CN106780164B - Efficient bridge structure damage identification system - Google Patents

Efficient bridge structure damage identification system Download PDF

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CN106780164B
CN106780164B CN201611248084.6A CN201611248084A CN106780164B CN 106780164 B CN106780164 B CN 106780164B CN 201611248084 A CN201611248084 A CN 201611248084A CN 106780164 B CN106780164 B CN 106780164B
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Abstract

The invention discloses an efficient bridge structure damage identification system which comprises a data mining module, a data transmission module, a data processing module and a damage early warning module, wherein the data mining module is used for mining a bridge structure; the data mining module acquires original data influencing a bridge structure through a sensor and transmits the original data to the data processing module through the data transmission module; the data processing module is used for processing the received data; and the damage early warning module is used for evaluating the damage condition of the bridge according to the processed data. The method has high data processing speed, and can rapidly give the damage grade of the bridge structure, thereby timely and accurately evaluating and early warning the damage condition of the bridge structure.

Description

Efficient bridge structure damage identification system
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a high-efficiency bridge structure damage identification system.
Background
The bridge is the throat of urban traffic, plays an important role in national economy and people's life, and brings damages of different degrees to a plurality of concrete bridge structures along with the increase of urban traffic, vehicle overload, environmental change and other reasons, so that effective damage identification on the bridge structures gradually becomes a considerable research focus for ensuring traffic safety. The traditional bridge structure damage identification system is limited to the change of static and dynamic parameters of a bridge structure at a certain moment, and due to the complexity of the bridge structure and the diversity of factors influencing the damage of the bridge structure, the damage condition of the bridge structure cannot be quickly and effectively predicted by the traditional bridge structure damage identification system.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide an efficient bridge structure damage identification system.
The purpose of the invention is realized by adopting the following technical scheme:
a high-efficiency bridge structure damage identification system comprises a data mining module, a data transmission module, a data processing module and a damage early warning module; the data mining module acquires original data influencing a bridge structure through a sensor and transmits the original data to the data processing module through the data transmission module; the data processing module is used for processing the received data; and the damage early warning module is used for evaluating the damage condition of the bridge according to the processed data.
Preferably, the data transmission module is composed of a wireless sensor network, the wireless sensor network adopts a routing mechanism based on genetic algorithm,defining the initial path of a network node to be Hj={h1,h2,...,hpAnd then, defining a fitness function in the algorithm as:
Figure GDA0002723603030000011
wherein s isjIs the residual energy of node j, c (h)j) Is path hjPath length of (e), e (h)j) Is path hjThe inventor gives empirical values for the three weights according to a large amount of field practices, and the three weights are respectively: 0.3, 0.2, 0.5.
Preferably, the acquired parameter data includes horizontal displacement of the bridge structure, lateral displacement, stress of the concrete structure portion of the bridge, and stress of the steel structure portion of the bridge.
Preferably, the data processing module is configured to perform modification and average calculation on the raw data.
Preferably, the bridge structure damage early warning module comprises a deformation evaluation submodule, a stress evaluation submodule and a comprehensive early warning submodule.
The invention has the beneficial effects that: the method can be used for identifying the damage condition of the bridge structure in real time and efficiently, and the accuracy of the bridge structure identification system is improved.
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The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a schematic view of the structural connection of the present invention;
fig. 2 is a schematic diagram of a bridge structure early warning module according to the present invention.
Reference numerals:
the system comprises a data mining module 1, a data transmission module 2, a data processing module 3, a damage early warning module 4, a deformation evaluation submodule 41, a stress evaluation submodule 42 and a comprehensive early warning submodule 43.
Detailed Description
The invention is further described with reference to the following examples.
Referring to fig. 1 and fig. 2, the efficient bridge structure damage identification system of the embodiment includes a data mining module 1, a data transmission module 2, a data processing module 3, and a damage early warning module 4; the data mining module 1 acquires original data affecting a bridge structure through a sensor and transmits the original data to the data processing module 3 through the data transmission module 2; the data processing module 3 is used for processing the received data; and the damage early warning module 4 is used for evaluating the damage condition of the bridge structure according to the processed data.
Preferably, the data transmission module 2 is formed by a wireless sensor network, the wireless sensor network adopts a routing mechanism based on a genetic algorithm, and an initial path defining a network node is Hj={h1,h2,...,hpAnd then, defining a fitness function in the algorithm as:
Figure GDA0002723603030000021
wherein s isjIs the residual energy of node j, c (h)j) Is path hjPath length of (e), e (h)j) Is path hjThe inventor gives empirical values for the three weights according to a large amount of field practices, and the three weights are respectively: 0.3, 0.2, 0.5.
Compared with the prior art, the embodiment provides a routing mechanism based on a genetic algorithm, and the selected fitness function fully considers the path length of the node, the energy consumption and the residual energy consumption of the node, so that an optimal transmission path is formulated, the energy consumption of a bridge structure damage identification system is greatly reduced, and the service life of the system is prolonged.
Preferably, the acquired parameter data comprises horizontal displacement and transverse displacement of the bridge structure, stress of the concrete structure part of the bridge and stress of the steel structure part of the bridge.
Preferably, the data processing module 3 processes the data by using a data correction and averaging algorithm, and specifically includes: the data acquired by the sensor nodes are corrected, so that the influence of the ambient temperature on the data acquisition is eliminated, and the formula is as follows:
Figure GDA0002723603030000031
in the formula (I), the compound is shown in the specification,
Figure GDA0002723603030000032
in order to obtain the corrected data, the data is,
Figure GDA0002723603030000033
for the original data before correction, T0Using a standard temperature for the sensor, and using T as the actual environment temperature when the sensor is used;
the embodiment corrects the data, eliminates the measurement error caused by the ambient temperature when the sensor collects the data, and increases the accuracy of the bridge structure damage identification system.
As another preferred embodiment, the performing an averaging algorithm on the sensor data specifically includes:
setting the data collected at a certain moment i as yiProcessing the data by adopting a data weighted moving average algorithm, and obtaining processed data y'iComprises the following steps:
Figure GDA0002723603030000034
in the formula, σ1、σ2、σ3Respectively corresponding weight factors.
In the embodiment, the weighted moving average algorithm is adopted to process the data, so that the influence of an abnormal point on the accuracy of the system is avoided to a certain extent, and the accuracy of the evaluation result of the bridge structure early warning module is improved.
Preferably, the bridge structure early warning module 4 includes a deformation evaluation submodule 41, a stress evaluation submodule 42 and a comprehensive early warning submodule 43.
Preferably, the deformation evaluation sub-module 41 is configured to evaluate a deformation degree of the bridge structure according to the horizontal displacement and the lateral displacement obtained by the modules, and specifically includes:
a. and establishing a deformation evaluation submodule based on a fuzzy algorithm, setting upper and lower limit values for each input variable by taking horizontal displacement and transverse displacement as input variables, respectively establishing corresponding weights according to the influence degree of each input variable on the deformation degree of the bridge structure, and defining the same fuzzy state, namely 'serious', 'slight' and 'normal' for the input variables. The deformation degree of the bridge structure is taken as an output quantity, and three fuzzy states, namely 'serious', 'mild' and 'normal', are defined for the deformation degree;
b. according to historical data of horizontal displacement and transverse displacement of the bridge structure collected over the years, a fuzzy rule for reasoning the deformation degree of the bridge structure by taking the horizontal displacement and the transverse displacement as the basis is formulated;
c. inputting variable values, judging sensor faults when the variable values exceed the upper limit range and the lower limit range, reasoning and obtaining membership degrees of all input variables in a fuzzy set according to fuzzy rules when the variable values are in the ranges, and calculating the deformation degree b (i) of the bridge structure by setting the data of the horizontal displacement value and the transverse displacement acquired at the ith moment as P (i) and L (i) respectively:
b(i)=γ1μ(p)+γ2μ(l)
wherein, γ1And μ (p) are the weight and degree of membership, γ, respectively, of the horizontal shift P (i)2And μ (l) are the weight and degree of membership, respectively, of the lateral shift L (i);
compared with the prior art, the bridge structure monitoring and evaluating submodule 41 based on the fuzzy algorithm provided by the preferred embodiment obtains the deformation degree of the bridge structure by using a fuzzy evaluation model to reason according to the horizontal displacement and the transverse displacement which affect the deformation of the bridge structure, better handles the problems of fuzziness, subjective judgment and the like, and effectively diagnoses the deformation degree of the bridge structure;
preferably, the stress evaluation sub-module 42 is configured to evaluate the stress state of the bridge structure according to the stress of the concrete structure part of the bridge and the stress of the steel structure part of the bridge obtained by the above modules, and specifically includes:
A. establishing a stress evaluation submodule based on a fuzzy algorithm, setting upper and lower limit values for each input variable by taking stress and stress as input variables, respectively establishing corresponding weights according to the influence of each input variable on the stress state of the bridge structure, and defining the same fuzzy state, namely high, normal and low, for the input variables. Defining three fuzzy states, namely high, normal and low, of the stress state by taking the stress state of the bridge structure as an output quantity;
B. according to historical data collected over the years, establishing a fuzzy rule for reasoning the stress state of the bridge structure by taking the stress of the concrete structure part of the bridge and the stress of the steel structure part of the bridge as the basis;
C. inputting variable values, judging the faults of the sensors when the variable values exceed the upper limit range and the lower limit range, reasoning and obtaining the membership degree of each input variable in fuzzy concentration according to a fuzzy rule when the variable values are in the range, and calculating the stress state q (i) of the bridge structure by setting the stress of the bridge concrete part and the stress of the bridge steel structure part acquired at the ith moment as Y (i) and R (i) respectively:
q(i)=ρ1μ(y)+ρ2μ(r)
where ρ is1And μ (y) is the weight and degree of membership, ρ, of the stress Y (i), respectively2And μ (r) is the weight and degree of membership, respectively, of stress R (i);
compared with the prior art, the stress evaluation submodule 42 based on the fuzzy algorithm provided by the preferred embodiment obtains the stress state of the bridge structure by using a fuzzy evaluation model to reason according to the stress of different parts of the bridge influencing the stress state of the bridge, better handles the problems of fuzziness, subjective judgment and the like, and effectively diagnoses the stress state of the bridge structure;
preferably, the comprehensive early warning sub-module 43 is used for further comprehensively evaluating the damage condition of the bridge structure according to the deformation degree b (i) and the stress state q (i) of the bridge structure,
defining the damage evaluation coefficient of the bridge structure as follows:
Figure GDA0002723603030000051
wherein mu and sigma are weights of the deformation degree of the bridge structure and the influence degree of the stress state on the damage condition of the bridge structure, which are determined according to historical data, respectively, and k represents the number of the deformation degree b (i) and the stress condition q (i) obtained within 2 hours;
the method comprises the following steps of formulating a boundary value theta of the early warning level of the bridge structure according to the monitoring data of the past year, and dividing different early warning levels according to the relation between an evaluation coefficient and the boundary value, wherein the method specifically comprises the following steps:
Figure GDA0002723603030000052
the comprehensive early warning submodule 43 provided in the preferred embodiment performs comprehensive early warning on the bridge structure according to the obtained deformation degree and stress state of the bridge structure, and compared with the prior art, analyzes the damage condition of the bridge structure aiming at the diversity of factors affecting the damage of the bridge structure, and forms a relatively comprehensive and accurate early warning system for the damage of the bridge structure.
Based on the above embodiment, a series of tests were performed according to different parameter information in the database, and the following are evaluation results obtained by the tests:
Figure GDA0002723603030000053
finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (4)

1. An efficient bridge structure damage identification system is characterized in that: the system comprises a data mining module, a data transmission module, a data processing module and a damage early warning module; the data mining module acquires original data influencing a bridge structure through a sensor and transmits the original data to the data processing module through the data transmission module; the data processing module is used for processing the received data; the damage early warning module is used for evaluating the damage condition of the bridge according to the processed data; the damage early warning module comprises a deformation evaluation submodule, a stress evaluation submodule and a comprehensive early warning submodule, wherein the deformation evaluation submodule is used for evaluating the deformation degree of the bridge structure according to the processed horizontal displacement and the processed transverse displacement, and specifically comprises the following steps:
a. establishing a deformation evaluation submodule based on a fuzzy algorithm, setting upper and lower limit values for each input variable by taking horizontal displacement and transverse displacement as input variables, respectively making corresponding weights according to the influence degree of each input quantity on the deformation degree of the bridge structure, defining the same fuzzy state, namely 'serious', 'slight' and 'normal' for the input variables, and defining three fuzzy states, namely 'serious', 'slight' and 'normal' for the deformation degree by taking the deformation degree of the bridge structure as an output quantity;
b. according to historical data of horizontal displacement and transverse displacement of the bridge structure collected over the years, a fuzzy rule for reasoning the deformation degree of the bridge structure by taking the horizontal displacement and the transverse displacement as the basis is formulated;
c. inputting variable values, judging sensor faults when the variable values exceed the upper limit range and the lower limit range, reasoning and obtaining membership degrees of all input variables in a fuzzy set according to fuzzy rules when the variable values are in the ranges, and calculating the deformation degree b (i) of the bridge structure by setting the data of the horizontal displacement value and the transverse displacement acquired at the ith moment as P (i) and L (i) respectively:
b(i)=γ1μ(p)+γ2μ(l)
wherein, γ1And μ (p) are the weight and degree of membership, γ, respectively, of the horizontal shift P (i)2And μ (l) are the weight and degree of membership, respectively, of the lateral shift L (i); the stress evaluation submodule is used for evaluating the stress state of the bridge structure according to the stress of the processed bridge concrete structure part and the stress of the bridge steel structure part, and specifically comprises:
A. establishing a stress evaluation submodule based on a fuzzy algorithm, setting upper and lower limit values for each input variable by taking stress and stress as input variables, respectively making corresponding weights according to the influence of each input quantity on the stress state of the bridge structure, defining the same fuzzy state, namely high, normal and low, for the input variables, and defining three fuzzy states, namely high, normal and low, for the stress state by taking the stress state of the bridge structure as an output quantity;
B. according to historical data collected over the years, establishing a fuzzy rule for reasoning the stress state of the bridge structure by taking the stress of the concrete structure part of the bridge and the stress of the steel structure part of the bridge as the basis;
C. inputting variable values, judging the faults of the sensors when the variable values exceed the upper limit range and the lower limit range, reasoning and obtaining the membership degree of each input variable in fuzzy concentration according to a fuzzy rule when the variable values are in the range, and calculating the stress state q (i) of the bridge structure by setting the stress of the bridge concrete part and the stress of the bridge steel structure part acquired at the ith moment as Y (i) and R (i) respectively:
q(i)=ρ1μ(y)+ρ2μ(r)
where ρ is1And μ (y) is the weight and degree of membership, ρ, of the stress Y (i), respectively2And μ (r) is the weight and degree of membership, respectively, of stress R (i); the comprehensive early warning sub-module is used for further comprehensively warning the damage condition of the bridge structure according to the deformation degree b (i) and the stress state q (i) of the bridge structureThe evaluation was carried out by the following method,
defining the damage evaluation coefficient of the bridge structure as follows:
Figure FDA0002723603020000021
wherein mu and sigma are weights of the deformation degree of the bridge structure and the influence degree of the stress state on the damage condition of the bridge structure, which are determined according to historical data, respectively, and k represents the number of the deformation degree b (i) and the stress condition q (i) obtained within 2 hours;
the method comprises the following steps of formulating a boundary value theta of the early warning level of the bridge structure according to the monitoring data of the past year, and dividing different early warning levels according to the relation between an evaluation coefficient and the boundary value, wherein the method specifically comprises the following steps:
Figure FDA0002723603020000022
2. the system of claim 1, wherein the system is further characterized by: the data transmission module is composed of a wireless sensor network, the wireless sensor network adopts a routing mechanism based on a genetic algorithm, and the initial path of a network node is defined as Hj={h1,h2,...,hpAnd then, defining a fitness function in the algorithm as:
Figure FDA0002723603020000023
wherein s isjIs the residual energy of node j, c (h)j) Is path hjPath length of (e), e (h)j) Is path hjThe inventor gives empirical values for the three weights according to a large amount of field practices, and the three weights are respectively: 0.3, 0.2, 0.5.
3. The system of claim 2, wherein the system is further characterized by: the data collected includes horizontal displacement of the bridge structure, lateral displacement, stress of the concrete structural portion of the bridge, and stress of the steel structural portion of the bridge.
4. The system of claim 3, wherein the system is further characterized by: and the data processing module is used for correcting and averaging the original data.
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