performed using the finite element model of the entire bridge structure to determine whether each unit formed by the division contains key stress-bearing substructures. For the first unit that does not contain key stress-bearing substructures, stress analysis can be directly performed using the finite element model of the entire bridge structure to obtain the first analysis result. For the relatively complex second unit that contains key stress-bearing substructures, a separate model is created for refined analysis. To obtain the boundary conditions required for modeling the second unit, measured data obtained by placing corresponding monitoring sensors at the corresponding key stress-bearing parts of the actual bridge are used to determine these conditions. Then, the boundary conditions are input to obtain the second analysis result. Finally, the stress state of the entire bridge structure is determined by combining the first and second analysis results. The analysis method of this invention can perform stress analysis of the entire bridge structure more accurately and quickly.

[0021] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows, and will also become apparent in part to those skilled in the art upon studying the description, or may be learned by practice of the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures specifically pointed out in the description and drawings.

[0022] Those skilled in the art will understand that the objectives and advantages achievable with the present invention are not limited to those specifically described above, and that the above and other objectives achievable with the present invention will become clearer from the following detailed description. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, are not intended to limit the scope of the invention. The components in the drawings are not drawn to scale but are merely illustrative of the principles of the invention. For ease of illustration and description of certain parts of the invention, corresponding portions in the drawings may be enlarged, i.e., may appear larger relative to other components in an exemplary device actually manufactured according to the invention. In the drawings:

[0024] Figure 1 A flowchart of an analysis method according to an embodiment of the present invention;

[0025] Figure 2 A flowchart of an analysis method according to another embodiment of the present invention;

[0026] Figure 3 This is a flowchart of an analysis method according to another embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the cable-stayed bridge superimposed zone in an analysis method according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the monitoring layout scheme for the cable-stayed cable cooperative system's suspended overlapping area in an analysis method according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the monitoring boundary parameters of the cable-stayed bridge overlapping zone in an analysis method according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of an analysis apparatus according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of an analysis system according to an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this invention are used to explain the invention, but are not intended to limit the invention.

[0033] It should also be noted that, in order to avoid obscuring the invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the invention are shown in the accompanying drawings, while other details that are not closely related to the invention are omitted.

[0034] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, element, step, or component, but does not exclude the presence or addition of one or more other features, elements, steps, or components.

[0035] It should also be noted that, unless otherwise specified, the term "connection" in this article can refer not only to a direct connection, but also to an indirect connection involving an intermediary.

[0036] In the following description, embodiments of the invention will be illustrated with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar parts, or the same or similar steps.

[0037] First, refer to Figure 1A method 100 for analyzing the stress state of a bridge structure according to an embodiment of this application is described. For example... Figure 1 As shown, the analysis method 100 may include steps S110 and S150. Specifically:

[0038] In step S110, the overall bridge structure finite element model is divided into elements. All elements formed by the division are traversed to determine whether each element contains a key stress-bearing substructure. Elements that do not contain key stress-bearing substructures are defined as first elements, and elements that contain key stress-bearing substructures are defined as second elements. Key stress-bearing substructures include combined structures of multiple subsystems cooperating in stress, parts of multiple components cooperating in stress, structures that bear multiple or more component forces in different directions, and structures with prominent local stress.

[0039] In step S120, based on the overall bridge structure finite element model, the first unit is subjected to stress analysis using overall analysis to obtain the first analysis result.

[0040] In step S130, the corresponding key stress-bearing parts are determined according to the stress characteristics of the key stress-bearing substructure. The boundary conditions required for the second unit modeling are determined by the measured data obtained by the corresponding monitoring sensors arranged at the corresponding key stress-bearing parts of the actual bridge.

[0041] In step S140, the initial finite element model of the second unit is divided into elements, the boundary conditions are input, and the second analysis result is obtained.

[0042] In step S150, the stress state of the entire bridge structure is determined by combining the first analysis results and the second analysis results.

[0043] In the embodiments of this application, firstly, an overall analysis is performed using the finite element model of the entire bridge structure to determine whether each unit formed by the division contains key stress-bearing substructures. For the first unit that does not contain key stress-bearing substructures, the stress analysis can be directly performed using the finite element model of the entire bridge structure to obtain the first analysis result. For the relatively complex second unit that contains key stress-bearing substructures, a separate model is created for refined analysis. To obtain the boundary conditions required for modeling the second unit, measured data obtained by placing corresponding monitoring sensors at the corresponding key stress-bearing parts of the actual bridge are used to determine these conditions. Then, the boundary conditions are input to obtain the second analysis result. Finally, the stress state of the entire bridge structure is determined by combining the first and second analysis results.

[0044] As can be seen from the above description, the analysis method 100 according to the embodiment of this application uses reliable measured data to obtain the boundary conditions required for modeling the second unit, thereby obtaining accurate simulation calculation results of the stress state of the second unit, and combining the first analysis results to realize the stress analysis of the entire bridge structure. The whole analysis process is more accurate and faster.

[0045] Among them, Figure 1 Steps S110 to S150 are shown to be performed sequentially, but this is only an example. It can be understood that the order of steps S120 and S130 is not restricted.

[0046] The following will combine Figure 1 The specific description covers the above-described steps of the analysis method 100 according to the embodiments of this application.

[0047] In the embodiments of this application, in step S110, the overall bridge structure finite element model is divided into elements, all elements formed by the division are traversed, and it is determined whether each element contains a key stress-bearing substructure; the element that does not contain a key stress-bearing substructure is defined as the first element, and the element that contains a key stress-bearing substructure is defined as the second element; wherein, the key stress-bearing substructure includes a combined structure of multiple subsystems cooperating in stress, a part of multiple components cooperating in stress, a structure that bears multiple or more component forces in different directions, and a structure with prominent local stress.

[0048] Specifically, it can be understood that a finite element model of the overall bridge structure needs to be constructed before proceeding to this step.

[0049] The construction of the overall bridge structure finite element model can be carried out using existing technologies, such as various finite element modeling software, such as Midas, Bridge Doctor, Sap2000 and other FEA software.

[0050] After the overall bridge structure finite element model is constructed, the model is divided into elements. Then, all the elements formed by the division are traversed to determine whether each element contains a key load-bearing substructure. Key load-bearing substructures include combined structures with multiple subsystems (two or more subsystems) cooperating in load-bearing, parts with multiple components (two or more components) cooperating in load-bearing, structures bearing multiple or more component forces in different directions, and structures with prominent local loads.

[0051] By analyzing whether each element contains key force-bearing substructures, we can understand the complexity of the force distribution within each element. Elements with relatively simple force distributions that do not contain key force-bearing substructures are defined as the first element. Elements containing key force-bearing substructures are defined as the second element.

[0052] In the embodiments of this application, in step S120, the first unit is subjected to stress analysis based on the overall bridge structure finite element model, and the first analysis result is obtained.

[0053] Specifically, in order to improve the efficiency of stress analysis of bridge structures, while ensuring a certain level of analysis accuracy, since the stress condition of the first unit is relatively simple, the overall bridge structure finite element model can be used to conduct stress analysis on the first unit using an overall analysis, thereby obtaining the first analysis results regarding the stress state of the first unit.

[0054] In the embodiments of this application, in step S130, the corresponding key stress-bearing parts are determined according to the stress characteristics of the key stress-bearing substructure, and the boundary conditions required for the second unit modeling are determined by the measured data obtained by the corresponding monitoring sensors arranged at the corresponding key stress-bearing parts of the actual bridge.

[0055] Specifically, see Figure 4 Taking a cable-stayed-suspension bridge system as an example, as a new type of bridge system, the industry is still not very clear about the key control indicators, stress conditions, and distribution patterns of this system. Therefore, it is necessary to determine the key load-bearing substructures through overall analysis, and then analyze the stress conditions of the key load-bearing substructures through refined modeling. Generally, FEA software such as Midas and Bridge Doctor are used for finite element overall modeling and analysis to analyze the stress and deformation results and determine that the key load-bearing substructure of the entire bridge is the cable-stayed-suspension composite zone.

[0056] Analysis of the stress characteristics of the cable-stayed composite zone reveals that the key stress-bearing components are the main beam, suspenders, and stay cables. Therefore, taking the cable-stayed composite zone of the bridge as the calculation target and considering the parameters required for its modeling, a sensor deployment scheme is first designed for the corresponding parts of the actual bridge, including the placement of cable force sensors, stress sensors, displacement sensors, and shear force sensors at appropriate locations. Figure 5 As shown, data is collected in the suspending and tensioning composite area under specific working conditions. For example, under the dynamic and static loading of the main beam in the standard lane, the cable force of the suspending cables and stay cables in the suspending and tensioning composite area is obtained, as well as the stress, displacement and shear force of the main beam under the corresponding working conditions.

[0057] Based on the cable forces of the suspenders and stay cables in the suspender-stayed composite zone, as well as the stress and displacement data of the main beam under the corresponding working conditions, the boundary conditions required for modeling the suspender-stayed composite zone are determined.

[0058] The boundary conditions required for modeling the second unit are generally determined based on the measured data from the monitoring sensors in the following manner:

[0059] The displacement data in the boundary conditions required for the second unit modeling are directly taken from the displacement data measured by the monitoring sensors.

[0060] Boundary loads required for the second unit modeling The equivalent support load is obtained in the following way:

[0061]

[0062] in, Represents the load distribution variable. This represents the actual stress distribution function. Indicates the measured stress. The numerical simulation stress represents the overall analytical section.

[0063] Input the boundary load into the initial finite element model of the second element to obtain the equivalent support load.

[0064] Taking the aforementioned cable-stayed composite zone as an example, in order to obtain the boundary conditions of the cable-stayed composite zone, the measured cable force and displacement data can be used directly and then directly input as input data into the initial finite element model constructed corresponding to the cable-stayed composite zone.

[0065] The boundary loads in the boundary conditions required for modeling the overlapping area of ​​the suspension system The equivalent support load needs to be converted to the stress distribution under the corresponding working condition of the section in the overall calculation model. (Reference) Figure 6 The stress results need to be converted into the actual stress distribution function according to the stress distribution of the cross section. Finally, based on the boundary condition settings for the modeling of the overlapping area, the corresponding support loads are calculated. Boundary loads can be input into the initial finite element model. Obtain the support loads. Reaction forces can also be input into the initial finite element model as needed. or Obtain the support load. (Reaction force here) Shear force or axial force , (This represents the bending moment at the cross section).

[0066] in,

[0067]

[0068] Where the boundary condition is a line load, This represents a one-dimensional distribution variable of the quantity. Indicates along The actual stress distribution function in the direction; when it is a surface load. This represents a variable that has a two-dimensional distribution. Indicates along The actual stress distribution function in the direction; This indicates the distance of the stress from the neutral axis of the cross section.

[0069] Of course, the initial finite element model corresponding to the overlapping area of ​​the suspension bridge can be pre-constructed using finite element modeling software. The initial finite element model can also be constructed using existing technologies, such as various finite element modeling software, such as Midas, Bridge Doctor, Sap2000 and other FEA software.

[0070] In the embodiments of this application, step S140 involves dividing the initial finite element model of the second unit into elements, inputting boundary conditions, and obtaining the second analysis result.

[0071] Specifically, before inputting boundary conditions into the initial finite element model of the second element, the initial finite element model of the second element is further divided into elements to achieve refined analysis. Then, boundary conditions are input into the initial finite element model of the second element. Continuing with the example of the cable-stayed composite zone, the boundary conditions within the cable-stayed composite zone are input at the corresponding positions. The measured cable force value is the concentrated load at the corresponding position of the main beam, and the section deflection value is the constraint displacement of the boundary support. In addition to setting the equivalent boundary support, the support load under the corresponding working condition also needs to be applied at the section. Finally, the second analysis results related to the stress state of the second element are output through the model.

[0072] In the embodiments of this application, step S150 combines the first analysis result and the second analysis result to determine the stress state of the entire bridge structure.

[0073] Finally, by combining the results of the first and second analyses, the stress state of the entire bridge structure can be determined.

[0074] In finite element method (FEM) software, result contour plots are a data visualization technique used to display the distribution of structural analysis results, such as physical quantities like stress, strain, displacement, and temperature, in the model space. Contour plots use contour lines or color changes to show the variations of these results on the model. This display method helps users intuitively understand the spatial distribution of the analysis results. Contour plots are not only used to display static analysis results but also to dynamically display results that change over time, such as in transient thermal analysis or dynamic structural analysis. These dynamic contour plots can be animated to more intuitively show the distribution of physical quantities over time.

[0075] Therefore, based on the results of the first and second analyses, especially the second analysis, the mechanical and deformation results are output in real time, and a cloud map result that can be dynamically displayed on the structural surface is generated, which facilitates real-time observation of the stress status of the structure. When the stress index exceeds the specified limit, a real-time warning can also be issued.

[0076] Furthermore, in order to achieve real-time and rapid display of the state parameters of the key force-bearing components, the results of detailed modeling and calculation are too cumbersome and time-consuming. Therefore, the initial model corresponding to the second unit adopts initial calculation, as well as periodic or on-demand update calculation. During this period, the calculation results are rapidly displayed by establishing an influence matrix for rapid response transformation.

[0077] Specifically, refer to Figure 2 and Figure 3 Based on the initial simulation results in the second analysis, the influence matrix between the associated measured data and the state parameters of the key force-bearing components is obtained.

[0078]

[0079] in, This represents the vector of response parameter changes at the control section of the key stress-bearing substructure. Represents the vector of changes in measured data. The influence matrix between the structural state parameters of the key stressor and the measured data; influence matrix coefficients. , which represents the change in state parameters caused by a unit change in boundary conditions.

[0080] Then, the measured data and influence matrix are updated periodically or as needed to obtain the time history results of the state parameters of the corresponding key force substructures, so as to achieve real-time and rapid display.

[0081] Of course, it is also necessary to obtain the response parameter change vector of the key stress-bearing substructure control section in advance. Specifically, it includes:

[0082]

[0083] In the formula This represents the initial response parameter vector of the control section of the key stress-bearing substructure. This represents the absolute response parameter vector of the control section of the key load-bearing component.

[0084] Continuing with the example of the aforementioned overlapping area, refer to... Figure 6 Since the stress state of the substructure (the overlapping area of ​​the suspension structure) can be quickly determined using some state parameters, some response parameters are selected for analysis and calculation. The calculation process using the influence matrix is ​​as follows:

[0085]

[0086] In the formula This represents the response parameter variation vector of the substructure control section. Here, it is assumed that the deflection at four locations along the longitudinal direction of the bridge is selected as the structural control parameter index. This represents the measured change vector of the boundary parameters.

[0087] In the above calculations, since the parameters sensed by the sensor are mostly state changes after monitoring begins, therefore... and The elements in the equation are uniformly represented by parameter changes. To obtain the substructure state, they should be added to the initial state. The calculation process is as follows:

[0088]

[0089] In the formula This represents the initial response parameter vector of the substructure control section. This represents the absolute response parameter vector of the substructure control section.

[0090] Initial response parameter vector It can be obtained through finite element numerical analysis or by calculating using monitoring data from the construction and completion process of the accompanying structure.

[0091] The dynamic display can automatically call the calculation results through program code compilation to generate the corresponding structural calculation result cloud map for visualization. The relevant calculation modules can be embedded into control systems such as construction monitoring systems and health monitoring systems for application.

[0092] Based on the above description, the analysis method 100 according to the embodiment of this application mainly includes four parts: overall modeling analysis, acquisition of measured data, refined modeling of substructures and real-time rapid dynamic display. It realizes multi-scale analysis of measured data, simulation and visualization, which can analyze the stress state of bridge structures more quickly and accurately, and solves the problem of boundary condition values ​​in substructure model analysis and calculation. It also provides a good way to display results and has good engineering practical value.

[0093] refer to Figure 7 An analysis apparatus 200 for implementing the analysis method according to an embodiment of this application includes a processor 210 and a memory 220. The analysis apparatus 200 may include one or more processors 210 and one or more memories 220. The memory 220 stores an executable program that is run by the processor 210. When the executable program is run by the processor 210, it causes the processor 210 to execute the analysis method 100 described above according to an embodiment of this application.

[0094] The processor 210 may be a central processing unit (CPU) or other processing units with data processing capabilities and / or instruction execution capabilities.

[0095] The memory 220 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 210 may execute the program instructions to implement the client functions (implemented by the processor) in the embodiments of this application described herein, and / or other desired functions. Various applications and various data may also be stored in the computer-readable storage medium, such as various data used and / or generated by the applications.

[0096] The analysis device 200 may also include input devices and output devices, these components being interconnected via a bus system and / or other forms of connection mechanisms. It should be noted that... Figure 7 The components and structure of the analysis device 200 shown are merely exemplary and not limiting; the analysis device 200 may also have other components and structures as needed.

[0097] The input device can be a device used by a user to input commands, and can include one or more of a keyboard, mouse, microphone, and touchscreen. Furthermore, the input device can also be any interface for receiving information.

[0098] The output device can output various information (e.g., images or sounds) to the outside (e.g., a user), and may include one or more of a display, speaker, etc. Furthermore, the output device can also be any other device with output functionality.

[0099] For example, the example analysis device 200 for implementing the analysis method 100 according to the embodiments of this application can be applied to terminal devices (such as mobile phones), tablet computers, laptop computers, ultra-mobile personal computers (UMPCs), handheld computers, netbooks, personal digital assistants (PDAs), wearable devices (such as smartwatches, smart glasses, or smart helmets), augmented reality (AR) devices, virtual reality (VR) devices, smart home devices, in-vehicle computers, and other electronic devices. The embodiments of this application do not impose any limitations on this.

[0100] Those skilled in the art can understand the specific operation of the analysis device 200 for implementing the analysis method 100 according to the embodiments of this application in conjunction with the content described above. For the sake of brevity, the specific details will not be repeated here, but only some main operations of the processor 210 will be described.

[0101] In one embodiment of this application, when the executable program is run by the processor 210, the processor 210 performs the following steps: dividing the overall bridge structure finite element model into elements, traversing all the elements formed by the division, and determining whether each element contains a key stress-bearing substructure; defining the element that does not contain a key stress-bearing substructure as the first element, and defining the element that contains a key stress-bearing substructure as the second element; wherein, the key stress-bearing substructure includes a combined structure of multiple subsystems cooperating in stress, a part of multiple components cooperating in stress, a structure bearing multiple or more component forces in different directions, and a structure with prominent local stress; performing a stress analysis on the first element based on the overall bridge structure finite element model, and obtaining a first analysis result; determining the corresponding key stress-bearing parts according to the stress characteristics of the key stress-bearing substructure, and determining the boundary conditions required for modeling the second element by obtaining the measured data from the corresponding monitoring sensors arranged at the corresponding key stress-bearing parts of the actual bridge; dividing the initial finite element model of the second element into elements, inputting the boundary conditions, and obtaining a second analysis result; combining the first analysis result and the second analysis result, determining the stress state of the entire bridge structure.

[0102] The above exemplarily illustrates an analysis method 100 according to an embodiment of this application. The following, in conjunction with... Figure 8 The present application describes an analysis system 300 provided in another aspect of the embodiments.

[0103] Reference Figure 8 This describes an example analysis system 300 for implementing the analysis method of the embodiments of this application. The analysis system 300 may include a traversal module 310, a first acquisition module 320, a first determination module 330, a second acquisition module 340, and a second determination module 350. Wherein:

[0104] Traversal module 310 is used to: divide the overall bridge structure finite element model into elements, traverse all the elements formed by the division, and determine whether each element contains a key stress-bearing substructure; define the element that does not contain a key stress-bearing substructure as the first element, and define the element that contains a key stress-bearing substructure as the second element; wherein, the key stress-bearing substructure includes a combined structure of multiple subsystems cooperating in stress, a part of multiple components cooperating in stress, a structure that bears multiple or more component forces in different directions, and a structure with prominent local stress.

[0105] The first acquisition module 320 is used to: perform stress analysis on the first unit based on the overall bridge structure finite element model and obtain the first analysis result.

[0106] The first determining module 330 is used to: determine the corresponding key stress-bearing parts based on the stress characteristics of the key stress-bearing substructure, and determine the boundary conditions required for the second unit modeling by using the measured data obtained by the corresponding monitoring sensors arranged at the corresponding key stress-bearing parts of the actual bridge.

[0107] The second acquisition module 340 is used to: divide the initial finite element model of the second unit into elements, input the boundary conditions, and obtain the second analysis result.

[0108] The second determining module 350 is used to: combine the first analysis results and the second analysis results to determine the stress state of the entire bridge structure.

[0109] The analysis system 300 proposed in this embodiment of the invention can realize rapid and accurate analysis of the entire bridge structure.

[0110] Furthermore, according to embodiments of this application, this application also provides a storage medium on which a computer program is stored. When the computer program is run by a processor, it is used to execute corresponding steps of the analysis method 100 of this application. The storage medium may, for example, include a memory card of a smartphone, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disc read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0111] Furthermore, according to embodiments of this application, this application also provides a computer program product, including computer instructions, which, when executed by a processor, implement the steps of the analysis method of embodiments of this application.

[0112] Although exemplary embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above exemplary embodiments are merely illustrative and are not intended to limit the scope of this application. Various changes and modifications can be made therein by those skilled in the art without departing from the scope and spirit of this application. All such changes and modifications are intended to be included within the scope of this application as claimed in the appended claims.

[0113] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0114] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed.

[0115] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0116] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0117] The above description is merely a specific embodiment or illustration of the embodiments of this application. The scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A method for analyzing the stress state of a bridge structure, characterized in that, The analytical method includes: The overall bridge structure finite element model is divided into elements. All elements formed by the division are traversed to determine whether each element contains a key stress-bearing substructure. Elements that do not contain key stress-bearing substructures are defined as the first element, and elements that contain key stress-bearing substructures are defined as the second element. Key stress-bearing substructures include combined structures of multiple subsystems cooperating in stress, parts of multiple components cooperating in stress, structures that bear multiple or more component forces in different directions, and structures with prominent local stress. Based on the overall bridge structure finite element model, the first element is subjected to stress analysis using overall analysis to obtain the first analysis result; Based on the stress characteristics of the key stress-bearing substructure, the corresponding key stress-bearing parts are determined. The boundary conditions required for the second unit modeling are determined by the measured data obtained by the corresponding monitoring sensors placed at the corresponding key stress-bearing parts of the actual bridge. The initial finite element model of the second unit is divided into elements, and the boundary conditions are input to obtain the second analysis result; Based on the results of the first and second analyses, the stress state of the entire bridge structure is determined.

2. The analytical method according to claim 1, characterized in that, It also includes a rapid visualization of the state parameters of key force-bearing substructures, including the following steps: Based on the initial simulation results in the second analysis, obtain the influence matrix between the correlated measured data and the state parameters of the key force-bearing substructure. The measured data and influence matrix are updated simultaneously on a regular or as-needed basis to obtain the time history results of the state parameters of the corresponding key force substructures, so as to achieve real-time and rapid display.

3. The analytical method according to claim 2, characterized in that, The acquisition of the influence matrix between the correlated measured data and the state parameters of the key force-bearing substructure specifically includes: in, This represents the vector of response parameter changes at the control section of the key stress-bearing substructure. Represents the vector of changes in measured data. The influence matrix between the structural state parameters of the key stressor and the measured data; influence matrix coefficients. , which represents the change in state parameters caused by a unit change in boundary conditions.

4. The analytical method according to claim 3, characterized in that, It also includes obtaining the response parameter change vector of the control section of the key stress substructure. Specifically, it includes: In the formula This represents the initial response parameter vector of the control section of the key stress-bearing substructure. This represents the absolute response parameter vector of the control section of the key load-bearing component.

5. The analytical method according to claim 1, characterized in that, The boundary conditions required for modeling the second unit include the boundary loads, displacements, and equivalent support loads of the key load-bearing substructures.

6. The analytical method according to claim 5, characterized in that, The boundary conditions required for modeling the second unit are determined based on the measured data from the monitoring sensors, specifically: The displacement data in the boundary conditions required for the second unit modeling are directly taken from the displacement data measured by the monitoring sensors. Boundary loads required for the second unit modeling The equivalent support load is obtained in the following way: in, Represents the load distribution variable. This represents the actual stress distribution function. Indicates the measured stress. Numerical simulation of stress representing the overall analytical section; Input the boundary load into the initial finite element model of the second element to obtain the equivalent support load.

7. The analytical method according to claim 1, characterized in that, It also includes using finite element modeling software to pre-construct the initial finite element model corresponding to the second unit.

8. The analytical method according to claim 1, characterized in that, It also includes generating dynamically displayable cloud map results on the corresponding structural surface based on the first analysis results and / or the second analysis results, so as to facilitate real-time observation of the stress status of key stress-bearing substructures.

9. A device for analyzing the stress state of a bridge structure, characterized in that, The analytical apparatus includes: Memory is used to store executable instructions for a computer; A processor, when executing computer-executable instructions stored in the memory, implements the analysis method according to any one of claims 1 to 8.

10. A storage medium storing computer instructions, wherein, The computer instructions are used to cause the computer to execute the analysis method according to any one of claims 1 to 8.

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