A method, device and system for measuring deformation of arch ribs of long-span arch bridges

Abstract

The present application relates to the field of deformation measurement technology, and specifically to a method, device and system for measuring the deformation of the arch rib of a long-span arch bridge. The method comprises: collecting the inclination data of different monitoring points on the long-span arch bridge at different sampling times, determining the standard inclination data of the monitoring point and the local inclination data at the current sampling time; obtaining the adjusted inclination deformation at the same monitoring point at the current sampling time; marking the first monitoring point and the second monitoring point, obtaining the lag similarity of the first monitoring point at the current sampling time, adjusting the initial value of the preset parameter K, and obtaining the adjusted initial value at the first monitoring point at the current sampling time; calculating the bridge deflection according to the adjusted initial values ​​of all monitoring points, and obtaining the deformation of the arch rib of the long-span arch bridge. The present application solves the problem that the extracted inclination data is inaccurate, resulting in insufficient accuracy in monitoring the deformation of the arch rib.

Description

Technical Field

[0001] The present application relates to the technical field of deformation measurement, and in particular to a method, a measuring device and a system for measuring the deformation of an arch rib of a large-span arch bridge. Background Art

[0002] In an arch bridge structure, the main load-bearing component is the arch rib, and the condition of the arch rib directly affects the safety of the bridge structure. When the load-bearing structure of the arch rib is damaged, the arch bridge is very prone to safety accidents. Therefore, it is necessary to focus on monitoring the deformation of the arch rib and evaluate the bearing capacity of the bridge during the state assessment of the arch bridge structure. The inclination method is generally used to monitor the deformation of the arch rib to obtain the deformation angle of the arch rib and the deformation of the arch rib deflection. However, the detection accuracy of the inclination method is affected by the accuracy of the inclination data collected by the inclination sensor. Therefore, it is generally necessary to extract the collected inclination data, extract the inclination data at the time when the arch rib deformation may occur, and improve the accuracy of the arch rib deformation monitoring using the inclination method.

[0003] Generally, the LOF anomaly detection algorithm is used to detect abnormal data in the inclination data to ensure the accuracy of the inclination data after the abnormal data is removed. However, the abnormal data detection results obtained by the LOF anomaly detection algorithm are affected by the parameter K in the algorithm. When the parameter K of the LOF anomaly detection algorithm is too large, the anomaly detection process is not sensitive enough to the abnormal data and cannot identify all abnormal data; when the parameter K of the LOF anomaly detection algorithm is too small, the anomaly detection process is too sensitive to data fluctuations and is prone to misjudge normal fluctuation data as abnormal data. Therefore, unreasonable parameter selection of the LOF anomaly detection algorithm often makes the extracted inclination data at the moment when the arch rib deformation may occur inaccurate, resulting in insufficient accuracy in monitoring the arch rib deformation. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a method, device and system for measuring the deformation of the arch rib of a long-span arch bridge. The technical solutions adopted are as follows:

[0005] In a first aspect, an embodiment of the present application provides a method for measuring deformation of an arch rib of a long-span arch bridge, the method comprising the following steps:

[0006] Collect the inclination data of different monitoring points on the long-span arch bridge at the current sampling time and at different historical sampling times in the previous local time period, determine the standard inclination data of the monitoring point according to all the inclination data collected at the same monitoring point, and record the inclination data at the current sampling time and the second preset threshold sampling time before in the inclination data collected at the same monitoring point as the local inclination data at the current sampling time;

[0007] According to the difference between each local inclination data and the standard inclination data at the current sampling moment determined by the same monitoring point, the inclination deformation degree at the same monitoring point at the current sampling moment is obtained, and the adjustment inclination deformation degree at the same monitoring point at the current sampling moment is obtained by combining the difference between the inclination deformation degrees of the local inclination data at the current sampling moment determined by the same monitoring point and the time interval between the sampling moments corresponding to the local inclination data at the current sampling moment;

[0008] Record any monitoring point on the long-span arch bridge as the first monitoring point, record the monitoring point closest to the first monitoring point as the second monitoring point, and obtain the lag similarity of the first monitoring point at the current sampling time according to the difference between the adjusted inclination deformation at the same sampling time within the local time period of the current sampling time, the difference between the characteristic values ​​of the inclination deformation distribution, and the similarity between all local inclination data at the current sampling time determined by the first monitoring point and the second monitoring point. According to the relationship between the adjusted inclination deformation, the inclination deformation and the lag similarity at the first monitoring point at the current sampling time, adjust the initial value of the preset parameter K to obtain the adjusted initial value at the first monitoring point at the current sampling time;

[0009] The bridge deflection is calculated based on the adjusted initial values ​​of all monitoring points to obtain the arch rib deformation of the long-span arch bridge.

[0010] Furthermore, the specific process of determining the standard inclination data of the monitoring point is as follows:

[0011] The inclination data with the earliest sampling time among the inclination data collected at the same monitoring point is recorded as the standard inclination data of the monitoring point.

[0012] Furthermore, the construction process of the inclination deformation degree at the same monitoring point at the current sampling time is:

[0013] The absolute value of the difference between the local inclination data and the standard inclination data at the current sampling moment determined by the same monitoring point is recorded as the absolute difference of the local inclination data, and the linear normalized value of the cumulative sum of the absolute differences of all local inclination data determined by the same monitoring point at the current sampling moment is recorded as the inclination deformation degree at the same monitoring point at the current sampling moment.

[0014] Furthermore, the construction process of adjusting the tilt deformation degree at the same monitoring point at the current sampling time is:

[0015] For the same monitoring point, the local inclination data at the current sampling moment is recorded as the target local inclination data, the absolute value of the difference between the inclination deformation at the sampling moment corresponding to the target local inclination data and the inclination deformation at the previous sampling moment is recorded as the first absolute value of the target local inclination data, the time interval between the sampling moment corresponding to the target local inclination data and the current sampling moment is recorded as the time difference of the target local inclination data, and the ratio of the first absolute value of the target local inclination data to the time difference is recorded as the first ratio of the target local inclination data; a power with a natural constant as the base and the opposite number of the first ratio of the target local inclination data as the exponent is recorded as the first power value of the target local inclination data, and the cumulative sum of the first power values ​​of all local inclination data at the current sampling moment determined by the same monitoring point is recorded as the first cumulative sum at the same monitoring point at the current sampling moment;

[0016] The product of the mean value of the inclination deformation of all local inclination data determined at the same monitoring point at the current sampling time and the first cumulative sum at the same monitoring point at the current sampling time is recorded as the inclination deformation distribution characteristic value at the same monitoring point at the current sampling time;

[0017] The normalized value of the product of the inclination deformation degree and the inclination deformation distribution characteristic value at the same monitoring point at the current sampling time is recorded as the adjusted inclination deformation degree at the monitoring point at the current sampling time.

[0018] Further, the process of determining the lag similarity of the first monitoring point at the current sampling time is:

[0019] Arrange all local inclination data of the current sampling time determined by the same monitoring point in the time sequence of the sampling time to obtain the local inclination data sequence of the same monitoring point at the current sampling time; record the Pearson correlation coefficient between the local inclination data sequences of the first monitoring point and the second monitoring point at the current sampling time as the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling time;

[0020] The absolute value of the difference between the adjusted tilt deformation degrees at the first monitoring point and the second monitoring point at the same sampling moment before the current sampling moment is recorded as the second absolute value at the same sampling moment before the current sampling moment, a power with a natural constant as the base and the opposite number of the second absolute value at the same sampling moment before the current sampling moment as the exponent is recorded as the second power value of the target local tilt data at the same sampling moment before the current sampling moment, and the cumulative sum of the second power values ​​of the target local tilt data at the current sampling moment and a total of a second preset threshold number of sampling moments before and after is recorded as the second cumulative sum of the first monitoring point and the second monitoring point at the current sampling moment;

[0021] The absolute value of the difference between the tilt deformation distribution characteristic values ​​at the first monitoring point and the second monitoring point at the current sampling time is recorded as the third absolute value of the first monitoring point and the second monitoring point at the current sampling time;

[0022] The lag similarity of the first monitoring point at the current sampling moment is obtained according to the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling moment, the second cumulative sum and the third absolute value.

[0023] Further, the hysteresis similarity of the first monitoring point at the current sampling time is obtained according to the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling time, the second cumulative sum and the third absolute value. The specific process of obtaining is:

[0024] The product of the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling time and the second accumulated sum is recorded as the first product of the first monitoring point and the second monitoring point at the current sampling time;

[0025] A linear normalized value of the ratio of the first product of the first monitoring point and the second monitoring point at the current sampling time to the third absolute value is recorded as the lag similarity of the first monitoring point at the current sampling time.

[0026] Furthermore, the specific process of obtaining the adjusted initial value at the first monitoring point at the current sampling time is as follows:

[0027]

[0028] In the formula, Indicates that the current sampling time is at the first monitoring point The initial value of adjustment; Indicates the initial value of parameter K; Indicates that the current sampling time is at the first monitoring point Adjust the tilt angle deformation; Indicates that the current sampling time is at the first monitoring point The tilt deformation degree; Indicates the first monitoring point lagged similarity at the current sampling moment; Represents the ceiling function.

[0029] Furthermore, the bridge deflection is calculated based on the adjusted initial values ​​of all monitoring points to obtain the deformation of the arch rib of the long-span arch bridge. The specific process of obtaining is:

[0030] The adjusted initial value at the monitoring point at the current sampling time is used as the value of the parameter K of the inclination data collected by the monitoring point at the current sampling time, and the LOF anomaly detection algorithm is used to perform anomaly detection on all the inclination data collected at all monitoring points at the current sampling time to obtain anomaly detection results;

[0031] When the anomaly detection results contain abnormal data, the deformation of the arch rib of the long-span arch bridge is calculated based on the abnormal data according to the relationship between the rotation angle and the deflection curve of the bridge section;

[0032] When the anomaly detection result does not contain abnormal data, the arch rib deformation of the long-span arch bridge is 0.

[0033] In a second aspect, an embodiment of the present application provides an arch rib deformation measurement device for a large-span arch bridge, wherein the arch rib deformation measurement device includes: an inclination data acquisition module, an inclination data difference analysis module, a parameter adjustment module, and an arch rib deformation measurement module.

[0034] The inclination data collection module collects the inclination data of different monitoring points on the long-span arch bridge at the current sampling time and at different historical sampling times in the previous local time period, determines the standard inclination data of the monitoring point based on all the inclination data collected at the same monitoring point, and records the inclination data at the current sampling time and the second preset threshold sampling time before in the inclination data collected at the same monitoring point as the local inclination data at the current sampling time;

[0035] The inclination data difference analysis module is used to obtain the inclination deformation degree at the same monitoring point at the current sampling moment according to the difference between each local inclination data at the current sampling moment determined by the same monitoring point and the standard inclination data, and to obtain the adjusted inclination deformation degree at the same monitoring point at the current sampling moment in combination with the difference between the inclination deformation degrees of the local inclination data at the current sampling moment determined by the same monitoring point and the time interval between the sampling moments corresponding to the local inclination data at the current sampling moment;

[0036] A parameter adjustment module is used to record any monitoring point on the long-span arch bridge as the first monitoring point, record the monitoring point closest to the first monitoring point as the second monitoring point, obtain the lag similarity of the first monitoring point at the current sampling moment according to the difference between the adjusted inclination deformation at the same sampling moment in the local time period of the current sampling moment and the difference between the characteristic values ​​of the inclination deformation distribution, and the similarity between all local inclination data at the current sampling moment determined by the first monitoring point and the second monitoring point, adjust the initial value of the preset parameter K at the current sampling moment according to the relationship between the adjusted inclination deformation at the first monitoring point, the inclination deformation and the lag similarity, and obtain the adjusted initial value at the first monitoring point at the current sampling moment;

[0037] The arch rib deformation measurement module is used to calculate the bridge deflection according to the adjusted initial values ​​of all monitoring points and obtain the arch rib deformation of the long-span arch bridge.

[0038] In a third aspect, an embodiment of the present application further provides a system for measuring the deformation of an arch rib of a large-span arch bridge, the system comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the above-mentioned methods when executing the computer program.

[0039] It can be seen from the above embodiments that the method, device and system for measuring the deformation of the arch rib of a long-span arch bridge provided in the embodiments of the present application have at least the following beneficial effects:

[0040] The present application measures the deformation of the arch rib of a large-span arch bridge based on the inclination data of each monitoring point at different sampling moments in a local time period. Firstly, based on the characteristic that the deformation of the arch rib of a large-span arch bridge will cause the inclination data collected at different moments of the same monitoring point to change, the inclination data of the same monitoring point at different sampling moments in a local time period are compared with the standard inclination data to obtain the inclination deformation degree. Furthermore, combined with the characteristic that within the local time range of the current sampling moment, the closer the inclination data collected at the moment is to the current sampling moment, the more truly it can reflect the severity of the deformation of the arch rib of the large-span arch bridge at the current sampling moment. The severity of the deformation of the arch rib of the large-span arch bridge at the current sampling moment is evaluated to obtain the adjusted inclination deformation degree at the same monitoring point at the current sampling moment. Then, based on the characteristic that there is a time lag between different monitoring points in the load changes on the large-span arch bridge, the deformation degree of the adjusted inclination deformation degree is obtained. The hysteresis similarity of the first monitoring point at the current sampling moment is taken to evaluate the possibility of different monitoring points being affected by load changes. When the possibility of the first monitoring point and the second monitoring point being affected by load changes is greater, the possibility of obvious arch rib deformation problems in the long-span arch bridge is smaller. Then, according to the relationship between the adjusted inclination deformation at the first monitoring point at the current sampling moment, the inclination deformation and the hysteresis similarity, the initial value of the preset parameter K is adjusted to obtain the adjusted initial value at the first monitoring point at the current sampling moment. The adjusted initial value can adjust the sensitivity of the anomaly detection process to abnormal data, that is, the accuracy of the extracted inclination data at the time when the arch rib deformation may occur can be adjusted; finally, the bridge deflection is calculated according to the adjusted initial values ​​of all monitoring points to obtain the arch rib deformation of the large-span arch bridge, so as to solve the problem of inaccurate extracted inclination data and insufficient accuracy of arch rib deformation monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A flowchart of a method for measuring the deformation of an arch rib of a long-span arch bridge provided in one embodiment of the present application;

[0043] Figure 2 A flowchart for obtaining the degree of deformation of the tilt adjustment provided by one embodiment of the present application;

[0044] Figure 3 A flowchart of obtaining a hysteresis similarity provided by an embodiment of the present application;

[0045] Figure 4 A schematic structural diagram of an arch rib deformation measuring device for a long-span arch bridge provided in one embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following is a detailed description of the arch rib deformation measurement method, measurement device and system of a large-span arch bridge proposed in the present application, its specific implementation method, structure, features and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0047] Unless otherwise specified and limited, terms such as "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items. All technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application.

[0048] The following is a detailed description of a method, device and system for measuring the deformation of an arch rib of a large-span arch bridge provided by the present application in conjunction with the accompanying drawings.

[0049] See also Figure 1 , which shows a flowchart of a method for measuring the deformation of an arch rib of a long-span arch bridge provided by an embodiment of the present application, the method comprising the following steps:

[0050] S001: Collect inclination data of different monitoring points on the long-span arch bridge at the current sampling time and at different historical sampling times in the previous local time period, determine the standard inclination data of the monitoring point based on all the inclination data collected at the same monitoring point, and record the inclination data at the current sampling time and the second preset threshold sampling time before the inclination data collected at the same monitoring point as the local inclination data at the current sampling time.

[0051] A first preset threshold number of monitoring points are set at equal distances on a long-span arch bridge, a base and an inclination sensor are set at each monitoring point, the base is connected and fixed to the steel arch rib with bolts, and the base is connected and fixed to the inclination sensor with bolts. The inclination sensor is used to collect inclination data of different monitoring points at the same sampling time. The inclination data is the inclination angle of the inclination sensor position relative to the horizontal plane.

[0052] The earliest inclination data collected at the same monitoring point is recorded as the standard inclination data of the monitoring point. The inclination data collected at the same monitoring point at the current sampling time and the second preset threshold sampling time are recorded as the local inclination data at the current sampling time.

[0053] Among them, in this embodiment, the value of the first preset threshold is 11, the value of the second preset threshold is 7, and the sampling frequency of the inclination data is 10HZ. In actual application, as other implementation methods, the implementer can decide the values ​​of the first preset threshold and the second preset threshold, as well as the sampling frequency of the inclination data according to actual conditions. This application does not impose any special restrictions.

[0054] It can be understood that the sampling time includes the current sampling time and the historical sampling time. In this embodiment, the inclination data of 10 historical sampling times are collected.

[0055] At this point, the standard inclination data of the monitoring point and a preset number of local inclination data at the current sampling moment are obtained.

[0056] S002: According to the difference between each local inclination data at the current sampling moment determined by the same monitoring point and the standard inclination data, the inclination deformation degree at the same monitoring point at the current sampling moment is obtained; combined with the difference between the inclination deformation degrees of the local inclination data at the current sampling moment determined by the same monitoring point, and the time interval between the sampling moments corresponding to the local inclination data at the current sampling moment, the adjusted inclination deformation degree at the same monitoring point at the current sampling moment is obtained.

[0057] The inclination data at the moment when the arch rib deformation may occur is extracted from the inclination data, and then the inclination method is used to monitor the arch rib deformation according to the precise inclination data to obtain the deformation angle of the arch rib and the deformation of the arch rib deflection, thereby improving the accuracy of arch rib deformation monitoring using the inclination method.

[0058] In this embodiment, the initial value of the parameter K of the LOF anomaly detection algorithm is The second preset threshold is set to 7.

[0059] The inclination deformation degree at the same monitoring point at the current sampling moment is obtained according to the difference between each local inclination data at the current sampling moment determined by the same monitoring point and the standard inclination data.

[0060] Preferably, as an embodiment of the present application, the absolute value of the difference between the local inclination data and the standard inclination data at the current sampling moment determined by the same monitoring point is recorded as the absolute difference of the local inclination data, and the linear normalized value of the cumulative sum of the absolute differences of all local inclination data at the current sampling moment determined by the same monitoring point is recorded as the inclination deformation degree at the same monitoring point at the current sampling moment.

[0061] Among them, the calculation formula for the inclination deformation at the same monitoring point at the current sampling time is:

[0062]

[0063] In the formula, Indicates that the current sampling time is at the monitoring point The tilt deformation degree; Indicates monitoring point Determine the current sampling time Local inclination data; Indicates monitoring point Standard inclination data of Indicates monitoring point The number of local inclination data at the current sampling moment is determined, that is, the second preset threshold. In this embodiment, the value of the second preset threshold is 7; represents the linear normalization function.

[0064] The inclination deformation degree at the monitoring point at the current sampling time is used to reflect the change of the inclination data collected by the monitoring point within the local time range of the current sampling time. The change of the inclination data can reflect the severity of the deformation of the arch rib of the long-span arch bridge. When the difference between the local inclination data at the current sampling time determined by the monitoring point and the standard inclination data is greater, the change of the inclination data collected within the local time range of the current sampling time at the monitoring point is more obvious, and the deformation of the arch rib of the long-span arch bridge is more serious.

[0065] Furthermore, within the local time range of the current sampling moment, the inclination data collected closer to the current sampling moment can more truly reflect the severity of the deformation of the arch rib of the long-span arch bridge at the current sampling moment.

[0066] According to the difference between the inclination deformation degrees of the local inclination data at the current sampling moment determined by the same monitoring point and the time interval between the sampling moments corresponding to the local inclination data at the current sampling moment, the inclination deformation distribution characteristic value at the same monitoring point at the current sampling moment is obtained.

[0067] Preferably, as an embodiment of the present application, for the same monitoring point, the local inclination data at the current sampling moment is recorded as the target local inclination data, the absolute value of the difference between the inclination deformation at the sampling moment corresponding to the target local inclination data and the inclination deformation at the previous sampling moment is recorded as the first absolute value of the target local inclination data, the time interval between the sampling moment corresponding to the target local inclination data and the current sampling moment is recorded as the time difference of the target local inclination data, and the ratio of the first absolute value of the target local inclination data to the time difference is recorded as the first ratio of the target local inclination data; The power with a natural constant as the base and the opposite of the first ratio of the target local inclination data as the exponent is recorded as the first power value of the target local inclination data; the cumulative sum of the first power values ​​of all local inclination data determined at the same monitoring point at the current sampling time is recorded as the first cumulative sum at the same monitoring point at the current sampling time; the product of the mean of the inclination deformation degrees of all local inclination data determined at the same monitoring point at the current sampling time and the first cumulative sum at the same monitoring point at the current sampling time is recorded as the inclination deformation distribution characteristic value at the same monitoring point at the current sampling time.

[0068] Specifically, the calculation formula for the tilt deformation distribution characteristic value at the same monitoring point at the current sampling time is:

[0069]

[0070] In the formula, Indicates that the current sampling time is at the monitoring point The characteristic value of the tilt deformation distribution; Indicates monitoring point Determine the mean value of the inclination deformation of all local inclination data at the current sampling moment; Indicates that the current sampling time is at the monitoring point The tilt deformation degree; Indicates the number of samples before the current sampling time. Sampling time at the monitoring point The tilt deformation degree; Indicates the number of samples before the current sampling time. The time interval between the previous sampling moment and the current sampling moment; Indicates monitoring point Determine the number of local inclination data at the current sampling moment; It represents an exponential function with a natural constant as the base, and its function is to raise the natural constant to the power with the value in the brackets as the exponent.

[0071] The more serious the deformation of the arch rib of the large-span arch bridge at the current sampling moment, the greater the inclination deformation and the greater the difference of all local inclination data at the current sampling moment determined by the monitoring point. Therefore, the greater the mean of the inclination deformation of all local inclination data at the current sampling moment determined by the monitoring point and the greater the first power value of the local inclination data at the current sampling moment, the greater the characteristic value of the inclination deformation distribution at the same monitoring point at the current sampling moment.

[0072] According to the inclination deformation degree and the inclination deformation distribution characteristic value at the same monitoring point at the current sampling moment, the adjusted inclination deformation degree at the monitoring point at the current sampling moment is obtained.

[0073] Preferably, as an embodiment of the present application, the normalized value of the product of the inclination deformation degree and the inclination deformation distribution characteristic value at the same monitoring point at the current sampling moment is recorded as the adjusted inclination deformation degree at the monitoring point at the current sampling moment.

[0074] Specifically, the calculation formula for adjusting the tilt deformation at the monitoring point at the current sampling time is:

[0075]

[0076] In the formula, Indicates that the current sampling time is at the monitoring point Adjust the tilt angle deformation; Indicates that the current sampling time is at the monitoring point The tilt deformation degree; Indicates that the current sampling time is at the monitoring point The characteristic value of the tilt deformation distribution; represents the linear normalization function.

[0077] When the inclination deformation and the inclination deformation distribution characteristic value at the same monitoring point at the current sampling time are larger, the adjusted inclination deformation at the same monitoring point at the current sampling time is larger, and the arch rib deformation of the large-span arch bridge at the current sampling time is more serious.

[0078] At this point, the adjustment inclination deformation at the same monitoring point at the current sampling time is obtained. It can be understood that for each monitoring point on the long-span arch bridge, there is a corresponding adjustment inclination deformation at the current sampling time. The flow chart for obtaining the adjustment inclination deformation is as follows: Figure 2 shown.

[0079] S003: any monitoring point on the long-span arch bridge is recorded as the first monitoring point, and the monitoring point closest to the first monitoring point is recorded as the second monitoring point. According to the difference between the adjusted inclination deformation at the same sampling time in the local time period of the current sampling time, the difference between the characteristic values ​​of the inclination deformation distribution, and the similarity between all local inclination data at the current sampling time determined by the first monitoring point and the second monitoring point, the lagged similarity of the first monitoring point at the current sampling time is obtained. According to the relationship between the adjusted inclination deformation at the first monitoring point at the current sampling time, the inclination deformation and the lagged similarity, the initial value of the parameter K is adjusted using the adjusted inclination deformation at the first monitoring point at the current sampling time, and the adjusted initial value of the first monitoring point at the current sampling time is obtained.

[0080] During the operation of a long-span arch bridge, different vehicles will pass through the long-span arch bridge at different times. Therefore, the load on the long-span arch bridge changes dynamically, and the inclination data collected at different times will also fluctuate. Therefore, when the load on the long-span arch bridge changes greatly, the deformation of the adjusted inclination angle at the monitoring point at the current sampling moment is larger, and the deformation characteristics of the arch ribs of the long-span arch bridge at the current sampling moment are more obvious, and it is easy to misjudge the sampling moment affected by the load change as a significant arch rib deformation problem of the long-span arch bridge. Therefore, it is necessary to adjust the initial value of the parameter K of the LOF anomaly detection algorithm according to the load change on the long-span arch bridge to adjust the sensitivity of anomaly detection.

[0081] When a vehicle passes over a long-span arch bridge, the load on the long-span arch bridge changes with the change of the vehicle position. Therefore, there is a time interval between the corresponding moments when the inclination data collected at different monitoring points are affected by the same load, that is, there is a time delay between the moments when the inclination data collected at different monitoring points are affected by the same load. Therefore, when the adjustment inclination deformation of different monitoring points has the same change trend at different moments, the larger adjustment inclination deformation of these monitoring points is more likely to be affected by the load change, and the possibility of obvious arch rib deformation of the long-span arch bridge is smaller.

[0082] All local inclination data of the current sampling time determined by the same monitoring point are arranged in the time sequence of the sampling time to obtain the local inclination data sequence of the monitoring point at the current sampling time.

[0083] Any monitoring point on the long-span arch bridge is recorded as the first monitoring point, and the monitoring point closest to the first monitoring point is recorded as the second monitoring point.

[0084] It can be understood that when there are multiple monitoring points that are closest to the first monitoring point, the monitoring point corresponding to the maximum value of the inclination data at the current sampling moment among these monitoring points is recorded as the second monitoring point.

[0085] The Pearson correlation coefficient between the local inclination data sequences of the first monitoring point and the second monitoring point at the current sampling time is recorded as the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling time.

[0086] Among them, this embodiment selects the Pearson correlation coefficient to obtain the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling moment, that is, the Pearson correlation coefficient is selected as the similarity measure between local inclination data sequences. The implementer can use other methods of the prior art such as cosine similarity to measure the similarity between local inclination data sequences, and this application does not impose any special restrictions.

[0087] According to the difference between the adjusted inclination deformation degrees of the first monitoring point and the second monitoring point at the same sampling moment in the local time period of the current sampling moment, the difference between the characteristic values ​​of the inclination deformation distribution, and the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling moment, the lagged similarity of the first monitoring point and the second monitoring point at the current sampling moment is obtained.

[0088] Preferably, as an embodiment of the present application, the absolute value of the difference in the adjusted inclination deformation degree at the first monitoring point and the second monitoring point at the same sampling moment before the current sampling moment is recorded as the second absolute value of the same sampling moment before the current sampling moment, the power with a natural constant as the base and the opposite of the second absolute value of the same sampling moment before the current sampling moment as the exponent is recorded as the second power value of the target local inclination data at the same sampling moment before the current sampling moment, the cumulative sum of the second power values ​​of the target local inclination data at the current sampling moment and the second preset threshold sampling moments before and after is recorded as the second cumulative sum of the first monitoring point and the second monitoring point at the current sampling moment; the absolute value of the difference in the inclination deformation distribution characteristic values ​​at the first monitoring point and the second monitoring point at the current sampling moment is recorded as the third absolute value of the first monitoring point and the second monitoring point at the current sampling moment. The product of the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling moment and the second accumulated sum is recorded as the first product of the first monitoring point and the second monitoring point at the current sampling moment, and the linear normalized value of the ratio of the first product of the first monitoring point and the second monitoring point at the current sampling moment to the third absolute value is recorded as the lagged similarity of the first monitoring point and the second monitoring point at the current sampling moment.

[0089] In the process of calculating the ratio, in order to avoid the situation where the denominator is zero, a preset value needs to be added to the denominator, and an embodiment of the preset value is 0.001.

[0090] Specifically, the calculation formula for the lag similarity between the first monitoring point and the second monitoring point at the current sampling time is:

[0091]

[0092] In the formula, Indicates the first monitoring point and the second monitoring point lagged similarity at the current sampling moment; Indicates the first monitoring point and the second monitoring point The local inclination similarity at the current sampling moment; It represents an exponential function with a natural constant as the base, and its function is to raise the natural constant as the base and the value in the brackets as the exponent to the power; Indicates the number of samples before the current sampling time. The sampling time is at the first monitoring point Adjust the tilt angle deformation; Indicates the number of samples before the current sampling time. The sampling time is at the second monitoring point Adjust the tilt angle deformation; Indicates the first monitoring point Determine the number of local inclination data at the current sampling moment; Indicates that the current sampling time is at the first monitoring point The characteristic value of the tilt deformation distribution; Indicates that the current sampling time is at the second monitoring point The characteristic value of the tilt deformation distribution; represents a third preset threshold value. In this embodiment, the value of the third preset threshold value is 0.001, which is used to prevent the denominator from being 0; represents the linear normalization function.

[0093] The hysteresis similarity of the first monitoring point and the second monitoring point at the current sampling time is used to evaluate the possibility that the first monitoring point and the second monitoring point are affected by the load change. When the possibility that the first monitoring point and the second monitoring point are affected by the load change is greater, the possibility that the long-span arch bridge has obvious arch rib deformation problems is smaller. When the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling time is greater, the difference in the adjustment inclination deformation of the first monitoring point and the second monitoring point at the same sampling time before the current sampling time is smaller, and the difference in the inclination deformation distribution characteristic value of the first monitoring point and the second monitoring point at the current sampling time is smaller, the change trend of the adjustment inclination deformation of the first monitoring point and the second monitoring point at different times is more consistent, the possibility that the adjustment inclination deformation of the first monitoring point and the second monitoring point is larger because it is affected by the load change is greater, and the possibility that the long-span arch bridge has obvious arch rib deformation problems is smaller.

[0094] The same method can be used to obtain the lag similarity between any monitoring point on the long-span arch bridge and its nearest monitoring point at the current sampling time. Since the second monitoring point is determined after the first monitoring point is determined, any monitoring point on the long-span arch bridge has a corresponding lag similarity at the current sampling time. and the second monitoring point The lagged similarity at the current sampling time , recorded as the first monitoring point The lagged similarity at the current sampling time .

[0095] The flowchart of obtaining the delayed similarity is as follows: Figure 3 shown.

[0096] According to the relationship between the adjusted inclination deformation degree, the inclination deformation degree and the hysteresis similarity at the first monitoring point at the current sampling moment, the initial value of the parameter K is adjusted using the adjusted inclination deformation degree at the first monitoring point at the current sampling moment to obtain the adjusted initial value at the first monitoring point at the current sampling moment.

[0097]

[0098] In the formula, Indicates that the current sampling time is at the first monitoring point The initial value of adjustment; represents the initial value of the parameter K. In this embodiment, the initial value of the parameter K is 7; Indicates that the current sampling time is at the first monitoring point Adjust the tilt angle deformation; Indicates that the current sampling time is at the first monitoring point The tilt deformation degree; Indicates the first monitoring point lagged similarity at the current sampling moment; Represents the rounding up function, which is used to round up the value in the brackets.

[0099] At this point, the same method can be used to obtain the adjusted initial values ​​of all monitoring points on the long-span arch bridge at the current sampling time.

[0100] S004: Calculate the bridge deflection based on the adjusted initial values ​​of all monitoring points to obtain the deformation of the arch rib of the long-span arch bridge.

[0101] For each monitoring point at the current sampling moment, the adjusted initial value at the monitoring point at the current sampling moment is used as the value of the parameter K of the inclination data collected by the monitoring point at the current sampling moment. The LOF anomaly detection algorithm is used to perform anomaly detection on all the inclination data collected at the current sampling moment to obtain the anomaly detection result.

[0102] When the anomaly detection result contains abnormal data, the long-span arch bridge has arch rib deformation. Using the inclination method, according to the relationship between the rotation angle of the bridge section and the deflection curve, the bridge deflection is calculated according to the abnormal data. The deflection is the deformation of the arch rib of the long-span arch bridge.

[0103] Among them, using the inclination method to calculate the deformation of the arch rib of a long-span arch bridge based on the inclination data is a well-known technology and will not be described in detail.

[0104] When the LOF anomaly detection algorithm is used to perform anomaly detection on all the inclination data collected at the current sampling time, no abnormal data can be obtained, that is, when the anomaly detection result does not contain abnormal data, there is no arch rib deformation in the long-span arch bridge, and the arch rib deformation of the long-span arch bridge is 0.

[0105] At this point, the arch rib deformation of the long-span arch bridge is obtained.

[0106] See also Figure 4 , Figure 4 1 is a schematic diagram of the structure of a device for measuring the deformation of the arch ribs of a large-span arch bridge provided in one embodiment of the present application. The various units included in the device in this embodiment are used to execute the various steps in the embodiment corresponding to the method for measuring the deformation of the arch ribs of a large-span arch bridge. Figure 4 The arch rib deformation measuring device includes: an inclination data acquisition module, an inclination data difference analysis module, a parameter adjustment module, and an arch rib deformation measurement module.

[0107] The inclination data collection module collects the inclination data of different monitoring points on the long-span arch bridge at the current sampling time and at different historical sampling times in the previous local time period, determines the standard inclination data of the monitoring point based on all the inclination data collected at the same monitoring point, and records the inclination data at the current sampling time and the second preset threshold sampling time before in the inclination data collected at the same monitoring point as the local inclination data at the current sampling time;

[0108] The inclination data difference analysis module is used to obtain the inclination deformation degree at the same monitoring point at the current sampling moment according to the difference between each local inclination data at the current sampling moment determined by the same monitoring point and the standard inclination data, and to obtain the adjusted inclination deformation degree at the same monitoring point at the current sampling moment in combination with the difference between the inclination deformation degrees of the local inclination data at the current sampling moment determined by the same monitoring point and the time interval between the sampling moments corresponding to the local inclination data at the current sampling moment;

[0109] A parameter adjustment module is used to record any monitoring point on the long-span arch bridge as the first monitoring point, record the monitoring point closest to the first monitoring point as the second monitoring point, obtain the lag similarity of the first monitoring point at the current sampling moment according to the difference between the adjusted inclination deformation at the same sampling moment in the local time period of the current sampling moment and the difference between the characteristic values ​​of the inclination deformation distribution, and the similarity between all local inclination data at the current sampling moment determined by the first monitoring point and the second monitoring point, adjust the initial value of the preset parameter K at the current sampling moment according to the relationship between the adjusted inclination deformation at the first monitoring point, the inclination deformation and the lag similarity, and obtain the adjusted initial value at the first monitoring point at the current sampling moment;

[0110] The arch rib deformation measurement module is used to calculate the bridge deflection according to the adjusted initial values ​​of all monitoring points and obtain the arch rib deformation of the long-span arch bridge.

[0111] Based on the same inventive concept as the above method, an embodiment of the present application also provides a system for measuring the deformation of an arch rib of a large-span arch bridge, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the above-mentioned methods for measuring the deformation of an arch rib of a large-span arch bridge when executing the computer program.

[0112] It is to be understood that the sequence of the embodiments of the present application described above is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of the present specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0113] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0114] The above content is only an implementation method of the present application and is not intended to limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the protection scope of the present application.

Claims

1. A method for measuring the deformation of an arch rib of a long-span arch bridge, characterized in that: The method comprises the following steps: Collect the inclination data of different monitoring points on the long-span arch bridge at the current sampling time and at different historical sampling times in the previous local time period, determine the standard inclination data of the monitoring point according to all the inclination data collected at the same monitoring point, and record the inclination data at the current sampling time and the second preset threshold sampling time before in the inclination data collected at the same monitoring point as the local inclination data at the current sampling time; According to the difference between each local inclination data and the standard inclination data at the current sampling moment determined by the same monitoring point, the inclination deformation degree at the same monitoring point at the current sampling moment is obtained, and the adjustment inclination deformation degree at the same monitoring point at the current sampling moment is obtained by combining the difference between the inclination deformation degrees of the local inclination data at the current sampling moment determined by the same monitoring point and the time interval between the sampling moments corresponding to the local inclination data at the current sampling moment; Any monitoring point on the long-span arch bridge is recorded as the first monitoring point, and the monitoring point closest to the first monitoring point is recorded as the second monitoring point. According to the difference between the adjusted inclination deformation at the same sampling time in the local time period of the current sampling time, the difference between the characteristic values ​​of the inclination deformation distribution, and the similarity between all local inclination data at the current sampling time determined by the first monitoring point and the second monitoring point, the lagged similarity of the first monitoring point at the current sampling time is obtained. According to the relationship between the adjusted inclination deformation, the inclination deformation and the lagged similarity at the first monitoring point at the current sampling time, the initial value of the parameter K of the preset LOF anomaly detection algorithm is adjusted to obtain the adjusted initial value of the first monitoring point at the current sampling time; The bridge deflection is calculated based on the adjusted initial values ​​of all monitoring points to obtain the deformation of the arch rib of the long-span arch bridge; The method for obtaining the characteristic value of the inclination deformation distribution is: For the same monitoring point, the local inclination data at the current sampling moment is recorded as the target local inclination data, the absolute value of the difference between the inclination deformation at the sampling moment corresponding to the target local inclination data and the inclination deformation at the previous sampling moment is recorded as the first absolute value of the target local inclination data, the time interval between the sampling moment corresponding to the target local inclination data and the current sampling moment is recorded as the time difference of the target local inclination data, and the ratio of the first absolute value of the target local inclination data to the time difference is recorded as the first ratio of the target local inclination data; a power with a natural constant as the base and the opposite number of the first ratio of the target local inclination data as the exponent is recorded as the first power value of the target local inclination data, and the cumulative sum of the first power values ​​of all local inclination data at the current sampling moment determined by the same monitoring point is recorded as the first cumulative sum at the same monitoring point at the current sampling moment; The product of the mean value of the inclination deformation of all local inclination data determined at the same monitoring point at the current sampling moment and the first cumulative sum at the same monitoring point at the current sampling moment is recorded as the inclination deformation distribution characteristic value at the same monitoring point at the current sampling moment.

2. The method for measuring deformation of the arch rib of a long-span arch bridge according to claim 1, characterized in that: The specific process of determining the standard inclination data of the monitoring point is as follows: The inclination data with the earliest sampling time among the inclination data collected at the same monitoring point is recorded as the standard inclination data of the monitoring point.

3. The method for measuring deformation of the arch rib of a long-span arch bridge according to claim 1, characterized in that: The construction process of the inclination deformation degree at the same monitoring point at the current sampling time is: The absolute value of the difference between the local inclination data and the standard inclination data at the current sampling moment determined by the same monitoring point is recorded as the absolute difference of the local inclination data, and the linear normalized value of the cumulative sum of the absolute differences of all local inclination data determined by the same monitoring point at the current sampling moment is recorded as the inclination deformation degree at the same monitoring point at the current sampling moment.

4. The method for measuring deformation of the arch rib of a long-span arch bridge according to claim 1, characterized in that: The construction process of adjusting the tilt deformation degree at the same monitoring point at the current sampling time is: The normalized value of the product of the inclination deformation degree and the inclination deformation distribution characteristic value at the same monitoring point at the current sampling time is recorded as the adjusted inclination deformation degree at the monitoring point at the current sampling time.

5. The method for measuring deformation of the arch rib of a long-span arch bridge according to claim 1, characterized in that: The process of determining the lag similarity of the first monitoring point at the current sampling time is: Arrange all local inclination data of the current sampling time determined by the same monitoring point in the time sequence of the sampling time to obtain the local inclination data sequence of the same monitoring point at the current sampling time; record the Pearson correlation coefficient between the local inclination data sequences of the first monitoring point and the second monitoring point at the current sampling time as the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling time; The absolute value of the difference between the adjusted tilt deformation degrees at the first monitoring point and the second monitoring point at the same sampling moment before the current sampling moment is recorded as the second absolute value at the same sampling moment before the current sampling moment, a power with a natural constant as the base and the opposite number of the second absolute value at the same sampling moment before the current sampling moment as the exponent is recorded as the second power value of the target local tilt data at the same sampling moment before the current sampling moment, and the cumulative sum of the second power values ​​of the target local tilt data at the current sampling moment and a total of a second preset threshold number of sampling moments before and after is recorded as the second cumulative sum of the first monitoring point and the second monitoring point at the current sampling moment; The absolute value of the difference between the tilt deformation distribution characteristic values ​​at the first monitoring point and the second monitoring point at the current sampling time is recorded as the third absolute value of the first monitoring point and the second monitoring point at the current sampling time; The lag similarity of the first monitoring point at the current sampling moment is obtained according to the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling moment, the second cumulative sum and the third absolute value.

6. The method for measuring deformation of the arch rib of a long-span arch bridge according to claim 5, characterized in that: The specific process of obtaining the lag similarity of the first monitoring point at the current sampling time is as follows: The product of the local inclination similarity of the first monitoring point and the second monitoring point at the current sampling time and the second accumulated sum is recorded as the first product of the first monitoring point and the second monitoring point at the current sampling time; A linear normalized value of the ratio of the first product of the first monitoring point and the second monitoring point at the current sampling time to the third absolute value is recorded as the lag similarity of the first monitoring point at the current sampling time.

7. The method for measuring deformation of the arch rib of a long-span arch bridge according to claim 1, characterized in that: The specific process of obtaining the adjusted initial value at the first monitoring point at the current sampling time is as follows: Where u′ i1 represents the initial value of the adjustment at the first monitoring point i1 at the current sampling time; u represents the initial value of the parameter K; B′ i1 Indicates the adjustment angle deformation degree at the first monitoring point i1 at the current sampling time; B i1 Indicates the inclination deformation degree at the first monitoring point i1 at the current sampling time; D i1 represents the lag similarity of the first monitoring point i1 at the current sampling time; F[] represents the rounding up function.

8. The method for measuring deformation of the arch rib of a long-span arch bridge according to claim 1, characterized in that: The bridge deflection is calculated based on the adjusted initial values ​​of all monitoring points to obtain the deformation of the arch rib of the long-span arch bridge. The specific process of obtaining is: The adjusted initial value at the monitoring point at the current sampling time is used as the value of the parameter K of the inclination data collected by the monitoring point at the current sampling time, and the LOF anomaly detection algorithm is used to perform anomaly detection on all the inclination data collected at all monitoring points at the current sampling time to obtain anomaly detection results; When the anomaly detection results contain abnormal data, the deformation of the arch rib of the long-span arch bridge is calculated based on the abnormal data according to the relationship between the rotation angle and the deflection curve of the bridge section; When the anomaly detection result does not contain abnormal data, the arch rib deformation of the long-span arch bridge is 0.

9. A device for measuring deformation of an arch rib of a long-span arch bridge, implementing the method as claimed in claim 1, characterized in that: The arch rib deformation measuring device comprises: The inclination data collection module collects the inclination data of different monitoring points on the long-span arch bridge at the current sampling time and at different historical sampling times in the previous local time period, determines the standard inclination data of the monitoring point based on all the inclination data collected at the same monitoring point, and records the inclination data at the current sampling time and the second preset threshold sampling time before in the inclination data collected at the same monitoring point as the local inclination data at the current sampling time; The inclination data difference analysis module is used to obtain the inclination deformation degree at the same monitoring point at the current sampling moment according to the difference between each local inclination data at the current sampling moment determined by the same monitoring point and the standard inclination data, and to obtain the adjusted inclination deformation degree at the same monitoring point at the current sampling moment in combination with the difference between the inclination deformation degrees of the local inclination data at the current sampling moment determined by the same monitoring point and the time interval between the sampling moments corresponding to the local inclination data at the current sampling moment; A parameter adjustment module is used to record any monitoring point on the long-span arch bridge as the first monitoring point, record the monitoring point closest to the first monitoring point as the second monitoring point, obtain the lag similarity of the first monitoring point at the current sampling moment according to the difference between the adjusted inclination deformation at the same sampling moment in the local time period of the current sampling moment and the difference between the characteristic values ​​of the inclination deformation distribution, and the similarity between all local inclination data at the current sampling moment determined by the first monitoring point and the second monitoring point, adjust the initial value of the preset parameter K at the current sampling moment according to the relationship between the adjusted inclination deformation at the first monitoring point, the inclination deformation and the lag similarity, and obtain the adjusted initial value at the first monitoring point at the current sampling moment; The arch rib deformation measurement module is used to calculate the bridge deflection according to the adjusted initial values ​​of all monitoring points and obtain the arch rib deformation of the long-span arch bridge.

10. A system for measuring deformation of an arch rib of a long-span arch bridge, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

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