Abnormity real-time diagnosis method and system for old slab bridge strain real-time monitoring data based on force transmission index

Abstract

The invention relates to the technical field of bridge data monitoring, in particular to an abnormal real-time diagnosis method and system for old slab bridge strain real-time monitoring data based on a force transmission index, and the method comprises the steps: collecting strain monitoring data of n main beam components of an old bridge superstructure at any t moment, processing the strain monitoring data, and converting the strain monitoring data into displacement monitoring data; calculating a force transfer index between the i and j main beam components of the old bridge superstructure at the t moment, and constructing a force transfer index threshold matrix of the old bridge superstructure with n main beam components; and an anomaly judgment function of the strain monitoring data of the ith main beam component of the old bridge superstructure at the t moment is constructed, when the anomaly judgment function is 0, it is indicated that the displacement monitoring data of the ith main beam component at the t moment is not abnormal, and otherwise, it is indicated that the displacement monitoring data of the ith main beam component at the t moment is abnormal. The data accuracy of an old bridge strain real-time monitoring system is enhanced, the situation of bridge structure safety monitoring misjudgment is eliminated in time, and the reliability of bridge safety monitoring and safety evaluation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge data monitoring, and in particular to a method and system for abnormal real-time diagnosis of real-time monitoring data of strain of an old slab bridge based on a force transmission index. Background Art

[0002] During the service period, old bridges will have different degrees of diseases due to the long-term influence of factors such as traffic load, environmental erosion and material aging. These diseases include cracks, deformation, corrosion, etc., which seriously affect the structural safety and service life of the bridge. In order to avoid further structural damage and bridge safety accidents, it is necessary to conduct regular inspection and safety monitoring of the safety status of the old bridge because it is the upper main beam structure of the bridge. Since the period of regular inspection is 1 to 3 years, the timeliness of the control of the structural safety status is insufficient. In order to be able to grasp the safety status of the bridge in real time, the bridge health monitoring system came into being. By installing sensors to monitor the structural response of the bridge, such as strain monitoring indicators that can characterize the safety of the bridge, the strain changes of the bridge structure are monitored in real time, and abnormal changes of the structure are discovered and diagnosed in time, thereby providing a scientific basis for the maintenance and management of the bridge. However, there are anomalies in the real-time strain monitoring data other than structural damage. The main anomalies are data anomalies caused by non-degradation of the old bridge structure such as sensor failure, signal interference and external interference, which will lead to misjudgment of bridge safety and affect the accuracy and reliability of the real-time strain monitoring system.

[0003] In order to solve the problem of data anomaly in strain monitoring systems, most technologies use machine learning to train monitoring data and establish prediction models for anomaly judgment. However, there is uncertainty in the selection of model parameters and randomness of abnormal monitoring data, which leads to certain errors in the data anomaly judgment of the established prediction model. In addition, the computational cost required by machine learning is high, and a model needs to be established for each strain measurement point, which has certain limitations in practical engineering applications. In order to solve the above problems, based on the mechanical drive analysis of the structural characteristics of the old bridge, a real-time diagnosis method and system for the real-time monitoring data of the old plate bridge strain based on the force transmission index is proposed. Summary of the invention

[0004] In view of the problems in the prior art, the present invention provides a method and system for real-time abnormal diagnosis of real-time monitoring data of strain of old bridges based on force transmission indicators. The specific technical solution is as follows:

[0005] A real-time abnormal diagnosis method for real-time strain monitoring data of an old bridge based on a force transmission index comprises the following steps: Step S1, collecting strain monitoring data of n main beam components of the superstructure of the old bridge at any time t, assuming that the strain monitoring data of the i-th main beam component at time t is ε i (t), i = 1, 2, ..., n;

[0006] Step S2: strain monitoring data ε i (t) is processed to obtain the processed strain monitoring data ε i '(t), and the processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t);

[0007] Step S3, based on the strain monitoring data D of n main beam components processed at any time t i '(t) Calculate the force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t ij , we can get the force transmission index matrix h(t) of n main beam components at any time t nxn ;

[0008] Step S4, constructing the force transmission index threshold matrix H of the old bridge superstructure with n main beam components nxn ;

[0009] Step S5, constructing an abnormality judgment function F of the strain monitoring data of the i-th main beam component of the old bridge superstructure at time t i (t), when the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t i (t) is 0, indicating that there is no abnormality in the strain monitoring data of the i-th main beam component at time t. When the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t is i (t) is 1, indicating that the strain monitoring data of the i-th main beam component at time t is abnormal.

[0010] Preferably, in step S2, the processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t)Specifications are as follows:

[0011] D i '(t)=kε i '(t);

[0012]

[0013] Among them, l represents the calculated span of the main beam, y represents the distance between the neutral axis of the main beam of the superstructure and the lower edge of the section, and y is a fixed value for the main beam structure with the same superstructure cross-section.

[0014] Preferably, in step S3, the force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t is ij The calculation method is as follows:

[0015]

[0016] The force transmission index matrix h(t) of n main beam components at any time t is nxn It is expressed as:

[0017]

[0018] Preferably, the step S4 constructs a force transmission index threshold matrix H of the old bridge superstructure having n main beam components. nxn The specific steps include:

[0019] Step S41, using orthogonal test design damage conditions, for the old bridge superstructure with n main beam components in the transverse direction, the orthogonal test factors include the stiffness damage EI' of the superstructure main beam and the damage degree μ at the force transmission device i , a total of 2n-1 factors; the factor level is 3 levels, including 0%, 50% and 100%;

[0020] Step S42, according to the damage condition of the upper part of the old bridge designed by orthogonal test, calculate the force transmission index h between the i-th and j-th main beam components under different conditions ij , and then get the force transmission index h ij The interval range [L ij ,U ij ]; among them, L ij =minh ij , U ij =maxh ij , L ij It represents the minimum value of the force transmission index between the i-th and j-th main beam components under all damage conditions of the orthogonal test design, U ij It represents the maximum value of the force transmission index between the i-th and j-th main beam components under all damage conditions of the orthogonal test design;

[0021] Step S43, according to the force transmission index h between different components ij The interval range [L ij ,U ij ] Construct the force transmission index threshold matrix H of the old bridge superstructure with n main beam components nxn , as follows:

[0022]

[0023] Preferably, in step S42, the force transmission index h under different damage conditions of the upper part of the old bridge is ij The calculation method is as follows: Step S421, calculating the displacement ω of the damaged main beam structure under the unit uniform load P;

[0024] Step S422, based on the displacement ω of the main beam structure after damage, calculate the displacement d of the i-th main beam structure under the action of the unit uniformly distributed load P considering the damage of the main beam structure and the damage of the force transmission device i ;

[0025] Step S423, according to the displacement d of the i-th main beam structure i and the jth main beam structure displacement d j Calculate the force transmission index h between the i-th and j-th main beam components ij , as follows:

[0026]

[0027] Preferably, the calculation method of the displacement ω of the damaged main beam structure under the unit uniformly distributed load P in step S421 is as follows:

[0028]

[0029] Among them, l represents the calculated span of the main beam, and EI' represents the stiffness damage of the upper structure.

[0030] Preferably, the displacement d of the i-th main beam structure under the unit uniformly distributed load P in step S422, considering the damage of the main beam structure and the damage of the force transmission device i The calculation method is as follows:

[0031] Step S4221, calculate the shear force q at the force transmission device between each main beam component. For an old bridge structure with n main beam components in the transverse direction, when the unit uniformly distributed load P acts on the i-th main beam component, the shear force q of the force transmission device between each main beam component is calculated as follows:

[0032]

[0033] in,

[0034]

[0035] Δ i,p =Δ i-1,p = -ωi = 1, 2, ..., n-1;

[0036] In the formula, Δ i,p represents the relative displacement caused by the unit uniformly distributed load P on the i-th force transmission device; Δ i,j represents the relative vertical displacement caused by the shear force at the jth force transmission device to the ith force transmission device; μ i Indicates the damage degree of the i-th force transmission device, μ∈[0,100%; ω indicates the displacement of the main beam structure after damage; It indicates the central rotation angle of the main beam component caused by the shear force at the force transmission device; q irepresents the shear force at the i-th force transmission device;

[0037] Step S4222, based on the shear force q of the force transmission device between the main beam components, calculate the main beam structure displacement d under the unit uniform load P, the formula is as follows:

[0038] d 1 =q 1 ;

[0039] d i-1 =q i-1 -q i-2 ;

[0040] d i =1-q i-1 -q i ;

[0041] d i+1 =q i -q i+1 ;

[0042] d n =q n-1 .

[0043] Preferably, the abnormal judgment function F of the strain monitoring data of the i-th main beam component of the old bridge superstructure at time t is constructed i (t) are as follows:

[0044]

[0045] Among them, T nxn (i, j) represents the element in the i-th row and j-th column in the force transmission index threshold matrix.

[0046] A real-time abnormal diagnosis system for old bridge strain real-time monitoring data based on force transmission indicators, using the method described, comprising:

[0047] The data acquisition module is used to collect the strain monitoring data of n main beam components of the old bridge superstructure at any time t. Suppose the strain monitoring data of the i-th main beam component at time t is ε i (t), i = 1, 2, ..., n;

[0048] Data processing module, used to process strain monitoring data i (t) is processed to obtain the processed strain monitoring data ε i '(t), and the processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t);

[0049] The force transmission index calculation module is used to calculate the strain monitoring data D of n main beam components after processing at any time t. i '(t) Calculate the force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t ij , we can get the force transmission index matrix h(t) of n main beam components at any time t nxn ;

[0050] The threshold matrix construction module is used to construct the force transmission index threshold matrix H of the old bridge superstructure with n main beam components. nxn ; Anomaly judgment module, used to construct the anomaly judgment function F of the strain monitoring data of the i-th main beam component of the old bridge superstructure at time t i (t), when the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t i (t) is 0, indicating that there is no abnormality in the strain monitoring data of the i-th main beam component at time t. When the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t is i (t) is 1, indicating that the strain monitoring data of the i-th main beam component at time t is abnormal.

[0051] An electronic device includes a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the abnormal real-time diagnosis method of the real-time monitoring data of the strain of an old bridge based on a force transmission index.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. The force transmission index and force transmission index matrix established by the present invention based on real-time strain monitoring data can realize the joint characterization of the strain monitoring relationship of each main beam component, which is convenient for the joint judgment of data anomalies of a single strain measurement point and multiple strain measurement points.

[0054] 2. Based on the force transmission index matrix and the force transmission index threshold matrix, the present invention establishes an abnormality judgment function for the real-time strain monitoring data of each main beam component of the superstructure of the old bridge, which can realize rapid judgment of abnormal real-time strain monitoring data, quickly locate sensors with abnormal monitoring data, promptly discover problems in the monitoring system, and reduce the cost of operation and maintenance of the monitoring system.

[0055] 3. The present invention enhances the data accuracy of the real-time monitoring system for strain of old bridges, timely eliminates misjudgments in bridge structure safety monitoring, and improves the reliability of bridge safety monitoring and safety assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0057] Figure 1 The present invention is a flow chart of the method.

[0058] Figure 2 It is a system principle diagram of the present invention. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0061] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0062] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0063] Embodiment 1:

[0064] like Figure 1 As shown, this embodiment provides a method for real-time abnormal diagnosis of real-time monitoring data of strain of an old bridge based on a force transmission index, comprising the following steps:

[0065] Step S1, collect the strain monitoring data of n main beam components of the old bridge superstructure at any time t, and assume that the strain monitoring data of the i-th main beam component at time t is ε i (t), i=1,2,...,n.

[0066] Step S2: strain monitoring data ε i (t) is processed to obtain the processed strain monitoring data ε i '(t), and the processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t). Specifically, the strain monitoring data ε i (t) The improved filtering algorithm is used for filtering to obtain the processed strain monitoring data ε i '(t). The improved filtering algorithm is as follows: first, the strain monitoring data ε i (t) The 3-times standard deviation method is used to determine whether the data is abnormal. If the data is abnormal, the strain monitoring data is eliminated, and the linear interpolation method is used to supplement the strain monitoring data, and then mean filtering is performed.

[0067] The processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t)Specifications are as follows:

[0068] D i '(t)=kε i '(t);

[0069]

[0070] Among them, l represents the calculated span of the main beam, y represents the distance between the neutral axis of the main beam of the superstructure and the lower edge of the section, and y is a fixed value for the main beam structure with the same superstructure cross-section.

[0071] For the superstructure main beam of the old bridge, under the action of vehicle external load, the calculation formula of the displacement d and strain ε of the superstructure main beam at the mid-span position is as follows:

[0072]

[0073] Where M s It represents the bending moment value of the mid-span section of the upper main beam structure of the old bridge under the external load of vehicles;

[0074] Under the same load effect on the same section of the main beam of the superstructure of the old bridge, the relationship between the force transmission index based on displacement and the force transmission index based on strain is as follows:

[0075]

[0076] In the formula, k is a constant for the main beam structure with the same superstructure cross-section type. The force transmission index relationship based on displacement is consistent with the force transmission index based on strain. Therefore, the present invention converts the processed strain monitoring data into displacement monitoring data, which can help to judge the abnormality of strain data.

[0077] Step S3, based on the strain monitoring data D of n main beam components processed at any time t i '(t) Calculate the force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t ij , we can get the force transmission index matrix h(t) of n main beam components at any time t nxn The force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t is ij The calculation method is as follows:

[0078]

[0079] The force transmission index matrix h(t) of n main beam components at any time t is nxn It is expressed as:

[0080]

[0081] Step S4, constructing the force transmission index threshold matrix H of the old bridge superstructure with n main beam components nxn The specific steps include:

[0082] Step S41, using orthogonal test design damage conditions, for the old bridge superstructure with n main beam components in the transverse direction, the orthogonal test factors include the stiffness damage EI' of the superstructure main beam and the damage degree μ at the force transmission device i , a total of 2n-1 factors; the factor levels are 3 levels, including 0%, 50% and 100%.

[0083] Step S42, according to the damage condition of the upper part of the old bridge designed by orthogonal test, calculate the force transmission index h between the i-th and j-th main beam components under different conditions ij , and then get the force transmission index h ij The interval range [L ij ,U ij ]; among them, L ij =minh ij , U ij =maxh ij , L ij It represents the minimum value of the force transmission index between the i-th and j-th main beam components under all damage conditions of the orthogonal test design, U ij It represents the maximum value of the force transmission index between the i-th and j-th main beam components under all damage conditions of the orthogonal test design.

[0084] Among them, the force transmission index h under different damage conditions of the upper part of the old bridge is ij The calculation method is as follows:

[0085] Step S421, calculate the displacement ω of the damaged main beam structure under the unit uniformly distributed load P; the calculation method is as follows:

[0086]

[0087] Among them, l represents the calculated span of the main beam, and EI' represents the stiffness damage of the upper structure.

[0088] Step S422, based on the displacement ω of the main beam structure after damage, calculate the displacement d of the i-th main beam structure under the action of the unit uniformly distributed load P considering the damage of the main beam structure and the damage of the force transmission device i The displacement d of the i-th main beam structure under the unit uniformly distributed load P considering the damage of the main beam structure and the damage of the force transmission device i The calculation method is as follows:

[0089] Step S4221, calculate the shear force q at the force transmission device between each main beam component. For an old bridge structure with n main beam components in the transverse direction, when the unit uniformly distributed load P acts on the i-th main beam component, the shear force q of the force transmission device between each main beam component is calculated as follows:

[0090]

[0091] in,

[0092]

[0093] Δ i,p =Δ i-1,p = -ωi = 1, 2, ..., n-1;

[0094] In the formula, Δ i,p represents the relative displacement caused by the unit uniformly distributed load P on the i-th force transmission device; Δ i,j represents the relative vertical displacement caused by the shear force at the jth force transmission device to the ith force transmission device; μ i Indicates the damage degree of the i-th force transmission device, μ∈[0,100%; ω indicates the displacement of the main beam structure after damage; It indicates the central rotation angle of the main beam component caused by the shear force at the force transmission device; q i represents the shear force at the i-th force transmission device.

[0095] Step S4222, based on the shear force q of the force transmission device between the main beam components, calculate the main beam structure displacement d under the unit uniform load P, the formula is as follows:

[0096] d 1 =q 1 ;

[0097] d i-1 =q i-1 -q i-2 ;

[0098] d i =1-q i-1 -q i ;

[0099] d i+1 =q i -q i+1 ;

[0100] d n =q n-1 .

[0101] Step S423, according to the displacement d of the i-th main beam structure i and the jth main beam structure displacement d j Calculate the force transmission index h between the i-th and j-th main beam components ij , as follows:

[0102]

[0103] Step S43, according to the force transmission index h between different components ij The interval range [L ij ,U ij ] Construct the force transmission index threshold matrix H of the old bridge superstructure with n main beam components nxn , as follows:

[0104]

[0105] Step S5, constructing an abnormality judgment function F of the strain monitoring data of the i-th main beam component of the old bridge superstructure at time t i (t), when the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t i (t) is 0, indicating that there is no abnormality in the strain monitoring data of the i-th main beam component at time t. When the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t is i (t) is 1, indicating that the strain monitoring data of the i-th main beam component at time t is abnormal.

[0106] The abnormal judgment function F of the strain monitoring data of the i-th main beam component of the old bridge superstructure at time t is constructed i (t) are as follows:

[0107]

[0108] Among them, T nxn (i, j) represents the element in the i-th row and j-th column in the force transmission index threshold matrix.

[0109] Embodiment 2:

[0110] like Figure 2 As shown, based on the same inventive concept as that of Example 1, this embodiment provides an abnormal real-time diagnosis system for real-time monitoring data of strain of an old plate bridge based on a force transmission index, and the method described is applied, including:

[0111] The data acquisition module is used to collect the strain monitoring data of n main beam components of the old bridge superstructure at any time t. Suppose the strain monitoring data of the i-th main beam component at time t is ε i (t), i = 1, 2, ..., n;

[0112] Data processing module, used to process strain monitoring data i (t) is processed to obtain the processed strain monitoring data ε i '(t), and the processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t);

[0113] The force transmission index calculation module is used to calculate the strain monitoring data D of n main beam components after processing at any time t. i '(t) Calculate the force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t ij , we can get the force transmission index matrix h(t) of n main beam components at any time t nxn ;

[0114] The threshold matrix construction module is used to construct the force transmission index threshold matrix H of the old bridge superstructure with n main beam components. nxn ; Anomaly judgment module, used to construct the anomaly judgment function F of the strain monitoring data of the i-th main beam component of the old bridge superstructure at time t i (t), when the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t i (t) is 0, indicating that there is no abnormality in the strain monitoring data of the i-th main beam component at time t. When the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t is i (t) is 1, indicating that the strain monitoring data of the i-th main beam component at time t is abnormal.

[0115] The abnormal real-time diagnosis system of this embodiment can be used to monitor the strain change of the main beam of the upper structure under the external loads such as vehicles and the environment in real time, and judge the safety status of the old bridge during its service life. It specifically includes a hardware system and a software system. The hardware system includes a data acquisition module, and the software system includes a data processing module, a force transmission index calculation module, a threshold matrix construction module, and an abnormality judgment module. Among them, the data acquisition module includes a fiber Bragg grating strain gauge with a strain measurement range of ±1500με, a measurement accuracy of 0.2% FS, and an operating temperature range of -30℃~+85℃.

[0116] Embodiment 3:

[0117] Based on the same inventive concept as Example 1, this embodiment provides an electronic device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the real-time abnormal diagnosis method of the real-time monitoring data of the strain of the old bridge based on the force transmission index.

[0118] Those of ordinary skill in the art will appreciate that the modules of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition of each example has been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0119] In the embodiments provided by the present invention, it should be understood that the division of modules is only a logical function division, and there may be other division methods in actual implementation, for example, multiple modules can be combined into one module, one module can be split into multiple modules, or some features can be ignored, etc.

[0120] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0121] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-0nlyMemory), random access memory (RAM, RandomAccessMemory), mobile hard disk, magnetic disk or optical disk, etc., various media that can store program codes.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A real-time abnormal diagnosis method for old bridge strain real-time monitoring data based on force transmission index, characterized in that: The following steps are involved: Step S1, collect the strain monitoring data of n main beam components of the old bridge superstructure at any time t, and assume that the strain monitoring data of the i-th main beam component at time t is ε i (t), i = 1, 2, ..., n; Step S2: strain monitoring data ε i (t) is processed to obtain the processed strain monitoring data ε i '(t), and the processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t); Step S3, based on the strain monitoring data D of n main beam components processed at any time t i '(t) Calculate the force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t ij , we can get the force transmission index matrix h(t) of n main beam components at any time t nxn ; Step S4, constructing the force transmission index threshold matrix H of the old bridge superstructure with n main beam components nxn ; Step S5, constructing an abnormality judgment function F of the strain monitoring data of the i-th main beam component of the old bridge superstructure at time t i (t), when the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t i (t) is 0, indicating that there is no abnormality in the strain monitoring data of the i-th main beam component at time t. When the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t is i (t) is 1, indicating that the strain monitoring data of the i-th main beam component at time t is abnormal.

2. The method for abnormal real-time diagnosis of strain real-time monitoring data of old bridge based on force transmission index according to claim 1 is characterized in that: In step S2, the processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t)Specifications are as follows: D i '(t)=kε i '(t); Among them, l represents the calculated span of the main beam, y represents the distance between the neutral axis of the main beam of the superstructure and the lower edge of the section, and y is a fixed value for the main beam structure with the same superstructure cross-section.

3. The method for abnormal real-time diagnosis of old bridge strain real-time monitoring data based on force transmission index according to claim 1 is characterized in that: The force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t in step S3 is ij The calculation method is as follows: The force transmission index matrix h(t) of n main beam components at any time t is nxn It is expressed as:

4. The method for abnormal real-time diagnosis of strain real-time monitoring data of old bridge based on force transmission index according to claim 1 is characterized in that: The step S4 constructs a force transmission index threshold matrix H of the old bridge superstructure having n main beam components. nxn The specific steps include: Step S41, using orthogonal test design damage conditions, for the old bridge superstructure with n main beam components in the transverse direction, the orthogonal test factors include the stiffness damage EI' of the superstructure main beam and the damage degree μ at the force transmission device i , a total of 2n-1 factors; the factor level is 3 levels, including 0%, 50% and 100%; Step S42, according to the damage condition of the upper part of the old bridge designed by orthogonal test, calculate the force transmission index h between the i-th and j-th main beam components under different conditions ij , and then get the force transmission index h ij The interval range [L ij ,U ij ]; among them, L ij =minh ij , U ij =maxh ij , L ij It represents the minimum value of the force transmission index between the i-th and j-th main beam components under all damage conditions of the orthogonal test design, U ij It represents the maximum value of the force transmission index between the i-th and j-th main beam components under all damage conditions of the orthogonal test design; Step S43, according to the force transmission index h between different components ij The interval range [L ij ,U ij ] Construct the force transmission index threshold matrix H of the old bridge superstructure with n main beam components nxn , as follows:

5. The method for abnormal real-time diagnosis of strain real-time monitoring data of old bridge based on force transmission index according to claim 1 is characterized in that: The force transmission index h under different damage conditions of the upper part of the old bridge in step S42 ij The calculation method is as follows: Step S421, calculating the displacement ω of the damaged main beam structure under the unit uniformly distributed load P; Step S422, based on the displacement ω of the main beam structure after damage, calculate the displacement d of the i-th main beam structure under the action of the unit uniformly distributed load P considering the damage of the main beam structure and the damage of the force transmission device i ; Step S423, according to the displacement d of the i-th main beam structure i and the jth main beam structure displacement d j Calculate the force transmission index h between the i-th and j-th main beam components ij , as follows:

6. The method for abnormal real-time diagnosis of old bridge strain real-time monitoring data based on force transmission index according to claim 5 is characterized in that: The calculation method of the displacement ω of the damaged main beam structure under the unit uniformly distributed load P in step S421 is as follows: Among them, l represents the calculated span of the main beam, and EI' represents the stiffness damage of the upper structure.

7. The method for abnormal real-time diagnosis of old bridge strain real-time monitoring data based on force transmission index according to claim 5 is characterized in that: The displacement d of the i-th main beam structure under the unit uniformly distributed load P in step S422, considering the damage of the main beam structure and the damage of the force transmission device i The calculation method is as follows: Step S4221, calculate the shear force q at the force transmission device between each main beam component. For an old bridge structure with n main beam components in the transverse direction, when the unit uniformly distributed load P acts on the i-th main beam component, the shear force q of the force transmission device between each main beam component is calculated as follows: in, D i,p =D i-1,p =-ωi=1,2,...,n-1; In the formula, Δ i,p represents the relative displacement caused by the unit uniformly distributed load P on the i-th force transmission device; Δ i,j represents the relative vertical displacement caused by the shear force at the jth force transmission device to the ith force transmission device; μ i Indicates the damage degree of the i-th force transmission device, μ∈[0,100%; ω indicates the displacement of the main beam structure after damage; It indicates the central rotation angle of the main beam component caused by the shear force at the force transmission device; q i represents the shear force at the i-th force transmission device; Step S4222, based on the shear force q of the force transmission device between the main beam components, calculate the main beam structure displacement d under the unit uniform load P, the formula is as follows: d1 = q1; d i-1 =q i-1 -q i-2 ; d i =1-q i-1 -q i ; d i+1 =q i -q i+1 ; d n =q n-1 。 8. The method for abnormal real-time diagnosis of old bridge strain real-time monitoring data based on force transmission index according to claim 1 is characterized in that: The abnormal judgment function F of the strain monitoring data of the i-th main beam component of the old bridge superstructure at time t is constructed i (t) are as follows: Among them, T nxn (i, j) represents the element in the i-th row and j-th column in the force transmission index threshold matrix.

9. A real-time abnormal diagnosis system for old bridge strain real-time monitoring data based on force transmission indicators, characterized in that: The method according to any one of claims 1 to 8 comprises: The data acquisition module is used to collect the strain monitoring data of n main beam components of the old bridge superstructure at any time t. Suppose the strain monitoring data of the i-th main beam component at time t is ε i (t), i = 1, 2, ..., n; Data processing module, used to process strain monitoring data i (t) is processed to obtain the processed strain monitoring data ε i '(t), and the processed strain monitoring data ε i '(t) is converted into displacement monitoring data D i '(t); The force transmission index calculation module is used to calculate the strain monitoring data D of n main beam components after processing at any time t. i '(t) Calculate the force transmission index h(t) between the i-th and j-th main beam components of the old bridge superstructure at time t ij , we can get the force transmission index matrix h(t) of n main beam components at any time t nxn ; The threshold matrix construction module is used to construct the force transmission index threshold matrix H of the old bridge superstructure with n main beam components. nxn ; The abnormality judgment module is used to construct the abnormality judgment function F of the strain monitoring data of the i-th main beam component of the superstructure of the old bridge at time t i (t), when the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t i (t) is 0, indicating that there is no abnormality in the strain monitoring data of the i-th main beam component at time t. When the abnormality judgment function F of the strain monitoring data of the i-th main beam component at time t is i (t) is 1, indicating that the strain monitoring data of the i-th main beam component at time t is abnormal.

10. An electronic device, characterized in that: It includes a memory and a processor, the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the abnormal real-time diagnosis method of the real-time monitoring data of the strain of the old plate bridge based on the force transmission index as described in any one of claims 1 to 8.

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