Method for monitoring cable replacement offset of stay cable using BIM technology

Abstract

This application relates to the field of BIM technology for offset monitoring, specifically a method for monitoring the offset of replaced cable-stayed bridge strands using BIM technology. The method includes: designating the replaced cable-stayed bridge strand as the target cable-stayed bridge strand and acquiring displacement data of each monitoring point on the target cable-stayed bridge strand and its adjacent cable-stayed bridge strands; acquiring the vibration disturbance degree of the target cable-stayed bridge strand and analyzing the accuracy of the displacement data at each monitoring point; obtaining the reliability of the displacement data at each monitoring point based on the vibration disturbance degree and the accuracy of the displacement data; and filtering the displacement data at each monitoring point based on the reliability of the displacement data to monitor the offset of the target cable-stayed bridge strand in conjunction with the BIM model of the cable-stayed bridge. This application can improve the accuracy of monitoring the offset of replaced cable-stayed bridge strands.

Description

Technical Field

[0001] This application relates to the field of BIM technology offset monitoring technology, specifically to a method for monitoring the offset of cable-stayed steel strand replacement using BIM technology. Background Technology

[0002] As the main load-bearing component of long-span cable-stayed bridges, the steel strands of the stay cables may face different operating conditions during use, which may lead to various problems such as aging and corrosion. Usually, the steel strands of the stay cables are inspected and tested to assess their condition and load-bearing capacity to determine whether they need to be replaced. After replacement, the stay cables also need to undergo quality inspection.

[0003] In existing technologies, BIM technology is typically used to monitor the offset of stay cable strands. This involves collecting real-time data on the stay cable strands and then associating and mapping it with corresponding components in the BIM model. This analysis determines whether the collected offset is within acceptable limits, and consequently, whether the replaced stay cable strands meet relevant requirements. Typically, traffic disruption is required for replacement, and after completion, intelligent sensors are used for quality inspection. However, the use of intelligent sensors for quality inspection of stay cable strands is affected by passing vehicles, leading to data inaccuracies and a relatively low level of accuracy in the quality inspection. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology, thereby resolving the existing issues.

[0005] The method for monitoring the offset of cable-stayed steel strand replacement using BIM technology in this application adopts the following technical solution:

[0006] One embodiment of this application provides a method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology, including the following steps:

[0007] The replaced cable on the cable-stayed bridge is designated as the target cable, and displacement data of each monitoring point on the target cable and its adjacent cables are obtained.

[0008] Based on the differences in the peak displacement data distribution of the target cable and its neighboring cables at each monitoring point, as well as the displacement change trend of the monitoring points on the target cable, the vibration disturbance degree of the target cable is obtained.

[0009] The peak density of displacement data at each monitoring point of each cable is extracted by utilizing the time interval between peaks in the displacement data of each monitoring point of each cable. Based on the similarity of the displacement data distribution of the target cable and its neighboring cables, and combined with the difference in peak density of displacement data between the target cable and its neighboring cables, the accuracy of displacement data at each monitoring point of the target cable is obtained.

[0010] Based on the vibration disturbance degree and displacement data accuracy of the target cable, the reliability of displacement data at each monitoring point of the target cable is obtained. The displacement data at each monitoring point of the target cable is then filtered based on the reliability of the displacement data, so as to monitor the displacement of the target cable in conjunction with the BIM model of the cable-stayed bridge.

[0011] Preferably, the displacement data of each monitoring point are arranged in chronological order to form a displacement sequence of each monitoring point, the displacement data range of each monitoring point on a single cable is statistically analyzed, and the monitoring points are arranged in ascending order of height to form a gradual displacement fluctuation sequence of a single cable.

[0012] Preferably, the process for obtaining the vibration disturbance degree of the target cable is as follows: ;in, For the vibration disturbance degree of the target cable-stayed bridge, Let J represent the trend intensity of the gradual change sequence of displacement fluctuation of the target cable, and J be the number of neighboring cables of the target cable. To prevent constants with a denominator of 0, Let be the approximation of the displacement fluctuation of the target cable and its j-th neighboring cable.

[0013] Preferably, the process of obtaining the approximation of the displacement fluctuation is as follows: In the formula, Let P be the sampling time corresponding to the p-th displacement peak value in the displacement time series of the target cable and the i-th monitoring point of the j-th adjacent cable, respectively. Let I be the total number of monitoring points of the cable and P be the number of peak values ​​of displacement data of each monitoring point of the target cable.

[0014] Preferably, the mean value of the time interval between any two adjacent peaks in the displacement data of each monitoring point of each cable is used as the peak density of the displacement data of each monitoring point of each cable.

[0015] Preferably, the process for obtaining the accuracy of displacement data at each monitoring point of the target cable is as follows: ;in, In the formula, To ensure the accuracy of displacement data at the target cable anchor end monitoring points, the monitoring point closest to the target cable anchor end is selected as the target cable anchor end monitoring point. For the approximation of the combined peak of the target cable-stayed bridge, Let be the cosine similarity between the target cable and the u-th combined peak of the j-th neighboring cable. denoted as peak density of displacement data at the anchor end monitoring point of the target cable and the j-th adjacent cable, respectively; U is the minimum number of combined peaks of the target cable and the j-th adjacent cable; and J is the number of adjacent cables of the target cable.

[0016] Preferably, all valleys in the displacement data of the anchor end monitoring points of the cable are segmented by a threshold, and valleys less than or equal to the segmentation threshold are taken as segmentation points. The displacement data between the previous segmentation point and the next segmentation point of each peak are taken as the combined peaks of the cable.

[0017] Preferably, the process for obtaining the reliability of the displacement data at each monitoring point of the target cable is as follows: In the formula, To assess the reliability of the displacement data at the current monitoring point of the target cable, For the vibration disturbance degree of the target cable-stayed bridge, To ensure the accuracy of the displacement data at the current monitoring point of the target cable, This is the normalization function.

[0018] Preferably, the specific process of filtering the displacement data of each monitoring point of the target cable is as follows: the displacement data of the monitoring points that are greater than or equal to the preset displacement data confidence threshold are used as the final data for monitoring the offset of the target cable.

[0019] Preferably, the final data used for monitoring the offset of the target cable is input into the BIM model of the cable-stayed bridge to simulate the offset state of the target cable and thus monitor the offset of the target cable.

[0020] This application has at least the following beneficial effects:

[0021] This application analyzes the external factors affecting displacement data acquisition after cable replacement, and combines the displacement data fluctuation characteristics of the target cable and adjacent cables to determine whether external factors interfere with the currently acquired displacement data, thereby determining the accuracy of the data. Finally, using accurate cable displacement data as input, a BIM model is used to analyze the offset of the replaced cable. This application solves the problem that in the current traditional method of monitoring cable offset, the measurement data is easily affected by the environment and passing vehicles, leading to a decrease in accuracy and resulting in errors in the judgment of cable offset. Attached Figure Description

[0022] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart illustrating the steps of the method for monitoring the offset of cable-stayed steel strand replacement using BIM technology provided in this application. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by this application to achieve the intended purpose of the invention, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of the method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology proposed in this application. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0025] Unless otherwise defined, terms such as “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the article or device that includes said element. Furthermore, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] The following, in conjunction with the accompanying drawings, details the specific scheme of the method for monitoring the offset of cable-stayed strand replacement using BIM technology provided in this application.

[0027] This application provides an embodiment of a method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology. For details, please refer to [link to specific documentation]. Figure 1 This includes the following steps:

[0028] Step 1: Designate the replaced cable on the cable-stayed bridge as the target cable and obtain the displacement data of each monitoring point on the target cable and its adjacent cables.

[0029] First, in this embodiment, a BIM model of the cable-stayed bridge whose cable is to be replaced is obtained. The construction of the BIM model is a well-known prior art and will not be elaborated upon here. This embodiment takes the replacement of one cable in any cable-stayed bridge as an example. For ease of understanding, the replaced cable is referred to as the target cable. Starting from the anchor end of the cable, based on the position parameters obtained in the BIM model, multiple monitoring points are set on the target cable. The number of monitoring points is set by the implementer; in this embodiment, it is set to 10. Using an intelligent laser displacement sensor, each monitoring point on the target cable is simultaneously measured at every time interval t, acquiring displacement data for each monitoring point on a single cable, for a total of T data points. The displacement data collected from each monitoring point are arranged chronologically to form the displacement sequence of each monitoring point.

[0030] Furthermore, displacement data of each monitoring point on the cable adjacent to the target cable is extracted. Using the above method, the displacement data of each monitoring point on the cable closest to the target cable (described in this embodiment as the cable adjacent to the target cable) is collected by an intelligent laser displacement sensor to obtain the displacement sequence of each monitoring point on the cable adjacent to the target cable.

[0031] It should be noted that in this embodiment, t=2s and T is 300. In actual application scenarios, implementers can set it according to the actual situation. This embodiment does not impose any special restrictions on this.

[0032] Step 2: Based on the differences in the peak displacement data distribution of the target cable and its neighboring cables at each monitoring point, as well as the displacement change trend of the monitoring points on the target cable, the vibration disturbance degree of the target cable is obtained.

[0033] Under normal circumstances, cable stays are affected by external factors, such as thermal expansion and contraction caused by temperature changes, vibration caused by wind blowing the cable stays, and vibration generated by vehicles passing over the bridge. These factors will cause vibration and displacement, and the collected cable stay displacement data will usually show certain fluctuations. This will interfere with the monitoring of whether the cable stays are shifted. Therefore, it is necessary to first eliminate the influence of the external environment on the cable stay displacement data.

[0034] Specifically, regarding the cable displacement data caused by external factors, multiple adjacent cables exhibit certain similarities. For example, when a vehicle passes over the location of a few cables, vibrations occur. Because these cables are located close to each other, the vibration interference they experience is similar. Therefore, the degree and timing of data fluctuations in their location data are similar. Furthermore, since the vibrations generated by vehicles are mainly transmitted through the bridge deck, the impact of the vibrations decreases with increasing distance. Therefore, for a single cable affected by vibration, the impact of the vibrations changes from large to small from the anchor end to the top of the tower. Specifically, the fluctuation impact of a single cable displacement data at different monitoring points decreases with increasing height of the monitoring point.

[0035] Therefore, in this embodiment, for the displacement data collected from a single monitoring point of a single stay cable, all peak values ​​in the displacement sequence are first obtained, then the displacement data range of a single monitoring point is obtained and used as the fluctuation amplitude of that monitoring point. The fluctuation amplitudes of each monitoring point of the stay cable are obtained, and a displacement fluctuation gradient sequence is constructed by arranging the monitoring points from smallest to largest height. Based on the above analysis, the vibration interference degree of the target stay cable is constructed through the following relationship to characterize the degree of interference of the currently collected target stay cable data. Preferably, the specific calculation relationship in this embodiment is as follows:

[0036] ; ;

[0037] in, For the vibration disturbance degree of the target cable-stayed bridge, Let be the approximation of the displacement fluctuation of the target cable and its j-th neighboring cable. These are the sampling times corresponding to the p-th displacement peak value within the displacement time series of the target cable and the i-th monitoring point of the j-th adjacent cable, respectively. Let I represent the trend intensity of the gradual change sequence of displacement fluctuation of the target cable, P represent the total number of monitoring points on the cable, J represent the number of peak values ​​of displacement data at each monitoring point on the target cable, and J represent the number of neighboring cables of the target cable. To prevent constants with a denominator of 0 from being included, the value range is from 0 to 0.01. It should be noted that the trend strength of the sequence is obtained through the trend strength calculation formula in the STL decomposition algorithm. The specific calculation process is existing technology and will not be described in detail in this embodiment.

[0038] Based on the above process, it can be understood that the closer the time when the displacement data of the target cable and the adjacent cable fluctuate up to the current moment, and the stronger the regularity of the fluctuation of the target cable displacement data decreasing with the increase of height, the more likely the displacement data of the target cable is to be affected by external factors, the stronger the degree of vibration interference in the measured data, and the lower the accuracy.

[0039] Step 3: Extract the peak density of displacement data for each monitoring point of each cable by utilizing the time interval between peaks in the displacement data of each monitoring point of each cable. Based on the similarity of the displacement data distribution of the target cable and its neighboring cables, and combined with the difference in peak density of displacement data between the target cable and its neighboring cables, obtain the accuracy of displacement data for each monitoring point of the target cable.

[0040] For traffic conditions on a cable-stayed bridge, the impact of vibrations caused by different vehicle types, speeds, positions, and cable spacing varies. For example, large vehicles passing close to the cables generate significant vibrations with a noticeable impact. Conversely, smaller vehicles passing further away generate less vibration with a weaker impact, and the vibrations may even attenuate, causing less impact on all cables. Closer cables experience stronger interference, while farther cables experience weaker interference, with a time lag in the interference. For instance, if a small vehicle passes on the right side of a cable-stayed bridge, the outermost cable on the left side may experience less interference, while the innermost cable experiences greater interference, occurring earlier. Ultimately, due to the combined influence of different vehicle types, speeds, and positions, simply analyzing the displacement differences between the target cable and adjacent cables can easily lead to misjudgments, interfering with subsequent offset monitoring. Therefore, further analysis is needed.

[0041] Specifically, regarding the interference caused by vehicles on the stay cables under different conditions, the displacement data mainly manifests as single fluctuations and combined fluctuations. Single fluctuations refer to the data fluctuations caused by a single vehicle passing by, while combined fluctuations occur when multiple vehicles pass by simultaneously or for a short period, generating various different vibration effects in a short time. This is reflected in the data as a peak appearing after the displacement data fluctuates, followed by a new peak appearing during the peak's decline, ultimately forming a large combined peak composed of multiple peaks. For the target stay cable and adjacent stay cables, the degree of interference caused by different vibrations varies to some extent, while the frequency and type of interference are consistent. Specifically, when the target stay cable and adjacent stay cables are disturbed by combined fluctuations, the corresponding time of fluctuation and the degree of interference in the displacement data are different, but the frequency of interference and the peak shape generated when disturbed are highly similar.

[0042] Therefore, taking any monitoring point of a single cable as an example for analysis, this embodiment selects the monitoring point closest to the anchor end of the target cable as an example, because it is closest to the bridge deck and is more significantly affected by vibrations caused by passing vehicles. In this embodiment, it is referred to as the anchor end monitoring point of the cable. All peaks and troughs in the displacement data of the anchor end monitoring point are statistically analyzed, and all trough data are used as input to the Otsu threshold method to obtain the segmentation threshold of the trough data. When a trough data is less than or equal to the threshold, the trough point corresponding to the trough data is taken as the segmentation point, and the displacement data between the previous segmentation point and the next segmentation point of each peak is taken as the combined peaks of the cable. Furthermore, the mean of the time interval between any two adjacent peaks in the displacement data of the cable anchor end monitoring point is taken as the peak density of the displacement data of the cable anchor end monitoring point.

[0043] Based on the above analysis, in this embodiment, the accuracy of the displacement data of each monitoring point of the target cable is obtained according to the similarity of the displacement data distribution of the target cable and its neighboring cables, and the difference in the peak density of the displacement data of the target cable and its neighboring cables. The specific calculation relationship is as follows:

[0044] ; In the formula, To ensure the accuracy of displacement data at the target cable anchor end monitoring points, For the approximation of the combined peak of the target cable-stayed bridge, Let be the cosine similarity between the target cable and the u-th combined peak of the j-th neighboring cable. If the data volume of two combined peaks is different, the one with the smallest data volume is used as the benchmark for calculation and analysis. denoted as peak density of displacement data at the anchor end monitoring point of the target cable and the j-th adjacent cable, respectively; U is the minimum number of combined peaks of the target cable and the j-th adjacent cable; and J is the number of adjacent cables of the target cable.

[0045] It is understandable that when the displacement data measured at the anchor end monitoring point of the target cable is more similar in shape to the combined peak measured in the adjacent cable, and the overall peak density is more similar, it indicates that the current target cable and the adjacent cable are more consistent in terms of the influence, and the accuracy of the displacement data measured at this time of the target cable is smaller.

[0046] Step 4: Based on the vibration disturbance degree and displacement data accuracy of the target cable, obtain the reliability of the displacement data of each monitoring point of the target cable, and filter the displacement data of each monitoring point of the target cable based on the reliability of the displacement data, so as to monitor the displacement of the target cable in combination with the BIM model of the cable-stayed bridge.

[0047] Furthermore, using the vibration disturbance degree of the target cable and the accuracy of the displacement data at each monitoring point of the target cable, the reliability of the displacement data at each monitoring point of the target cable is calculated to characterize the reliability of the current displacement data at each monitoring point of the target cable. In this embodiment, the specific formula for calculating the reliability of the displacement data at the current monitoring point of the target cable is as follows: In the formula, To assess the reliability of the displacement data at the current monitoring point of the target cable, For the vibration disturbance degree of the target cable-stayed bridge, To ensure the accuracy of the displacement data at the current monitoring point of the target cable, This is the normalization function.

[0048] Based on the above process, it can be understood that the lower the degree of vibration interference to the displacement data collected from the current target cable, the greater the accuracy of the displacement data, and the higher the reliability of the collected data, the more it can be used to judge the offset of the replaced cable.

[0049] The reliability of displacement data at each monitoring point of the target cable is obtained and normalized using the above method. Based on the reliability of the displacement data, the displacement data at each monitoring point of the target cable is filtered. Many existing normalization methods exist; this embodiment uses the range normalization method. This embodiment does not impose any special restrictions on this method; in actual application scenarios, the implementer can choose the appropriate method. Furthermore, a preset displacement data reliability threshold is set to 0.7 in this embodiment. When the reliability of the displacement data at the monitoring point of the target cable is greater than or equal to the displacement data reliability threshold, it indicates that the reliability of the displacement data at the corresponding monitoring point of the target cable is high and can be used for subsequent monitoring of the cable offset. In this embodiment, the displacement data of monitoring points greater than or equal to the displacement data reliability threshold is used as the final data for monitoring the offset of the target cable; otherwise, the reliability of the displacement data of the corresponding monitoring point is low and it is not used as the final data for monitoring the offset of the target cable.

[0050] Furthermore, displacement data from each monitoring point of the target cable-stayed bridge, exceeding or equal to the displacement data reliability threshold, are input into the BIM model of the cable-stayed bridge. Offset analysis is then performed using the data from the BIM model. Specifically, the displacement data from each monitoring point selected for target cable offset monitoring is mapped onto the cable in the BIM model, enabling the model to reflect the actual state of the cable-stayed bridge in real time. This allows for simulation of the target cable offset state, determination of the cable's vibration modes, and evaluation of the actual vibration state and offset changes. Finally, considering the mechanical properties of the cable strands and construction specifications, the offset is assessed to determine if it is within the allowable range. If the offset exceeds the design or construction allowable value, a timely warning signal is issued. The specific simulation and offset evaluation process are existing technologies known to those skilled in the art and will not be elaborated upon in this embodiment.

[0051] It is understood that references to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of this application include the specific features, structures, or characteristics described in connection with that embodiment. Therefore, the appearance of phrases such as "in one embodiment," "in some embodiments," "in other embodiments," or "in still other embodiments" in different parts of this specification does not necessarily refer to the same embodiment, but rather means "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0052] It should be noted that the order of the embodiments described above is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some implementations, multitasking and parallel processing are possible or may be advantageous. Moreover, the sequence numbers of the steps in the embodiments do not imply a specific order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments in this specification.

[0053] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for monitoring the amount of displacement of a cable-stayed steel strand replacement using BIM technology, characterized by, Includes the following steps: The replaced cable on the cable-stayed bridge is designated as the target cable, and displacement data of each monitoring point on the target cable and its adjacent cables are obtained. Based on the differences in the peak displacement data distribution of the target cable and its neighboring cables at each monitoring point, as well as the displacement change trend of the monitoring points on the target cable, the vibration disturbance degree of the target cable is obtained. The peak density of displacement data at each monitoring point of each cable is extracted by utilizing the time interval between peaks in the displacement data of each monitoring point of each cable. Based on the similarity of the displacement data distribution of the target cable and its neighboring cables, and combined with the difference in peak density of displacement data between the target cable and its neighboring cables, the accuracy of displacement data at each monitoring point of the target cable is obtained. Based on the vibration disturbance degree and displacement data accuracy of the target cable, the reliability of displacement data at each monitoring point of the target cable is obtained. The displacement data at each monitoring point of the target cable is then filtered based on the reliability of the displacement data, so as to monitor the displacement of the target cable in conjunction with the BIM model of the cable-stayed bridge.

2. The method of claim 1, wherein the method is characterized by, The displacement data of each monitoring point are arranged in chronological order to form the displacement sequence of each monitoring point. The displacement range of each monitoring point on a single cable is calculated and arranged in ascending order of monitoring point height to form the displacement fluctuation gradient sequence of a single cable.

3. The method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology as described in claim 2, characterized in that, The acquisition process of the vibration interference degree of the target cable is: ; wherein, is the vibration interference degree of the target cable, is the trend intensity of the displacement fluctuation gradual change sequence of the target cable, J is the number of adjacent cables of the target cable, is a constant for preventing the denominator from being 0, is the displacement fluctuation approximation degree of the target cable and the jth adjacent cable thereof.

4. The method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology as described in claim 3, characterized in that, The process of obtaining the approximation of the displacement fluctuation is as follows: In the formula, Let P be the sampling time corresponding to the p-th displacement peak value in the displacement time series of the target cable and the i-th monitoring point of the j-th adjacent cable, respectively. Let I be the total number of monitoring points of the cable and P be the number of peak values ​​of displacement data of each monitoring point of the target cable.

5. The method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology as described in claim 1, characterized in that, The mean of the time intervals between any two adjacent peaks in the displacement data of each monitoring point of each cable is taken as the peak density of the displacement data of each monitoring point of each cable.

6. The method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology as described in claim 1, characterized in that, The process for obtaining the accuracy of displacement data at each monitoring point of the target cable is as follows: ;in, In the formula, To ensure the accuracy of displacement data at the target cable anchor end monitoring points, the monitoring point closest to the target cable anchor end is selected as the target cable anchor end monitoring point. For the approximation of the combined peak of the target cable-stayed bridge, Let be the cosine similarity between the target cable and the u-th combined peak of the j-th neighboring cable. Let U and J be the peak density of displacement data at the anchor end monitoring points of the target cable and the j-th adjacent cable, respectively; U is the minimum number of combined peaks of the target cable and the j-th adjacent cable; and J is the number of adjacent cables of the target cable. Among them, all valleys in the displacement data of the anchor end monitoring points of the cable are thresholded, and valleys less than or equal to the threshold are taken as the dividing points. The displacement data between the previous dividing point and the next dividing point of each peak are taken as the combined peaks of the cable.

7. The method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology as described in claim 1, characterized in that, The process for obtaining the reliability of the displacement data at each monitoring point of the target cable is as follows: In the formula, To assess the reliability of the displacement data at the current monitoring point of the target cable-stayed bridge, For the vibration disturbance degree of the target cable-stayed bridge, To ensure the accuracy of the displacement data at the current monitoring point of the target cable, This is the normalization function.

8. The method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology as described in claim 1, characterized in that, The specific process for filtering the displacement data of each monitoring point of the target cable is as follows: the displacement data of the monitoring points that are greater than or equal to the preset displacement data confidence threshold are used as the final data for monitoring the offset of the target cable.

9. The method for monitoring the offset of cable-stayed bridge strand replacement using BIM technology as described in claim 8, characterized in that, The final data used for monitoring the offset of the target cable is input into the BIM model of the cable-stayed bridge to simulate the offset state of the target cable and thus monitor the offset of the target cable.

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