Cable damage identification method, device, terminal and medium based on beam deflection

Abstract

The present invention provides a cable damage identification method, device, terminal and medium based on beam deflection, which belongs to the technical field of cable damage identification. n Cable, moving load F Moving on the beam segment, the cable is intact, moving the load F The deflection increment caused by j After damage occurs, move the load F The deflection increment caused is, and the deflection increment change rate is calculated according to and, and the damage of the cable is judged according to. The present invention provides a cable damage identification method, device, terminal and medium based on beam body deflection, obtains relevant parameters through model calculation or actual measurement, and obtains the deflection increment change rate, and then judges whether the cable is damaged and determines the position of the damaged cable. The above method is simple and easy to implement, and has good feasibility.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable damage identification, and in particular relates to a cable damage identification method, device, terminal and medium based on beam deflection. Background Art

[0002] The cable-stayed bridge is one of the most important types of long-span bridges. It has a strong spanning capacity and is mainly composed of three parts: the main beam, the cable and the main tower. The cable is the most important load-bearing component. The cable can be regarded as multiple elastic supports within the span of the main beam. The main beam deadweight and live load are transmitted to the main tower through the cable, and then finally transmitted to the foundation by the main tower, which significantly reduces the bending moment of the main beam and reduces the deadweight of the beam. The cable is the component with the lowest fatigue life and the most vulnerable to damage in the entire bridge. During long-term use, the cable may be corroded under the influence of the external environment, and it is easy to suffer from pitting, wire breakage and other damages. When the damage reaches a certain extent, it may even be damaged and broken. After the cable is damaged or broken, it may cause the overall instability or destruction of the cable-stayed bridge, seriously affecting the safety of the bridge. Therefore, during the service of the cable, it is necessary to be able to detect the damaged cable in time and take corresponding measures.

[0003] At present, there are two main methods for cable damage identification: direct detection method and indirect detection method. Direct detection methods mainly include visual inspection method and cable force detection method. Visual inspection method has the disadvantages of long time consumption, low efficiency, high missed detection rate, large subjective influence, and large influence of detection environment. In addition, there is a lack of systematic demonstration of detection accuracy and stability. Cable force detection method is difficult to implement through automatic monitoring. Not only is the operation cumbersome and complicated, but the measured parameters are also easily contaminated, thus reducing the accuracy of damage identification. Summary of the invention

[0004] The purpose of the present invention is to provide a cable damage identification method, device, terminal and medium based on beam deflection, aiming to solve the problems that the existing cable damage identification method is difficult to operate and has low identification accuracy.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a cable damage identification method based on beam deflection, comprising the following steps:

[0006] The selected beam section on the main beam is set with n The cables are numbered 1, 2, ... from left to right. i , …, j、 …、 n The corresponding cable forces are 、 、 、 、 , moving load F Move from left to right on the beam segment;

[0007] When all cables are in an intact state, the moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point is ;

[0008] A damaged cable is formed after a cable is damaged. The anchor point between the damaged cable and the beam is defined as the anchor point. j , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point caused by ;

[0009] According to Lasso j The moving load is F During the movement, the two i The deflection increment change rate of the main beam anchor point position ( Deflectionincrementrateofchange ) Determine whether the cable is damaged. If so, determine the location of the damaged cable.

[0010] In one possible implementation, when the cables are in an intact state, the moving load F The deflection increment caused is , is the moving load F Acting on any cable i The deflection value generated at the anchor point of the main beam , and the selected beam segment under the action of the cable i Deflection value at the anchor point of the main beam The difference,

[0011] (1),

[0012] Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment caused by the anchorage position of the cable and the main beam The vector composed of for

[0013] (2).

[0014] In one possible implementation, the cable j After damage occurs, move the load F The deflection increment caused is , is the moving load F Acting on any cable i The deflection value generated at the anchor point of the main beam , and the selected beam segment under the action of the cable i Deflection value at the anchor point of the main beam The difference,

[0015] (3),

[0016] Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment caused by the anchorage position of the cable and the main beam The vector composed of for

[0017] (4).

[0018] In one possible implementation, the deflection increment change rate Move the load while the cables are intact F The deflection increment caused is With cable j Post-injury moving load F The deflection increment caused is Calculated,

[0019] (5),

[0020] Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment change rate caused by the anchor point position of the cable and the main beam The vector composed of for

[0021] (6).

[0022] In one possible implementation, according to the moving load F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment change rate caused by the anchor point position of the cable and the main beam The vector composed of Get the corresponding deflection increment change rate The distribution curve formed by the damage line is determined according to the position of the extreme value of the distribution curve. j location.

[0023] In one possible implementation, select any cable on the beam segment. i There is an angle between the cable and the selected beam segment, and the vertical force decomposed along the vertical direction of the cable force acting on the selected beam segment is the main force.

[0024] In one possible implementation, select any cable on the beam segment. i A displacement sensor for measuring the anchor point is arranged at the anchor point of the main beam.

[0025] A cable damage identification device based on deflection increment is provided, comprising:

[0026] The first data acquisition module is used to obtain the deflection increment when all cables are in an intact state. , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point caused by

[0027] The second data acquisition module is used to obtain the deflection increment when there is a damaged cable , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point caused by

[0028] Calculation module, used to calculate the deflection increment change rate according to the formula , deflection increment change rate Lasso j The moving load is F During the movement, the two i Deflection increment at the anchor point of the main beam

[0029] Damage identification module is used to identify the damage according to the rate of change of deflection increment , determine whether the cable is damaged. If the cable is damaged, determine the location of the damaged cable.

[0030] A terminal is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the above methods when executing the computer program.

[0031] A computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above methods are implemented.

[0032] The beneficial effects of the cable damage identification method based on beam deflection provided by the present invention are:

[0033] Compared with the prior art, the selected beam section on the main beam is analyzed. The beam section can be located in any area on the main beam, or the entire main beam is selected as the beam section for analysis. n A cable, any cable n The force of , when the cables are in an intact state, the moving load F During the movement of the selected beam segment, the cable i When the anchor point of the main beam is located, the moving load F At this point, the deflection will increase, and the deflection increment is , Lasso j When in a damaged state, the moving load F During the movement of the selected beam segment, the cable i When the anchor point of the main beam is located, the moving load F At this point, the deflection will increase, and the deflection increment is , obtain the moving load of the cable in the intact state through model calculation or actual measurement F The deflection increment generated by And the moving load of the cable under the damaged state F The deflection increment generated by , according to the deflection increments obtained for both intact and damaged cables , Calculate the deflection increment change rate , according to the deflection increment change rate Determine whether the cable is damaged and determine the damage location when damage occurs. During the identification process, data is easy to calculate or measure, and the data accuracy is high. The above method is simple and easy to implement, has high accuracy and reliability in determining the damage of the cable, and has good feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 Schematic diagram of the cable structure of the selected beam section used in the embodiment of the present invention Figure 1 ;

[0036] Figure 2 Schematic diagram of the cable structure of the selected beam section used in the embodiment of the present invention Figure 2 ;

[0037] Figure 3 Schematic diagram of the cable structure of the selected beam section used in the embodiment of the present invention Figure 3 ;

[0038] Figure 4 The elastic support continuous beam used in the embodiment of the present invention is simplified into a schematic structural diagram of an elastic foundation beam model;

[0039] Figure 5 It is a schematic diagram of the force structure of a selected beam section under the action of its own weight in a state without cable damage adopted in an embodiment of the present invention;

[0040] Figure 6 The selected beam section under the non-cable damage state adopted in the embodiment of the present invention is subjected to the moving load F Schematic diagram of the force structure under action;

[0041] Figure 7 A schematic diagram of the force structure of a selected beam section under the action of its own weight in a state where the cable is damaged, as adopted in an embodiment of the present invention;

[0042] Figure 8 The embodiment of the present invention adopts the selected beam section under the condition of cable damage under the moving load F Schematic diagram of the force structure under action. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0045] Please refer to Figures 1 to 4 A cable-stayed bridge generally includes a main tower, piers, a main beam and cables. Taking the floating cable-stayed bridge system in which the main tower and the pier are fixed and the main tower and the main beam are separated as an example, a vertical support is arranged below the main beam. The vertical support is arranged at the main tower and the pier. A plurality of cables are arranged on the main beam. One end of the cable is fixed on the main beam, and the other end of the cable is fixed on the main tower. There is an angle between the cable and the main beam. n Root Lasso, n The cables are numbered 1, 2, ... from left to right. i , …, j、 …、 n , 1, 2, ..., i , …, j、 …、 n The cable forces generated on the cables are 、 、 、 、 The force on the selected beam section is similar to that of a continuous beam bridge with a multi-point elastic support system. The anchor points of the cables and the selected beam section can be regarded as elastic supports, and the elastically supported continuous beam can be simplified into an elastic foundation beam model.

[0046] Please refer to Figures 1 to 8 Now, a specific implementation of a cable damage identification method based on beam deflection provided by the present invention is described, which includes the following steps:

[0047] The selected beam section on the main beam is set with n The cables are numbered 1, 2, ... from left to right.i , …, j、 …、 n The corresponding cable forces are 、 、 、 、 , moving load F Move from left to right on the beam segment;

[0048] When all cables are in an intact state, the moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point caused by ;

[0049] A damaged cable is formed after a cable is damaged. The anchor point between the damaged cable and the beam is defined as the anchor point. j , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point caused by ;

[0050] According to Lasso j The moving load is F During the movement, the two i The deflection increment change rate of the main beam anchor point position ( Deflectionincrementrateofchange ) Determine whether the cable is damaged. If so, determine the location of the damaged cable.

[0051] The cable damage identification method based on beam deflection provided by the present invention is compared with the prior art. The selected beam section on the main beam is analyzed. The beam section can be located in any area on the main beam, or the entire main beam is selected as the beam section for analysis. n A cable, any cable n The force of , when the cables are in an intact state, the moving load F During the movement of the selected beam segment, the cable i When the anchor point of the main beam is located, the moving load F At this point, the deflection will increase, and the deflection increment is , Lasso jWhen in a damaged state, the moving load F During the movement of the selected beam segment, the cable i When the anchor point of the main beam is located, the moving load F At this point, the deflection will increase, and the deflection increment is , obtain the moving load of the cable in the intact state through model calculation or actual measurement F The deflection increment generated by And the moving load of the cable under the damaged state F The deflection increment generated by , according to the deflection increments obtained for both intact and damaged cables , Calculate the deflection increment change rate , according to the deflection increment change rate Determine whether the cable is damaged and determine the damage location when damage occurs. During the identification process, data is easy to calculate or measure, and the data accuracy is high. The above method is simple and easy to implement, has high accuracy and reliability in determining the damage of the cable, and has good feasibility.

[0052] For details, please refer to Figures 1 to 8 , select a beam segment along the length of the main beam. The selected beam segment can be located in any area of ​​the main beam, or the entire main beam can be selected as a beam segment for analysis. n Root Lasso, n The cables are numbered 1, 2, ... from left to right. i , …, j、 …、 n , 1, 2, ..., i , …, j、 …、 n The cable forces generated on the cables are 、 、 、 、 , the selected beam segment has a certain deflection under the action of its own gravity, and the moving load F Move from left to right on the selected beam segment to move the load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, it will cause the cable i The stress on the anchor point of the main beam changes, causing the deflection of the point to increase. When all cables are in an intact state, the moving load F In the process of moving on the selected beam segment, the cablei The anchorage point with the main beam is under moving load F The deflection increment before and after is , a certain cable j When the damaged cable is formed after the damage, the moving load F In the process of moving on the selected beam segment, the cable i The anchorage point with the main beam is under moving load F The deflection increment before and after is , according to Lasso j In the same cable before and after the damage i Anchor point with main beam, moving load when cable is intact F Deflection increment Moving load with damaged cable F Deflection increment The calculation can obtain the moving load of the cable before and after damage F The rate of change of deflection increment at this point , analyze moving loads F In the Razo i Deflection increment rate of the anchor point with the main beam , determine whether the cable is damaged. If the cable is damaged, determine the position of the damaged cable. The data is easy to calculate or measure during the identification process, and the data accuracy is high. The above method is simple and easy to implement, and has high accuracy and reliability in judging the damage of the cable, and has good feasibility.

[0053] As a specific implementation of the cable damage identification method based on beam deflection provided by the present invention, please refer to Figures 1 to 8 , when the cables are intact, the moving load F The deflection increment caused is , is the moving load F Acting on any cable i The deflection value generated at the anchor point of the main beam , and the selected beam segment under the action of the cable i Deflection value at the anchor point of the main beam The difference,

[0054] (1),

[0055] Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment caused by the anchorage position of the cable and the main beam The vector composed of for

[0056] (2).

[0057] For details, please refer to Figures 1 to 8 When the cables are in an intact state, the selected beam segment is under the action of its own weight. i The initial deflection deformation at the anchor point of the main beam , moving load F Move on the selected beam segment to change the force on the selected beam segment and obtain the moving load F Acting on the cable i Deflection value at the anchor point of the main beam , and The difference between the two is the moving load when the cables are in an intact state. F Move on the selected beam segment, the deflection increment of the selected beam segment , cable 1, 2, ..., i , …, j、 …、 n The deflection increments at the anchor points of the main beam are , forming a vector .

[0058] As a specific implementation of the cable damage identification method based on beam deflection provided by the present invention, please refer to Figures 1 to 8 , Lasso j After damage occurs, move the load F The deflection increment caused is , is the moving load F Acting on any cable i The deflection value generated at the anchor point of the main beam , and the selected beam segment under the action of the cable i Deflection value at the anchor point of the main beam The difference,

[0059] (3),

[0060] Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment caused by the anchorage position of the cable and the main beam The vector composed of for

[0061] (4).

[0062] For details, please refer to Figures 1 to 8 , when Lasso jWhen both are in a damaged state, the selected beam segment is under the action of its own weight. i The initial deflection deformation at the anchor point of the main beam , moving load F Move on the selected beam segment to change the force on the selected beam segment and obtain the moving load F Acting on the cable i Deflection value at the anchor point of the main beam , and The difference between j When in a damaged state, move the load F Move on the selected beam segment, the deflection increment of the selected beam segment , cable 1, 2, ..., i , …, j、 …、 n The deflection increments at the anchor points of the main beam are , forming a vector .

[0063] As a specific implementation of the cable damage identification method based on beam deflection provided by the present invention, please refer to Figures 1 to 8 , deflection increment change rate Move the load while the cables are intact F The deflection increment caused is With cable j Post-injury moving load F The deflection increment caused is Calculated,

[0064] (5),

[0065] Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment change rate caused by the anchor point position of the cable and the main beam The vector composed of for

[0066] (6).

[0067] For details, please refer to Figures 1 to 8 , according to the moving load when the cables are intact F The deflection increment caused is With cable j Post-injury moving load F The deflection increment caused is The deflection increment rate of the cable before and after damage is calculated , cable 1, 2, ..., i , …, j、 …、 n The rate of change of deflection increment at the anchor point of the main beam is , forming a vector .

[0068] As a specific implementation of the cable damage identification method based on beam deflection provided by the present invention, please refer to Figures 1 to 8 , according to the moving load F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment change rate caused by the anchor point position of the cable and the main beam The vector composed of Get the corresponding deflection increment change rate The distribution curve formed by the damage line is determined according to the position of the extreme value of the distribution curve. j location.

[0069] For details, please refer to Figures 1 to 8 , by moving the load F After 1, 2, ..., i , …, j、 …、 n Deflection increment change rate caused by the anchor point position of the cable and the main beam Get the deflection increment change rate vector , according to the deflection increment change rate vector It can be obtained that the cables 1, 2, ..., i , …, j、 …、 n The damage line is determined by the position of the extreme value of the distribution curve. j The position of the damage cable j Lasso j Deflection increment rate caused by the anchor point position of the main beam There will be a significant change, that is, the deflection increment change rate vector In the Razo j If there are two damaged cables, when the two damaged cables are adjacent, the deflection increment change rate vector The extreme value is generated in the middle of the two damaged cables. When the two damaged cables are not adjacent, the deflection increment change rate vector An extreme value is generated at each of the two damaged cables, and the position of the damaged cable is determined according to the position of the extreme value of the distribution curve.

[0070] As a specific implementation of the cable damage identification method based on beam deflection provided by the present invention, please refer to Figures 1 to 8 , select any cable on the beam segment i There is an angle between the cable and the selected beam segment, and the vertical force decomposed along the vertical direction of the cable force acting on the selected beam segment is the main force.

[0071] For details, please refer to Figures 1 to 8 , n The angles between the cables and the main beam are 、 、 The cable is set at different positions and has different inclination directions. The cable is inclined toward the left side of the selected beam section, or toward the right side of the selected beam section. The spacing between two adjacent cables on the main beam is consistent. At the end of the selected beam section, the left end of the selected beam section A The bending moment at a point is , the vertical force is , the axial force is , select the left end of the beam segment B The bending moment at a point is , the vertical force is , the axial force is , ignoring the axial deformation of the selected beam segment, that is, not considering the horizontal axial force at the left and right ends of the selected beam segment, and analyzing the vertical component of the cable force. i The force component in the vertical direction is:

[0072] (7).

[0073] As a specific implementation of the cable damage identification method based on beam deflection provided by the present invention, please refer to Figures 1 to 8 , select any cable on the beam segment i A displacement sensor for measuring the anchor point is arranged at the anchor point of the main beam.

[0074] For details, please refer to Figures 1 to 8 , select any cable on the beam segment i The deflection value at the anchor point of the main beam is measured using a displacement sensor, which is set at any cable on the selected beam section. i At the anchor point of the main beam, the displacement sensor can measure the displacement of any cable on the selected beam section. i Displacement value of anchor point with main beam, cable i The displacement value of the anchor point of the main beam is equivalent to the deflection value of the point.

[0075] Based on the same inventive concept, the embodiment of the present application further provides a cable damage identification device based on deflection increment. Now, a specific implementation of a cable damage identification device based on deflection increment is described, including:

[0076] The first data acquisition module is used to obtain the deflection increment when all cables are in an intact state. , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point caused by ;

[0077] The second data acquisition module is used to obtain the deflection increment when there is a damaged cable , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point caused by ;

[0078] Calculation module, used to calculate the deflection increment change rate according to the formula , deflection increment change rate Lasso j The moving load is F During the movement, the two i Deflection increment at the anchor point of the main beam;

[0079] Damage identification module is used to identify the damage according to the rate of change of deflection increment , determine whether the cable is damaged. If the cable is damaged, determine the location of the damaged cable.

[0080] Specifically, the device can intuitively obtain the moving load when the cables are in an intact state. F Deflection increment under action , Moving load with damaged cable F Deflection increment under action , calculate the deflection increment change rate , according to the deflection increment change rate , to judge the damage of the cable, various parameters can be quickly obtained, the efficiency of judging the damaged cable can be improved, and the position of the damaged cable can be accurately determined, which improves the judgment accuracy, simplifies the judgment process, and has good practicality.

[0081] Based on the same inventive concept, an embodiment of the present application also provides a terminal. A specific implementation of a terminal is now described, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of any of the methods described above are implemented.

[0082] Specifically, in this embodiment, the terminal may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal may include, but is not limited to, a processor and a memory, and may include more components than the above structure, or a combination of certain components, or different components. For example, the terminal may also include input and output devices, network access devices, buses, etc.

[0083] The processor may be a central processing unit, or other general-purpose processors, digital signal processors, application-specific integrated circuits, field programmable gate arrays, or other programmable logic device discrete gates or discrete hardware components of transistor logic devices. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor. The memory may be an internal storage unit of the terminal, such as a hard disk or memory of the terminal. The memory may also be an external storage device of the terminal, such as a plug-in hard disk, a smart memory card, or a flash memory card equipped on the terminal.

[0084] Based on the same inventive concept, an embodiment of the present application also provides a computer-readable storage medium. A specific implementation of a computer-readable storage medium is now described. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of any of the methods described above are implemented.

[0085] Specifically, each functional unit in each embodiment of the present invention may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of a software functional unit. If the integrated module or unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.

[0086] Based on this understanding, the present invention implements all or part of the processes in the above-mentioned implementation method, and can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above-mentioned identification method can be implemented.

[0087] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cable damage identification method based on beam deflection, characterized in that: The following steps are involved: The selected beam section on the main beam is set with n The cables are numbered 1, 2, ... from left to right. i , …, j、 …、 n The corresponding cable forces of each cable are 、 、 、 , moving load F Move from left to right on the beam segment; When all cables are in an intact state, the moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point is , the selected beam segment is under the action of its own weight, the cable i The initial deflection deformation at the anchor point of the main beam , moving load F Move on the selected beam segment to change the force on the selected beam segment and obtain the moving load F Acting on the cable i Deflection value at the anchor point of the main beam , and The difference between the two is the moving load when the cables are in an intact state. F Move on the selected beam segment, the deflection increment of the selected beam segment , （1）， Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment caused by the anchorage position of the cable and the main beam The vector composed of for （2）； A damaged cable is formed after a cable is damaged. The anchor point between the damaged cable and the beam is defined as the anchor point. j , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point is , the selected beam segment is under the action of its own weight, the cable i The initial deflection deformation at the anchor point of the main beam , moving load F Move on the selected beam segment to change the force on the selected beam segment and obtain the moving load F Acting on the cable i Deflection value at the anchor point of the main beam , and The difference between j When in a damaged state, move the load F Move on the selected beam segment, the deflection increment of the selected beam segment , （3）， Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment caused by the anchorage position of the cable and the main beam The vector composed of for （4）； According to Lasso j The moving load is F During the movement, the two i Deflection increment change rate at the anchor point of the main beam Determine whether the cable is damaged. If so, determine the location of the damaged cable.

2. A cable damage identification method based on beam deflection as claimed in claim 1, characterized in that: Deflection increment rate of change Move the load while the cables are intact F The deflection increment caused is With cable j Post-injury moving load F The deflection increment caused is Calculated, （5）， Moving loads F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment change rate caused by the anchor point position of the cable and the main beam The vector composed of for （6）。 3. A cable damage identification method based on beam deflection as claimed in claim 2, characterized in that: According to the moving load F Respectively in 1, 2, ..., i , …, j、 …、 n Deflection increment change rate caused by the anchor point position of the cable and the main beam The vector composed of Get the corresponding deflection increment change rate The distribution curve formed by the damage line is determined according to the position of the extreme value of the distribution curve. j location.

4. The cable damage identification method based on beam deflection according to claim 1, characterized in that: Select any cable on the beam segment i There is an angle between the cable and the selected beam segment, and the vertical force decomposed along the vertical direction of the cable force acting on the selected beam segment is the main force.

5. The cable damage identification method based on beam deflection according to claim 1, characterized in that: Select any cable on the beam segment i A displacement sensor for measuring the anchor point is arranged at the anchor point of the main beam.

6. A cable damage identification device based on beam deflection, characterized in that: include: The first data acquisition module is used to obtain the deflection increment when all cables are in an intact state. , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point is ; The second data acquisition module is used to obtain the deflection increment when there is a damaged cable , moving load F During the movement, the moving load F Acting on any cable i When the anchor point of the main beam is located, the moving load F The deflection increment at this point is ; Calculation module, used to calculate the deflection increment change rate according to the formula , deflection increment change rate Lasso j The moving load is F During the movement, the two i Deflection increment at the anchor point of the main beam; Damage identification module is used to identify the damage according to the rate of change of deflection increment , determine whether the cable is damaged. If the cable is damaged, determine the location of the damaged cable.

7. A terminal comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium storing a computer program, characterized in that When the computer program is executed by a processor, the steps of the method described in any one of claims 1 to 5 are implemented.

Images