CN118211310A - Bridge hollow slab transverse connection state evaluation method, system and storage medium based on mean shift accumulation degree - Google Patents
Bridge hollow slab transverse connection state evaluation method, system and storage medium based on mean shift accumulation degree Download PDFInfo
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Abstract
The invention discloses a bridge hollow slab transverse connection state evaluation method, a system and a storage medium based on mean shift accumulation degree, which comprise the following contents: (1) Obtaining the actual measurement displacement of the bridge hollow slab through a displacement sensor, and calculating the average value accumulated displacement degree of the actual measurement displacement on a time sequence; (2) Calculating a load transverse distribution coefficient through the average displacement accumulation degree, calculating a load transverse distribution change coefficient according to the load transverse distribution coefficient, and taking the ratio of the actually measured transverse distribution change coefficient to the initial transverse distribution change coefficient as a hinge joint evaluation coefficient index; (3) Comparing the actually measured hinge joint evaluation coefficient index with a preset safety threshold value, and carrying out maintenance work on the hinge joint when the hinge joint evaluation coefficient index exceeds the threshold value range. According to the invention, the hinge joint health state evaluation index is established through the mean shift accumulation degree, so that the health condition of the hinge joint at the joint of the hollow slab can be timely and effectively judged, and a basis is provided for the transportation and maintenance of the bridge hinge joint.
Description
Technical Field
The invention relates to the field of bridge engineering, in particular to a bridge hollow slab transverse connection state evaluation method, system and storage medium based on mean shift accumulation.
Technical Field
For hollow deck bridge structures, the safety and durability of the hinge joint plays an important role in the transmission of structural transverse forces. Firstly, the hinge joint can allow the structure to deform under the stress and temperature change without affecting the stability of the whole structure, so that the stress concentration in the structure can be reduced, and the deformation and displacement of the structure are facilitated; secondly, the hinge joints are connected with components in the structure, and play a role in supporting and stabilizing the structure, so that all parts of the structure can work cooperatively; finally, the hinge joint can be adaptively deformed under the conditions of structural stress change or material aging and the like, so that the stability and the integrity of the structure are maintained. Therefore, the health state evaluation of the hinge joint has important significance, and problems can be found and measures can be taken early by periodically evaluating the health state of the hinge joint, so that the service life of the structure is prolonged, and the maintenance cost is reduced; by means of hinge joint health state evaluation, scientific decisions can be made according to actual data, maintenance and repair schemes of the structure are determined, and reliability and stability of the structure are improved.
The traditional hinge joint evaluation method comprises the following steps: visual inspection, physical parameter measurement, structural testing, and structural health monitoring index assessment. The visual inspection is to observe whether the appearance of the hinge joint is cracked, deformed, corroded and the like through manual visual inspection, and primarily evaluate the health condition of the hinge joint; the physical parameter measurement adopts a tool to perform physical parameter measurement on the hinge joint, such as acquisition and analysis of data of strain, displacement and the like, so as to acquire deformation information of the hinge joint and evaluate the state of the hinge joint; the structural test adopts a static load test or a dynamic test, and tests and analyzes the overall performance of the structure, the bearing capacity and the deformation characteristic of the hinge joint, and evaluates the state and the health degree of the hinge joint; the structural health monitoring and evaluating method is to monitor vibration, temperature, deformation and other data of the structure in real time by adopting a sensor network and a monitoring system, and evaluate the health state of the hinge joint by analyzing the data. The above method has certain defects: requires experienced technicians; spending a lot of time and manpower; the latest detection equipment needs to be purchased, and the economic cost is too high; standard health monitoring systems need to be built.
Aiming at the requirements of national provincial bridge health monitoring with large quantity and large body quantity, if the bridge hinge joint evaluation method is adopted, a great amount of economic cost is generated, and in order to control the cost and accurately and quickly acquire the evaluation information of the hinge joint performance state, a quick and convenient evaluation method is needed to be provided.
Disclosure of Invention
The invention aims to: aiming at the defects in the prior art, the invention provides a bridge hollow slab transverse connection state evaluation method, a system and a storage medium based on the mean shift accumulation degree, which can evaluate the health state of a bridge hollow slab hinge joint through bridge shift data and provide a basis for the maintenance behavior of the hinge joint.
The technical scheme is as follows: a bridge hollow slab transverse connection state evaluation method based on mean shift accumulation degree comprises the following steps:
(1) Obtaining actual measurement displacement of bridge hollow slab through displacement sensor Calculating the actual measurement displacementMean cumulative displacement over time series; The displacement sensors are arranged below the hollow slab, and are positioned at the same cross section position of the bridge; the displacement sensor can be arranged at any span of the non-support position, and is preferably arranged at the main beam midspan position;
Preferably, the actually measured displacement is the displacement when the heavy vehicle passes through, and the actually measured displacement value has a trough in the corresponding time period;
(2) Cumulative degree by mean shift Calculating the transverse distribution coefficient of loadAccording to the transverse distribution coefficient of loadCalculating the transverse distribution change coefficient of loadBy actually measuring the transverse distribution change coefficientAnd an initial lateral distribution coefficient of variationIs taken as the index of hinge joint evaluation coefficientThe hinge joint evaluation coefficient indexIs used for judging different damage states of the hinge joint,The closer to 1, the safer the corresponding hinge joint;
(3) Hinge joint evaluation coefficient index of the i-th hinge joint obtained by actual measurement Comparing with a preset safety threshold value, and evaluating coefficient index when the hinge joint is evaluatedAnd when the safety threshold value is exceeded, maintaining the hinge joints, wherein i is more than or equal to 1 and less than or equal to N, and N is the number of the hinge joints.
In one embodiment, the step (1) specifically includes the following:
the bridge comprises N+1 hollow plates, wherein the N+1 hollow plates form N transverse connecting hinge joints;
assuming that the state of the ith hinge joint needs to be evaluated, the two adjacent hollow plates corresponding to the ith hinge joint are respectively an nth hollow plate and an n+1th hollow plate, and i is more than or equal to 1 and less than or equal to N; n is more than or equal to 1 and less than or equal to N+1;
the sampling frequency of the displacement sensor is According to the preset speed, the time for the heavy truck to completely pass through the displacement sensor is set as t seconds, and the actual measurement displacement of the two hollow plates corresponding to the ith hinge joint in t seconds is respectivelyAnd，，WhereinAndRespectively representing the g measured displacement of the two hollow plates corresponding to the i-th hinge joint in t seconds, wherein；
Calculating the actual measurement displacementAverage cumulative displacement over time sequence:
；
Wherein, The cumulative mean shift over time t is shown for the nth hollow slab.
In one embodiment, the step (2) specifically includes the following:
(2.1) calculating the load transverse distribution coefficient of the hollow slab by adopting the average displacement accumulation degree:
；
Wherein, Representing the load transverse distribution coefficient of the nth hollow slab; Representing the cumulative degree of mean shift of the nth hollow slab over time t;
(2.2) acquiring a load transverse distribution change coefficient:
；
Wherein, Representing the load transverse distribution change coefficient of two adjacent hollow plates of the ith hinge joint; Representing the center distance between the nth hollow plate and the (n+1) th hollow plate;
(2.3) constructing a hinge joint evaluation coefficient for evaluating the degree of damage at a hinge joint ：
；
Wherein,Representing the measured transverse distribution change coefficient; representing the initial lateral distribution coefficient of variation.
In one embodiment, the safety threshold value in step (3) is calculated as follows:
measuring the actually measured hinge joint evaluation coefficient under the k groups of safety states, and defining the safety threshold of the ith hinge joint as follows:
；
；
Wherein, Is the average value of hinge joint evaluation coefficients of the ith hinge joint which is actually measured in the k groups of historical safety states and is larger than 1,Is the average value of hinge joint evaluation coefficients of which the i-th hinge joint is actually measured in k groups of historical safety states and is less than or equal to 1,A standard deviation of a hinge joint evaluation coefficient of which the i-th hinge joint is actually measured in a k-group safety state and is larger than 1; a standard deviation of a hinge joint evaluation coefficient which is smaller than or equal to 1 and is actually measured in the k groups of safety states;
When the hinge joint evaluation coefficient to be evaluated Or alternativelyWhen in use, the hinge joint has potential safety hazard.
A system for performing the bridge hollow slab lateral contact status assessment method, comprising:
the displacement acquisition and processing unit is used for acquiring actual measurement displacement of the bridge hollow slab Calculating the actual measurement displacementMean cumulative displacement over time series；
Hinge joint evaluation index calculation unit for accumulating degree through mean value displacementCalculating the transverse distribution coefficient of loadAccording to the transverse distribution coefficient of loadCalculating the transverse distribution change coefficient of loadBy actually measuring the transverse distribution change coefficientAnd an initial lateral distribution coefficient of variationIs taken as the index of hinge joint evaluation coefficient；
A state evaluation unit for evaluating the hinge joint evaluation coefficient index of the i-th hinge jointComparing the current hinge joint evaluation coefficient index with a preset safety threshold value, and judging the current hinge joint evaluation coefficient indexIf the safety threshold is exceeded, i is more than or equal to 1 and less than or equal to N, wherein N is the number of hinge joints.
A computer readable storage medium storing at least one executable instruction that, when executed on an electronic device, causes the electronic device to perform the bridge hollow slab lateral contact status assessment method.
Compared with the prior art, the invention has the following remarkable progress:
1. According to the invention, the dynamic deformation of two adjacent beams of the hinge joint is obtained in real time through the sensor, the bridge deformation is described by the dynamic displacement of the bridge hollow slab, and a hinge joint health state evaluation system based on the average displacement accumulation degree is constructed, so that the health condition of the hinge joint is accurately and rapidly judged. Compared with the existing mode of obtaining displacement by adopting static displacement or dynamic acceleration integration, the method directly adopts dynamic displacement to carry out integration treatment to obtain the average displacement accumulation degree, and the method avoids the influence on measurement precision caused by the problems of asynchronous displacement recording time or special jump points and the like in the static displacement obtaining path and also avoids the defect of inaccurate displacement obtaining by acceleration integration; according to the invention, through the dynamic data acquisition for a period of time, the displacement conditions of different hollow plates in the period of time can be reflected, and the real-time state of the hollow plates can be reflected more accurately, so that the hinge joint with large damage degree can be found accurately and timely.
2. The invention can complete the hinge joint health state assessment timely and rapidly by means of the existing bridge sensor network and monitoring system, does not need to add a cloth sensor device or carry out an additional test, can reduce the hinge joint assessment cost, is easy to popularize and implement, and provides great support for the maintenance and the management of the hinge joints.
Drawings
FIG. 1 is a flow chart of a method for evaluating the lateral link status of a hollow slab of a bridge based on the cumulative mean shift in an embodiment.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings.
In a first aspect, the invention adopts displacement to represent and describe the deformation degree of a bridge, and provides a bridge hollow slab transverse connection state evaluation method based on average displacement accumulation degree, which comprises the following steps:
(1) Monitoring bridge deformation through a sensor, and describing the bridge deformation by actually measuring displacement of the hollow slab, which is acquired by a displacement sensor; the displacement sensor is arranged below the hollow slab and used for acquiring dynamic actually measured displacement of the bridge hollow slab in real time Calculate the actual measurement displacementMean cumulative displacement over time series; It should be noted that the arrangement of the plurality of displacement sensors needs to be kept at the same cross section of the bridge, and the measurement positions of the displacement sensors can be midspan or quarter span or any other span, but cannot be arranged at or near the support; preferably mounted in a main girder mid-span position;
(2) Cumulative degree by mean shift Calculating the transverse distribution coefficient of loadAccording to the transverse distribution coefficient of loadCalculating the transverse distribution change coefficient of loadBy actually measuring the transverse distribution change coefficientAnd an initial lateral distribution coefficient of variationIs taken as the index of hinge joint evaluation coefficientHinge joint evaluation coefficient indexIs used for judging different damage states of the hinge joint,The closer to 1, the safer the corresponding hinge joint;
(3) Actually measured hinge joint evaluation coefficient index Comparing with a preset safety threshold value, and evaluating coefficient index when the hinge joint is evaluatedWhen the hinge joint exceeds the threshold range, the hinge joint is considered to have potential safety hazards, and immediate safety investigation is needed.
The measurement position of the present embodiment is the midspan, and details of each step are described in detail with reference to fig. 1.
The process of step (1) is as follows:
a bridge consists of N+1 hollow plates, and N transverse connecting hinge joints are arranged on the bridge. Assuming that the state of the ith hinge joint needs to be evaluated, the two adjacent hollow plates corresponding to the ith hinge joint are respectively an nth hollow plate and an n+1th hollow plate, and i is more than or equal to 1 and less than or equal to N; n is more than or equal to 1 and less than or equal to N+1.
Assuming that the sampling frequency of the displacement sensor is 10HZ, the time for the heavy truck to completely pass through the sensor is set to be 2 seconds according to the general speed regulation, and the measured deflection of the two hollow plates corresponding to the ith hinge joint is calculated to be respectivelyAndWhereinAndThe data point included was 20. It should be noted that the actual displacement is the displacement when the heavy vehicle passes through, and the actual displacement value has a trough in the period of time.
Based on which the displacement is proposedMean shift cumulative degree over time sequence:
；
Wherein the method comprises the steps of The cumulative mean shift over time 2 seconds for the nth hollow slab is shown.
The process of step (2) is as follows:
(2.1) adopting the average displacement accumulation degree to approximately obtain the load transverse distribution coefficient of the hollow slab:
；
Wherein, Representing the load transverse distribution coefficient of the nth hollow slab; Representing the cumulative degree of mean shift of the nth hollow slab over time t; n+1 represents the number of hollow plates.
(2.2) Acquiring a load transverse distribution change coefficient:
；
Wherein, Representing the load transverse distribution change coefficient of the i-th hinge joint adjacent hollow slab; the center distance of the n hollow plates from the n+1th hollow plate is shown.
(2.3) Constructing a hinge joint evaluation coefficient based on the load transverse distribution change coefficient：
；
Wherein,Representing the actually measured transverse distribution change coefficient, namely the actually measured load transverse distribution change coefficient of two adjacent hollow plates, which is calculated according to the steps (1), 2.1 and 2.2 in the damaged state；The initial transverse distribution change coefficient is represented, and is the hollow slab load transverse distribution change coefficient measured by a bridge forming test or the hollow slab load transverse distribution change coefficient in an undamaged state calculated by an initial model or the hollow slab load transverse distribution change coefficient obtained by the actual measurement of a first test.
In the step (3), according to the load transverse distribution coefficient slope index of the actually measured ith hinge jointJudging the damaged state of the hinge joint, whereinThe larger the hinge joint damage degree is, the higher the corresponding hinge joint damage degree is, the deviation of the actually measured hinge joint evaluation coefficient can be generated under different load conditions, and when the hinge joint evaluation coefficient exceeds a preset safety threshold value, the hinge joint needs to be maintained in time; the safety threshold can be calculated as follows:
the method comprises the steps of determining an actually measured hinge joint evaluation coefficient under a k-group safety state, and defining a safety threshold of an ith hinge joint as follows:
；
；
Wherein, Is the average value of hinge joint evaluation coefficients of the ith hinge joint which is actually measured in the k groups of historical safety states and is larger than 1,Is the average value of hinge joint evaluation coefficients of which the i-th hinge joint is actually measured in k groups of historical safety states and is less than or equal to 1,A standard deviation of a hinge joint evaluation coefficient of which the i-th hinge joint is actually measured in a k-group safety state and is larger than 1; a standard deviation of a hinge joint evaluation coefficient which is smaller than or equal to 1 and is actually measured in the k groups of safety states;
，，；
，， a hinge joint evaluation coefficient which is larger than 1 and indicates the ith hinge joint in actual measurement under the safe state of the I group, ；A hinge joint evaluation coefficient of 1 or less for the i-th hinge joint under the actual measurement in the safe state of the J-th group,。
When evaluating coefficient to be evaluatedAnd when the hinge joint is considered to have potential safety hazards, the safety check is needed immediately.
In a second aspect, the present invention proposes a system for performing the above method for evaluating a bridge hollow slab lateral contact state, comprising:
the displacement acquisition and processing unit is used for acquiring actual measurement displacement of the bridge hollow slab Calculating the actual measurement displacementMean cumulative displacement over time series；
Hinge joint evaluation index calculation unit for accumulating degree through mean value displacementCalculating the transverse distribution coefficient of loadAccording to the transverse distribution coefficient of loadCalculating the transverse distribution change coefficient of loadBy actually measuring the transverse distribution change coefficientAnd an initial lateral distribution coefficient of variationIs taken as the index of hinge joint evaluation coefficient；
A state evaluation unit for evaluating the hinge joint evaluation coefficient index of the i-th hinge jointComparing the current hinge joint evaluation coefficient index with a preset safety threshold value, and judging the current hinge joint evaluation coefficient indexIf the safety threshold is exceeded, i is more than or equal to 1 and less than or equal to N, wherein N is the number of hinge joints.
In a third aspect, the present invention further provides a computer readable storage medium, where at least one executable instruction is stored, where the executable instruction when executed on an electronic device causes the electronic device to execute a process of the bridge hollow slab lateral contact state evaluation method described above.
Those skilled in the art will appreciate that the present invention may be implemented as a system, method, or computer program product. Accordingly, the present disclosure may be embodied in the following forms, namely: either entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or entirely software, or a combination of hardware and software, referred to herein generally as a "circuit," module "or" system. Furthermore, in some embodiments, the invention may also be embodied in the form of a computer program product in one or more computer-readable media, which contain computer-readable program code.
The foregoing embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same according to the present invention, not to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (8)
1. The bridge hollow slab transverse connection state evaluation method based on the mean shift accumulation degree is characterized by comprising the following steps of:
(1) Obtaining actual measurement displacement of bridge hollow slab through displacement sensor Calculate the measured displacement/>Mean cumulative displacement over time sequence/>; The displacement sensors are arranged below the hollow slab and are arranged at any span of the non-support position, and each displacement sensor is positioned at the same cross section position of the bridge;
(2) Cumulative degree by mean shift Calculating the transverse distribution coefficient/>According to the transverse distribution coefficient/>Calculating the transverse distribution change coefficient/>With measured transversal distribution coefficient of variation/>And initial lateral distribution coefficient of variation/>Is taken as the hinge joint evaluation coefficient index/>The hinge joint evaluation coefficient index/>Used for judging different damage states of the hinge joint;
(3) Hinge joint evaluation coefficient index of the i-th hinge joint obtained by actual measurement Comparing with a preset safety threshold value, and when the hinge joint evaluation coefficient index/>And when the safety threshold value is exceeded, maintaining the hinge joints, wherein i is more than or equal to 1 and less than or equal to N, and N is the number of the hinge joints.
2. The method for evaluating the transverse connection state of the bridge hollow slab based on the mean displacement accumulation degree according to claim 1, wherein the actually measured displacement is the displacement when a heavy vehicle passes through, and the actually measured displacement value has a trough in the corresponding time period.
3. The method for evaluating the transverse connection state of the bridge hollow slab based on the mean shift accumulation degree according to claim 2, wherein the step (1) specifically comprises the following steps:
the bridge comprises N+1 hollow plates, wherein the N+1 hollow plates form N transverse connecting hinge joints;
assuming that the state of the ith hinge joint needs to be evaluated, the two adjacent hollow plates corresponding to the ith hinge joint are respectively an nth hollow plate and an n+1th hollow plate, and i is more than or equal to 1 and less than or equal to N; n is more than or equal to 1 and less than or equal to N+1;
the sampling frequency of the displacement sensor is According to the preset speed, setting the time for the heavy truck to completely pass through the displacement sensor as t seconds, and measuring the actual measurement displacement of the two hollow plates corresponding to the ith hinge joint in the t seconds as/>, wherein the actual measurement displacement is respectivelyAnd/>，，/>Wherein/>And/>Respectively represents the g measured displacement of the two hollow plates corresponding to the i-th hinge joint in t seconds, wherein/>；
Calculating the actual measurement displacementAverage cumulative displacement over time sequence:
；
Wherein, The cumulative mean shift over time t is shown for the nth hollow slab.
4. The method for evaluating the transverse connection state of the bridge hollow slab based on the mean shift accumulation degree according to claim 3, wherein the step (2) specifically comprises the following steps:
(2.1) calculating the load transverse distribution coefficient of the hollow slab by adopting the average displacement accumulation degree:
；
Wherein, Representing the load transverse distribution coefficient of the nth hollow slab; /(I)Representing the cumulative degree of mean shift of the nth hollow slab over time t;
(2.2) acquiring a load transverse distribution change coefficient:
；
Wherein, Representing the load transverse distribution change coefficient of two adjacent hollow plates of the ith hinge joint; /(I)Representing the center distance between the nth hollow plate and the (n+1) th hollow plate;
(2.3) constructing a hinge joint evaluation coefficient for evaluating the degree of damage at a hinge joint ：
；
Wherein,Representing the measured transverse distribution change coefficient; /(I)Representing the initial lateral distribution coefficient of variation.
5. The method for evaluating the lateral link state of the bridge hollow slab based on the mean shift cumulative degree according to claim 4, wherein in the step (3), the safety threshold is calculated by:
measuring the actually measured hinge joint evaluation coefficient under the k groups of safety states, and defining the safety threshold of the ith hinge joint as follows:
；
；
Wherein, Is the average value of hinge joint evaluation coefficients of the ith hinge joint which is actually measured in the k groups of historical safety states and is larger than 1,Is the average value of hinge joint evaluation coefficients of which the i-th hinge joint is actually measured in k groups of historical safety states and is less than or equal to 1,/>A standard deviation of a hinge joint evaluation coefficient of which the i-th hinge joint is actually measured in a k-group safety state and is larger than 1; /(I)A standard deviation of a hinge joint evaluation coefficient which is smaller than or equal to 1 and is actually measured in the k groups of safety states;
When the hinge joint evaluation coefficient to be evaluated Or/>When in use, the hinge joint has potential safety hazard.
6. The method for evaluating the transverse link state of the bridge hollow slab based on the mean shift accumulation according to claim 1, wherein the shift sensor is arranged at the midspan position of the main beam.
7. A system for performing the bridge hollow slab lateral tie status assessment method of any one of claims 1-6, comprising:
the displacement acquisition and processing unit is used for acquiring actual measurement displacement of the bridge hollow slab Calculate the measured displacement/>Mean cumulative displacement over time sequence/>；
Hinge joint evaluation index calculation unit for accumulating degree through mean value displacementCalculating the transverse distribution coefficient/>According to the transverse distribution coefficient/>Calculating the transverse distribution change coefficient/>With measured transversal distribution coefficient of variation/>And initial lateral distribution coefficient of variation/>Is taken as the hinge joint evaluation coefficient index/>；
A state evaluation unit for evaluating the hinge joint evaluation coefficient index of the i-th hinge jointComparing the current hinge joint evaluation coefficient index with a preset safety threshold value, and judging the current hinge joint evaluation coefficient index/>If the safety threshold is exceeded, i is more than or equal to 1 and less than or equal to N, wherein N is the number of hinge joints.
8. A computer readable storage medium, wherein at least one executable instruction is stored in the storage medium, which when executed on an electronic device, causes the electronic device to perform the operations of the bridge hollow slab lateral contact state assessment method according to any one of claims 1 to 6.
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