Cable-stayed bridge condition assessment method, system and storage medium based on inspection and monitoring fusion

Abstract

The present application discloses a cable-stayed bridge condition assessment method, system and storage medium integrating inspection and monitoring, including the following contents: determining the initial framework of the cable-stayed bridge condition assessment system according to the specification documents, the initial framework including the part layer, the component layer and the damage layer; introducing a number of monitoring indicators into the damage layer of the initial framework to form a cable-stayed bridge condition assessment system framework integrating inspection and monitoring; determining the indicator weights of each level in the cable-stayed bridge condition assessment system framework integrating inspection and monitoring, and building a cable-stayed bridge condition assessment model; according to the damage deduction value and indicator weight of each damage indicator in the damage layer, using the weighted comprehensive method to reversely calculate the scores of each component in the component layer, the scores of each part in the part layer and the score of the entire bridge condition, to complete the cable-stayed bridge condition health assessment. By constructing a cable-stayed bridge assessment model integrating inspection and monitoring, the present application breaks the barriers between detection and monitoring, forms an integrated evaluation method, and realizes an effective assessment of the health of the bridge.

Description

Technical Field

[0001] The present application relates to the field of bridge status assessment, and specifically to a cable-stayed bridge status assessment method, system and storage medium integrating inspection and monitoring. Background Art

[0002] In recent years, some progress has been made in the research of bridge condition assessment at home and abroad, but each assessment theory has its own limitations, and the assessment results obtained by various assessment schemes vary greatly. In addition, due to the limitations of traditional manual inspection, the detection location and the subjectivity of the inspection results, it is difficult to use manual inspection data alone as a complete basis for cable-stayed bridge condition assessment.

[0003] Existing evaluation schemes can be divided into three categories: evaluation based on standards and specifications, evaluation based on system engineering theory, and evaluation based on long-term monitoring data. Among them, the evaluation of the comprehensive technical condition of bridges in the evaluation based on standards and specifications often adopts the hierarchical weighted comprehensive method. This type of evaluation scheme is clear in structure, convenient in calculation, and has a wide range of applications. It is a typical evaluation scheme. The evaluation based on system engineering theory includes fuzzy comprehensive evaluation method, variable weight comprehensive evaluation method, neural network-based evaluation method, cloud theory-based evaluation method, and evaluation method based on the combination of the above methods. This evaluation scheme has defects such as uncertain variable weight mode and difficult to ensure accuracy. The data information of the structural health monitoring system or long-term monitoring system is restricted by factors such as sensor life and system stability. It is difficult to reflect the abnormality or damage of the structure in a timely and accurate manner, and it is difficult to become an ideal data source for bridge status evaluation independently. Secondly, the evaluation based on long-term monitoring data is mostly single-item evaluation, and mainly considers safety issues; for example, through the statistics of vehicle loads and the analysis of main beam stress data, the fatigue life of steel at the most unfavorable position of the main beam is studied, and the fatigue life of key cables is analyzed. At present, it is still a technical challenge to realize damage diagnosis through long-term monitoring data, and unilateral monitoring and evaluation cannot fully reflect the comprehensive performance of the structure. Summary of the invention

[0004] Purpose of the invention: In view of the limitations and poor accuracy of the existing technology, this application proposes a cable-stayed bridge condition assessment method, system and storage medium that integrates inspection and monitoring, which solves the island problem formed by inspection and monitoring and forms a more scientific cable-stayed bridge condition assessment system.

[0005] In a first aspect, the present application provides a cable-stayed bridge condition assessment method integrating inspection and monitoring, comprising the following steps:

[0006] S1, determining the initial framework of the cable-stayed bridge condition assessment system according to the specification document, the initial framework comprising a part layer, a component layer and a damage layer, the part layer comprising one or more part indicators, each part indicator corresponds to a component layer downward, the component layer comprises one or more component indicators, each component indicator corresponds to a damage layer downward, the damage layer comprises one or more subordinate detection damage indicators, and the multiple subordinate detection indicators corresponding to the same component indicator downward constitute a first parallel damage indicator group;

[0007] S2, introducing a number of monitoring indicators into the damage layer of the initial framework to form a cable-stayed bridge condition assessment system framework integrating inspection and monitoring, wherein a plurality of subordinate monitoring indicators corresponding to the same component indicator form a second parallel damage indicator group;

[0008] S3, determine the weight of indicators at each level in the cable-stayed bridge condition assessment system framework integrating inspection and monitoring, and build a cable-stayed bridge condition assessment model;

[0009] S4, based on the detection and monitoring results, determine the damage deduction value and indicator weight of each damage indicator in the damage layer, and use the weighted comprehensive method to reversely calculate the scores of each component in the component layer, the scores of each part in the part layer, and the score of the entire bridge condition to complete the health assessment of the cable-stayed bridge.

[0010] In a possible implementation manner of the first aspect, in step S1, the location indicators of the initial framework include a bridge deck system, structural components, and ancillary facilities.

[0011] In a possible implementation of the first aspect, in step S2, the monitoring indicators of the inclined cables, main beams and expansion joints are introduced into the damage layer of the initial framework to form a cable-stayed bridge status assessment system framework that integrates inspection and monitoring; wherein the monitoring indicators of the inclined cables include one or more of the number of cable force alarms, upstream and downstream cable forces, and cable force change rate; the monitoring indicators of the main beams include the number of deflection alarms and / or stress reliability; and the monitoring indicators of the expansion joints include the measuring point displacement monitoring value and / or the cumulative displacement value.

[0012] In a possible implementation of the first aspect, in step S3, the index weight of the i-th part of the bridge in the cable-stayed bridge condition assessment system framework integrated with inspection and monitoring is defined as , the index weight of the jth component at the i-th part of the bridge is , the indicator weight , Determined according to specification documents.

[0013] In a possible implementation of the first aspect, in step S3, the index weight of the kth damage of the jth component at the i-th position of the bridge is defined as , the indicator weight Determined by the following formula:

[0014] ;

[0015] ;

[0016] in, represents the assessment weight of the kth damage of the jth component at the i-th position of the bridge, represents the damage deduction value of the kth damage of the jth component at the i-th position of the bridge, It represents the normalized value of the product of the damage deduction value of the kth damage of the jth component at the ith position of the bridge and the corresponding assessment weight.

[0017] In a possible implementation of the first aspect, in step S3, the assessment weight of the kth damage of the jth component at the i-th position of the bridge is The analytic hierarchy process is used to determine the following:

[0018] Construct the evaluation matrix A:

[0019] For the m parallel indicators in the parallel indicator group, the evaluation matrix between each two indicators is defined as A=(a e,r ) m×m :

[0020] A = [ a 11 …… a 1 m ...... a e , r ...... a m 1 …… a mm ] ;

[0021] The element a of the evaluation matrix A ij Satisfy the following properties:

[0022] ;

[0023] ;

[0024] ;

[0025] Among them, a e,r Indicates the importance value of the e-th indicator relative to the r-th indicator, a r,e Indicates the importance of the rth indicator relative to the eth indicator, a e,r and a r,e are reciprocals of each other; e, r = 1, 2, ..., m; the importance value is determined according to the scaling principle;

[0026] Calculate the product of each row of the evaluation matrix A :

[0027] ;

[0028] calculate The mth root of :

[0029] ;

[0030] right Normalize and get the evaluation weight vector of m parallel indicators β =( β 1, β 2,……, β m ):

[0031] ;

[0032] The evaluation weight vector β =( β 1, β 2,……, β m ) is used as the assessment weight of the 1st, 2nd, ..., mth damage items of the damaged layer.

[0033] In a possible implementation manner of the first aspect, a step of judging whether the importance value scale of the evaluation matrix A is reasonable is further included, which specifically includes the following contents:

[0034] Sum the elements of each column in the evaluation matrix A to obtain the vector s=(s1, s2,……, s m ) ,in , calculate the maximum eigenvalue of the evaluation matrix :

[0035] ;

[0036] Among them, β e is the component of the evaluation weight vector β, for The e-th element of ;

[0037] Calculate the consistency index CI:

[0038] ;

[0039] RI is the average random consistency index of m;

[0040] Calculate the consistency ratio CR:

[0041] ;

[0042] When CR<0.1, the evaluation matrix A is reasonable. β =( β 1, β 2,……, βm ) is used as the assessment weight of the 1st, 2nd, ...mth damage items of the damaged layer. If CR does not meet the conditions, it will be corrected.

[0043] In a possible implementation manner of the first aspect, step S4 specifically includes the following content:

[0044] Calculate the scores of each component at the component level :

[0045] ;

[0046] in, represents the evaluation score of the jth component at the i-th position of the bridge; represents the damage deduction value of the k-th damage of the j-th component at the i-th position of the bridge; k∈[1,K], K represents the number of damage items;

[0047] Calculate the scores of each part at the part layer :

[0048] ;

[0049] in, is the evaluation score of the i-th part of the bridge; j∈[1,J], J represents the number of components;

[0050] Calculate the overall bridge condition score :

[0051] ;

[0052] i∈[1,I], I represents the number of parts.

[0053] In a second aspect, the present application provides a system for executing the cable-stayed bridge state assessment method, comprising:

[0054] An initial framework building module is used to determine the initial framework of the cable-stayed bridge condition assessment system according to the specification document, wherein the initial framework includes a location layer, a component layer and a damage layer;

[0055] An inspection and monitoring fusion framework construction module is used to introduce a number of monitoring indicators into the damage layer of the initial framework to form an inspection and monitoring fusion cable-stayed bridge condition assessment system framework;

[0056] The indicator weight calculation module is used to calculate the indicator weights of each level in the cable-stayed bridge condition assessment system framework integrating inspection and monitoring, and to build a cable-stayed bridge condition assessment model;

[0057] The health assessment module uses a weighted comprehensive method to calculate the scores of each component at the component layer, the scores of each part at the part layer, and the score of the entire bridge condition from the damage layer, component layer to the part layer of the cable-stayed bridge condition assessment model to complete the health assessment of the bridge.

[0058] In a third aspect, the present application provides a computer-readable storage medium having computer program instructions stored thereon, and the computer program instructions, when executed by a processor, implement the steps of the cable-stayed bridge status assessment method.

[0059] Compared with the prior art, the present invention has the following significant improvements:

[0060] 1. This application uses the hierarchical analysis method to calculate the scores of each component and each damage type. The hierarchy is clear and the goal is clear. The component status assessment score and the bridge status assessment score can be calculated based on the score of each damage type;

[0061] 2. Based on the existing hierarchical analysis model for comprehensive technical status evaluation of cable-stayed bridges, this application introduces monitoring indicators, divides the evaluation indicators into qualitative indicators and quantitative indicators, determines the evaluation standards of each indicator, and forms a cable-stayed bridge status evaluation system that integrates detection and monitoring;

[0062] 3. This application introduces monitoring indicators such as the number of cable tension alarms, upstream and downstream cable tension, cable tension change rate, main beam deflection alarm times, stress reliability, measuring point displacement monitoring value, cumulative displacement value, etc., and constructs evaluation items for inclined cables, main beams and expansion joints based on monitoring indicators of safety, applicability and durability, and integrates manual inspection to form an integrated inspection and monitoring evaluation indicator. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 A flow chart of the cable-stayed bridge condition assessment method integrating inspection and monitoring of the present application;

[0064] Figure 2 It is the initial framework of the cable-stayed bridge condition assessment system of one embodiment of the present application;

[0065] Figure 3 The cable-stayed bridge expansion joint inspection monitoring evaluation index and proportion according to one embodiment of the present application;

[0066] Figure 4 The cable-stayed bridge main beam inspection monitoring evaluation index and proportion according to one embodiment of the present application;

[0067] Figure 5 These are the monitoring and evaluation indicators and proportions of the cable-stayed cables of a cable-stayed bridge according to one embodiment of the present application. DETAILED DESCRIPTION

[0068] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0069] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0070] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application are also intended to include plural forms, unless the context clearly indicates other meanings.

[0071] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0072] In a first aspect, the present application provides a cable-stayed bridge condition assessment method integrating inspection and monitoring, comprising the following steps:

[0073] S1. Determine the initial framework of the cable-stayed bridge condition assessment system according to the specification documents. The initial framework includes a part layer, a component layer and a damage layer. The part layer includes one or more part indicators. Each part indicator corresponds to a component layer downward. The component layer includes one or more component indicators. Each component indicator corresponds to a damage layer downward. The damage layer includes one or more subordinate detection damage indicators. Multiple subordinate detection indicators corresponding to the same component indicator constitute a first parallel damage indicator group.

[0074] Conventionally, the initial frame structure is determined according to the specification document “Maintenance Specification for Long-Span Suspension Bridges and Cable-Stayed Bridges” (DB32 / T 1648-2010), Jiangsu Provincial Quality and Technical Supervision Bureau, 2010. The initial frame part layer includes three layers: bridge deck system, structural components and ancillary facilities.

[0075] S2, introducing a number of monitoring indicators into the damage layer of the initial framework to form a cable-stayed bridge condition assessment system framework integrating inspection and monitoring, and a plurality of subordinate monitoring indicators corresponding to the same component indicator downwards constitute a second parallel damage indicator group.

[0076] Exemplarily, the monitoring indicators of the inclined cables, main beams and expansion joints can be introduced into the damaged layer of the initial frame, wherein the monitoring indicators of the inclined cables include one or more of the number of cable force alarms, upstream and downstream cable forces, and cable force change rates; the monitoring indicators of the main beams include the number of deflection alarms and / or stress reliability; the monitoring indicators of the expansion joints include the measuring point displacement monitoring values ​​and / or the cumulative displacement values.

[0077] S3, determine the weights of indicators at each level in the inspection and monitoring integrated cable-stayed bridge condition assessment system framework, and build a cable-stayed bridge condition assessment model; it should be noted that the sum of the weights of each indicator in the first parallel damage indicator group is 1; the sum of the weights of each indicator in the second parallel damage indicator group is also 1.

[0078] In a possible implementation, the index weight of the i-th part of the bridge in the inspection and monitoring fusion cable-stayed bridge condition assessment system framework is defined as , the index weight of the jth component at the i-th part of the bridge is , the index weight of the kth damage of the jth component at the i-th position of the bridge is ; Weights of the above indicators , Can be directly determined according to the specification documents; indicator weight unknown.

[0079] Furthermore, the assessment weight of the kth damage of the jth component at the i-th position of the bridge is defined as , the evaluation weight The index weight used to determine the kth damage of the jth component at the i-th position of the bridge ;

[0080] ;

[0081] ;

[0082] Assessment weight It can be determined directly from the specification documents or by using the hierarchical analysis method. represents the damage deduction value of the kth damage of the jth component at the i-th position of the bridge, It represents the normalized value of the product of the damage deduction value of the kth damage of the jth component at the ith position of the bridge and the corresponding assessment weight.

[0083] Among them, the hierarchical analysis method is used to determine the evaluation weight The steps are as follows:

[0084] Construct the evaluation matrix A:

[0085] For the n parallel indicators in the parallel indicator group, the evaluation matrix between each two indicators is defined as A=(a e,r )m×m :

[0086] A = [ a 11 …… a 1 m ...... a e , r ...... a m 1 …… a mm ] ;

[0087] The element a of the evaluation matrix A ij Satisfy the following properties:

[0088] ;

[0089] ;

[0090] ;

[0091] Among them, a e,r Indicates the importance value of the e-th indicator relative to the r-th indicator, a r,e Indicates the importance of the rth indicator relative to the eth indicator, a e,r and a r,e are reciprocals of each other; e, r = 1, 2, ..., m; the importance value can be determined according to the following scaling principle.

[0092] Table 1a e,r Scaling principle

[0093] <![CDATA[a e,r Scale value of]]> Relative importance judgment 1 The e-th indicator is as important as the r-th indicator 3 The eth indicator is slightly more important than the rth indicator 5 The e-th indicator is significantly more important than the r-th indicator 7 The eth indicator is more important than the rth indicator 9 The e-th indicator is extremely important than the r-th indicator

[0094] Calculate the product of each row of the evaluation matrix A :

[0095] ;

[0096] calculate The mth root of :

[0097] ;

[0098] right Normalize and get the evaluation weight vector of m parallel indicators β =( β 1, β 2,……, β m ):

[0099] ;

[0100] The evaluation weight vector β =( β 1, β 2,……, β m ) as the assessment weight of the 1st, 2nd, ..., mth damage of the damaged layer;

[0101] Sum the elements of each column in the evaluation matrix A to obtain the vector s=(s1, s2,……, s m ) ,in , calculate the maximum eigenvalue of the evaluation matrix :

[0102] ;

[0103] Among them, β e is the component of the evaluation weight vector β, for The e-th element of ;

[0104] Preferably, in the β =( β 1, β 2,……, β m ) as the assessment weight of the 1st, 2nd, ..., mth damage of the damaged layer, a step of judging whether the importance value of the assessment matrix A is reasonable is also included, including the following contents:

[0105] Calculate the consistency index CI:

[0106] ;

[0107] RI is the average random consistency index of m;

[0108] Calculate the consistency ratio CR:

[0109] ;

[0110] When CR<0.1, the judgment given by the evaluation matrix A is reasonable. β =( β 1, β 2,……, β m ) is used as the evaluation weight of the damage layer index. If CR does not meet the conditions, it is recommended to discard the matrix or modify the matrix and recalculate it;

[0111] Optionally, the value of the average random consistency index is as follows.

[0112] Table 2 Average random consistency index values

[0113] m 1 2 3 4 5 6 7 8 9 10 RI 0 0 0.52 0.89 1.12 1.26 1.36 1.41 1.46 1.49

[0114] S4, based on the detection and monitoring results, determine the damage deduction value and indicator weight of each damage indicator in the damage layer, and use the weighted comprehensive method to reversely calculate the scores of each component in the component layer, the scores of each part in the part layer, and the score of the entire bridge condition to complete the health assessment of the cable-stayed bridge.

[0115] In a possible implementation, step S4 specifically includes the following contents:

[0116] According to the disease status table, directly query the assessment score of each disease item to determine the damage deduction value of each damage index of the damaged layer. It is recommended to use a 0-5 point system, where 0 means intact, 1 means good, 2 means better, 3 means worse, 4 means poor, and 5 means dangerous;

[0117] Calculate the scores of each component at the component level :

[0118] ;

[0119] in, represents the evaluation score of the jth component at the i-th position of the bridge (0~100); represents the damage deduction value of the kth damage of the jth component at the i-th position of the bridge (i.e., the assessment score of each disease item (0-5)); k∈[1,K], K represents the number of damage items;

[0120] Calculate the scores of each part at the part layer :

[0121] ;

[0122] in, is the evaluation score of the i-th part of the bridge (0~100); j∈[1,J], J represents the number of components;

[0123] Calculate the overall bridge condition score :

[0124] ;

[0125] i∈[1,I], I represents the number of parts.

[0126] In a second aspect, the present application provides a system for executing the cable-stayed bridge state assessment method, comprising:

[0127] An initial framework building module is used to determine the initial framework of the cable-stayed bridge condition assessment system according to the specification document, wherein the initial framework includes a location layer, a component layer and a damage layer;

[0128] An inspection and monitoring fusion framework construction module is used to introduce a number of monitoring indicators into the damage layer of the initial framework to form an inspection and monitoring fusion cable-stayed bridge condition assessment system framework;

[0129] The indicator weight calculation module is used to calculate the indicator weights of each level in the cable-stayed bridge condition assessment system framework integrating inspection and monitoring, and to build a cable-stayed bridge condition assessment model;

[0130] The health assessment module uses a weighted comprehensive method to calculate the scores of each component at the component layer, the scores of each part at the part layer, and the score of the entire bridge condition from the damage layer, component layer to the part layer of the cable-stayed bridge condition assessment model to complete the health assessment of the bridge.

[0131] It should be understood that the division of the processing modules in the above system is only a division of logical functions, and in actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. In addition, the processing modules in the system can be implemented in the form of a processor calling software; for example, the system includes a processor, the processor is connected to a memory, and instructions are stored in the memory. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the processing units of the system, wherein the processor is a general-purpose processor, such as a central processing unit or a microprocessor, and the memory is a memory within the system or a memory outside the system.

[0132] In a third aspect, the present application provides a computer-readable storage medium having computer program instructions stored thereon, and the computer program instructions, when executed by a processor, implement the cable-stayed bridge status assessment method.

[0133] For example, the above can be achieved Figure 1 The steps of the condition assessment method for a cable-stayed bridge are shown in FIG.

[0134] Computer readable storage media can be tangible devices that can hold and store instructions used by instruction execution devices. Computer readable storage media can be, for example, but not limited to, electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the above.

[0135] The computer program instructions used to perform the operations of the present application may be source code or object code written in any combination of one or more programming languages, and the computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server.

[0136] The implementation process of the present application is explained in detail below in conjunction with an application example.

[0137] (1) Constructing a cable-stayed bridge condition assessment system framework integrating inspection and monitoring:

[0138] This embodiment is based on the structural system, monitoring system, and related inspection contents of the Nanjing Dashengguan Yangtze River Bridge. Figure 2 The initial framework of the cable-stayed bridge condition assessment system is shown in the figure. The target layer represents the comprehensive condition of the bridge. The part layer is divided into three categories: bridge deck system, structural components and auxiliary facilities. The component layer includes 17 categories such as bridge deck pavement, expansion joints, main beams, and cable stays. Figure 2 The weights of each indicator in each part layer and component layer are given and , weight and Derived from the specification document "Maintenance Specifications for Large Span Suspension Bridges and Cable-stayed Bridges" (DB32 / T 1648-2010), Jiangsu Provincial Quality and Technical Supervision Bureau, 2010; the types and quantities of damage indicators in the damage layer are determined according to the monitoring items and detection contents, and the weights are unknown.

[0139] The monitoring indicators such as cable force, main beam displacement, support expansion joint displacement obtained by monitoring are added to the above initial framework to form the inspection and monitoring integrated cable-stayed bridge status assessment system framework. Among them, the damage indicators "measuring point displacement monitoring value" and "cumulative displacement value" are introduced in the component layer "expansion joint" of the part layer "bridge deck system", and the damage indicators "deflection alarm times" and "stress reliability index" are introduced in the component layer "concrete / steel structure main beam" of the part layer "structural component". The damage indicators "cable force alarm times", "upstream and downstream cable force", and "cable force change rate" are introduced in the component layer "cable" of the part layer "structural component". As shown in Tables 3 and 4, some evaluation indicators of the bridge deck system and structural components of cable-stayed bridges are shown (in order to simplify the table, only some indicators of the bridge deck system and structural component component layer are shown in the table), and some evaluation weights are Derived from the above-mentioned normative documents, some parts are to be determined.

[0140] Table 3 Evaluation indexes of cable-stayed bridge deck system

[0141]

[0142] Table 4 Evaluation indexes of cable-stayed bridge structural components

[0143]

[0144] (2) Use the analytic hierarchy process to determine the weights of indicators at each level:

[0145] Since the detection indicators remain unchanged, it is necessary to determine the introduced monitoring indicators "measuring point displacement monitoring value, cumulative displacement value, deflection alarm times, stress reliability index, cable tension alarm times, upstream and downstream cable tension, and cable tension change rate".

[0146] Taking the evaluation weight calculation of the cable-stayed cable monitoring indicators "cable force alarm times, upstream and downstream cable forces, and cable force change rate" as an example, the main maintenance technicians of domestic large-span bridge maintenance management units (senior engineers engaged in the bridge industry and professors studying bridge maintenance in colleges and universities) were consulted. A total of 40 questionnaires were sent out, 38 were collected, and the recovery rate was 95%. The opinions of four experts were used as examples for analysis and calculation.

[0147] Table 5 Questionnaire for Expert 1

[0148]

[0149] Table 6 Questionnaire for Expert 2

[0150]

[0151] Table 7 Questionnaire for Expert 3

[0152]

[0153] Table 8 Questionnaire for Expert 4

[0154]

[0155] According to the expert questionnaires listed in Tables 5 to 8, the evaluation matrices A1, A2, A3, and A4 represented in the above four questionnaires are listed.

[0156] A 1 = [ 1 5 9 1 / 5 1 3 1 / 9 1 / 3 1 ] ； A 2 = [ 1 7 9 1 / 7 1 5 1 / 9 1 / 5 1 ] ； A 3 = [ 1 7 7 1 / 7 1 3 1 / 7 1 / 3 1 ] ； A 4 = [ 1 5 9 1 / 5 1 3 1 / 9 1 / 3 1 ] ；

[0157] Take the first expert's evaluation matrix A1 for calculation example:

[0158] A 1 = [ 1 5 9 1 / 5 1 3 1 / 9 1 / 3 1 ] ；

[0159] Calculate the product M of each row of the judgment matrix i :

[0160] M i = [ 45 3 / 5 1 / 27 ] ；

[0161] Calculate M i The nth root V i :

[0162] V i = [ 3 . 557 0 . 843 0 . 333 ] ；

[0163] V i After normalization, the evaluation weight vector β is obtained i :

[0164] β i = [ 0 . 751 0 . 178 0 . 071 ] ；

[0165] Similarly, the judgment matrix evaluation weight vectors of the other three experts can be calculated and listed in Table 9.

[0166] Table 9 Expert survey weight table

[0167]

[0168] Take the first expert's evaluation matrix A1 as an example to calculate the characteristic root .

[0169] according to A 1 = [ 1 5 9 1 / 5 1 3 1 / 9 1 / 3 1 ] ； β i = [ 0 . 751 0 . 178 0 . 071 ] ；

[0170] calculate A 1 β i = [ 2 . 280 0 . 541 0 . 214 ] ；

[0171] Similarly, the characteristic roots of the other three judgment matrices can be calculated, and the results are listed in Table 10.

[0172] Table 10 Characteristic roots of the evaluation matrix

[0173]

[0174] When n=3, the average random consistency index RI is 0.52, and the consistency ratio CR is calculated. The calculation process is as follows:

[0175]

[0176] From the calculation, we can know that the consistency ratio CR of the evaluation matrix is ​​less than 0.1, so the evaluation matrix A1 is considered acceptable. The calculation of the consistency ratio CR of other judgment matrices is referred to above. If it does not meet the corresponding requirements, appropriate adjustments should be made.

[0177] After calculation, the judgments of all experts have reached the consistency requirement, and the weighted geometric mean comprehensive ranking vector method of group decision-making is used to calculate the evaluation weight. Taking the above four evaluation matrices as an example, assuming that the judgment abilities of the four experts are equal, the calculation method is as follows:

[0178] ;

[0179] ;

[0180] ;

[0181] ;

[0182]

[0183] Can be verified .

[0184] The calculation of the expert judgment matrix (i.e., the evaluation matrix) of all questionnaires is based on the above, and the final evaluation weights of the cable-stayed cable monitoring indicators are calculated as shown in Table 11.

[0185] Table 11 Evaluation weights of cable-stayed cable monitoring indicators

[0186]

[0187] Similarly, the evaluation weights of the expansion joint and main beam monitoring indicators can be calculated as shown in Tables 12 and 13.

[0188] Table 12 Evaluation weights of expansion joint monitoring indicators

[0189]

[0190] Table 13 Evaluation weights of main beam monitoring indicators

[0191]

[0192] (3) Establishing a cable-stayed bridge condition assessment model integrating inspection and monitoring:

[0193] like Figure 3-Figure 5 As shown in the figure, a condition assessment system for expansion joints, main beams and cables of cable-stayed bridges based on the integration of inspection and monitoring is formed respectively; note that the stress alarm number indicator in the monitoring link is used to detect excessive stress, so the stress alarm number indicator has no importance weight.

[0194] (4) Evaluation of the overall condition of the cable-stayed bridge:

[0195] Based on the inspection content and monitoring conditions, the deduction points for each damage indicator of the bridge deck system, structural components and ancillary facilities are obtained.

[0196] Assess the proportion according to each damage index and damage deduction value calculate , , indicator weight And weighted deduction , and finally obtain the comprehensive score of the component layer.

[0197] Finally, the comprehensive score of the bridge is calculated based on the scores of the parts, as shown in Table 14. The comprehensive score of the bridge deck is 90.91, the comprehensive score of the structural components is 80.86, and the score of the auxiliary components is 94.96. The comprehensive score of the bridge is 84.24, indicating that the bridge is in good condition.

[0198] Table 14 Comprehensive evaluation table of bridges

[0199]

[0200] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A cable-stayed bridge condition assessment method integrating inspection and monitoring, characterized in that: The steps include: S1, determining the initial framework of the cable-stayed bridge condition assessment system according to the specification document, the initial framework comprising a part layer, a component layer and a damage layer, the part layer comprising one or more part indicators, each part indicator corresponds to a component layer downward, the component layer comprises one or more component indicators, each component indicator corresponds to a damage layer downward, the damage layer comprises one or more subordinate detection damage indicators, and the multiple subordinate detection indicators corresponding to the same component indicator downward constitute a first parallel damage indicator group; S2, introducing a number of monitoring indicators into the damage layer of the initial framework to form a cable-stayed bridge condition assessment system framework integrating inspection and monitoring, wherein a plurality of subordinate monitoring indicators corresponding to the same component indicator form a second parallel damage indicator group; S3, determine the weights of indicators at each level in the cable-stayed bridge condition assessment system framework integrating inspection and monitoring, and build a cable-stayed bridge condition assessment model; specifically, it includes the following contents: The indicator weight of the i-th part of the bridge in the framework of the cable-stayed bridge condition assessment system with integrated inspection and monitoring is defined as , the index weight of the jth component at the i-th part of the bridge is , the indicator weight , Determined according to the specification documents; The index weight of the kth damage of the jth component at the i-th position of the bridge is defined as , the indicator weight Determined by the following formula: ； ； in, represents the assessment weight of the kth damage of the jth component at the i-th position of the bridge, represents the damage deduction value of the kth damage of the jth component at the i-th position of the bridge, It represents the normalized value of the product of the damage deduction value of the kth damage of the jth component at the i-th position of the bridge and the corresponding assessment weight; The evaluation weight The analytic hierarchy process is used to determine the following: Construct the evaluation matrix A: For the m parallel indicators in the parallel indicator group, the evaluation matrix between each two indicators is defined as A=(a e,r ) m×m : ； The element a of the evaluation matrix A ij Satisfy the following properties: ； ； ； Among them, a e,r Indicates the importance value of the e-th indicator relative to the r-th indicator, a r,e Indicates the importance value of the rth indicator relative to the eth indicator, a e,r and a r,e are reciprocals of each other; e, r = 1, 2, ..., m; the importance value is determined according to the scaling principle; Calculate the product of each row of the evaluation matrix A : ； calculate The mth root of : ； right Normalize and get the evaluation weight vector of m parallel indicators β =( β 1, β 2,……, β m ): ； The evaluation weight vector β =( β 1, β 2,……, β m ) as the assessment weight of the 1st, 2nd, ..., mth damage of the damaged layer; S4, based on the detection and monitoring results, determine the damage deduction value and indicator weight of each damage indicator in the damage layer, and use the weighted comprehensive method to reversely calculate the scores of each component in the component layer, the scores of each part in the part layer, and the score of the entire bridge condition to complete the health assessment of the cable-stayed bridge.

2. The cable-stayed bridge condition assessment method according to claim 1, characterized in that: In step S1, the part layer of the initial framework includes three part indicators: bridge deck system, structural components and auxiliary facilities.

3. The cable-stayed bridge condition assessment method according to claim 2, characterized in that: In step S2, the monitoring indicators of the inclined cables, main beams and expansion joints are introduced into the damage layer of the initial framework to form a cable-stayed bridge condition assessment system framework that integrates inspection and monitoring; wherein the monitoring indicators of the inclined cables include one or more of the number of cable force alarms, upstream and downstream cable forces, and cable force change rate; the monitoring indicators of the main beams include the number of deflection alarms and / or stress reliability; the monitoring indicators of the expansion joints include the displacement monitoring value of the measuring point and / or the cumulative displacement value.

4. The cable-stayed bridge condition assessment method according to claim 1, characterized in that: The step of judging whether the importance value scale of the evaluation matrix A is reasonable is also included, which specifically includes the following contents: Sum the elements of each column in the evaluation matrix A to obtain the vector s=(s1, s2,……, s m ) ,in , calculate the maximum eigenvalue of the evaluation matrix : ； Among them, β e is the component of the evaluation weight vector β, for The e-th element of ; Calculate the consistency index CI: ； RI is the average random consistency index of m; Calculate the consistency ratio CR: ； When CR<0.1, the evaluation matrix A is reasonable. β =( β 1, β 2,……, β m ) is used as the assessment weight of the 1st, 2nd, ..., mth damage of the damaged layer. If CR does not meet the conditions, the importance value of the assessment matrix A is modified.

5. The cable-stayed bridge condition assessment method according to claim 1, characterized in that: The step S4 specifically includes the following contents: Calculate the scores of each component at the component level : ； in, represents the evaluation score of the jth component at the i-th position of the bridge; represents the damage deduction value of the k-th damage of the j-th component at the i-th position of the bridge; k∈[1,K], K represents the number of damage items; Calculate the scores of each part at the part layer : ； in, is the evaluation score of the i-th part of the bridge; j∈[1,J], J represents the number of components; Calculate the overall bridge condition score : ； i∈[1,I], I represents the number of parts.

6. A system for executing the cable-stayed bridge condition assessment method according to any one of claims 1 to 5, characterized in that: include: An initial framework building module is used to determine the initial framework of the cable-stayed bridge condition assessment system according to the specification document, wherein the initial framework includes a location layer, a component layer and a damage layer; An inspection and monitoring fusion framework construction module is used to introduce a number of monitoring indicators into the damage layer of the initial framework to form an inspection and monitoring fusion cable-stayed bridge condition assessment system framework; The indicator weight calculation module is used to calculate the indicator weights of each level in the cable-stayed bridge condition assessment system framework integrating inspection and monitoring, and to build a cable-stayed bridge condition assessment model; The health assessment module uses a weighted comprehensive method to calculate the scores of each component at the component layer, the scores of each part at the part layer, and the score of the entire bridge condition from the damage layer, component layer to the part layer of the cable-stayed bridge condition assessment model to complete the health assessment of the bridge.

7. A computer-readable storage medium having computer program instructions stored thereon, characterized in that: When the computer program instructions are executed by a processor, the cable-stayed bridge status assessment method according to any one of claims 1 to 5 is implemented.

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