CN-121762096-B - Real-time monitoring system for cable force of bridge inhaul cable

CN121762096BCN 121762096 BCN121762096 BCN 121762096BCN-121762096-B

Abstract

The invention relates to the technical field of bridge structure safety monitoring, in particular to a real-time monitoring system for bridge inhaul cable force. According to the method, initial cable force is determined according to the vibration frequency signal of the bridge cable, the cable force compensation value of the environment temperature of the bridge is combined, the real-time cable force of the bridge cable is obtained, when the real-time cable force is in a safe state, based on the cable history cable force time sequence vector, the correlation coefficient between each cable and the cables on the same side is obtained, the corresponding cables on the same side are determined, the cable force time sequence synchronization degree between the cables on the same side and the cable force time sequence deviation value and the deviation direction between the symmetrical cables are obtained in a comparison mode, whether each cable has the same-side cable force cooperativity and the symmetrical cable force cooperativity or not is judged, the overall safety performance of the bridge cable is diagnosed based on the judging result, and the reliability of the overall safety performance diagnosis of the bridge cable is improved by comprehensively evaluating the stress balance state of the bridge cable group, so that data support is provided for preventive operation and maintenance of the bridge.

Inventors

LIANG JUNHUI
CHEN YUBING
LI HUA
DENG JUN
LIU ZHIQIANG
ZHU PENGFEI
HUANG HUI
Liu Feiyao

Assignees

湖南高速工程咨询有限公司

Dates

Publication Date: 20260512
Application Date: 20260303

Claims (7)

1. Real-time monitoring system of bridge cable power, characterized by, include: The real-time cable force acquisition module is used for determining initial cable force according to the vibration frequency signal of the bridge cable and acquiring the real-time cable force of the bridge cable by combining the cable force compensation value of the environment temperature of the bridge; The cable force safety judging module judges whether the real-time cable force is in a safety state, and when the real-time cable force is in the safety state, the cable force safety judging module invokes the historical cable force data of the bridge cable to generate a historical cable force time sequence vector; the cable association determining module is used for acquiring the correlation coefficient between each cable and the cables on the same side based on the historical cable force time sequence vector of each cable of the bridge and determining the corresponding cable on the same side based on the correlation coefficient; The historical cable force comparison module is used for comparing the historical cable force time sequence vectors of the cables and the cables associated with the same side and the symmetrical cables respectively to obtain the cable force time sequence synchronization degree between the cables on the same side and the cable force time sequence deviation value and deviation direction between the symmetrical cables; the stay cable collaborative analysis module judges whether each stay cable has the same-side cable force cooperativity and the symmetrical cable force cooperativity, and diagnoses the overall safety performance of the bridge stay cable based on the judging result; The cable force time sequence synchronization degree acquisition mode between the same-side inhaul cables is as follows: Extracting time and cable force variation amplitude of all cable force variation nodes in historical cable force time sequence vectors of each cable and cables associated with the same side of each cable, matching all cable force variation nodes, calculating time difference among all cable force variation nodes, and counting average value of all time differences; obtaining cable force variation amplitude ratios of all cable force variation nodes, screening cable force variation nodes with cable force variation amplitude ratios conforming to the cable force amplitude ratios set between corresponding cables and associated cables on the same side of the corresponding cables, and marking the cable force variation nodes as anastomotic cable force variation nodes; Counting the proportion of the coincident cable force change nodes to the total cable force change nodes, and comprehensively evaluating by combining the time difference average value to obtain the cable force time sequence synchronization; the acquisition modes of the cable force time sequence deviation value and the deviation direction between the symmetrical inhaul cables are as follows: selecting historical cable force time sequence vectors of each cable and the symmetrical cable thereof, aligning all instantaneous cable forces in the two historical cable force time sequence vectors according to time stamps, and calculating cable force time sequence deviation values of the time stamps; Judging the cable force deviation direction of each cable and each timestamp of the symmetrical cable according to the positive and negative conditions of the cable force instantaneous deviation value of each timestamp; Judging whether each inhaul cable has the same side cable force cooperativity and the symmetrical cable force cooperativity or not, and specifically comprising the following steps: Extracting the cable force time sequence synchronicity of each cable and the cables associated with the same side of the cable, constructing a cooperativity analysis matrix, and determining a reasonable distribution interval of the cable force time sequence synchronicity of the same side cable group by combining the average value and standard deviation of the cable force time sequence synchronicity of the same side cable group; If the cable force time sequence synchronicity of a certain cable and all cables associated with the same side of the cable are in a reasonable distribution interval, judging that the cable has the same-side cable force cooperativity, otherwise, judging that the cable does not have the same-side cable force cooperativity; If the cable force time sequence deviation values of the time stamps between a certain cable and the symmetrical cable are all in the range of the corresponding allowable cable force deviation values, judging that the cable has symmetrical cable force cooperativity, and if the cable force time sequence deviation values of the continuous time stamps between the certain cable and the symmetrical cable are out of the range of the corresponding allowable cable force deviation values and the cable force deviation directions of the continuous time stamps are consistent, judging that the cable does not have symmetrical cable force cooperativity.
2. The real-time monitoring system of bridge cable force according to claim 1, wherein the real-time cable force acquisition module comprises the following specific contents: Collecting real-time vibration frequency signals of all monitoring points distributed on a bridge inhaul cable, filtering and denoising the real-time vibration frequency signals, extracting natural vibration frequency from the processed real-time vibration frequency signals, and screening the maximum natural vibration frequency; based on the maximum natural frequency and the structural parameters of the inhaul cable, calculating to obtain initial cable force through cable force theory; Extracting cable force historical monitoring data of a cable in a bridge historical database, determining a mapping relation between an ambient temperature and a cable force compensation value, and obtaining a corresponding cable force compensation value according to the ambient temperature of the bridge; and carrying out fusion calculation on the initial cable force and the cable force compensation value to obtain the real-time cable force of the bridge cable.
3. The real-time monitoring system for bridge cable force according to claim 2, wherein the mapping relation between the ambient temperature and the cable force compensation value is determined by: Extracting recent cable force historical monitoring data from a bridge historical database, and acquiring the natural vibration frequency, the historical cable force and the historical environmental temperature of the cable in the historical monitoring data; Based on the historical cable force and the natural vibration frequency of the cable, reversely pushing and analyzing to obtain a cable force compensation value of the cable affected by temperature; Removing abnormal values of cable force compensation values of all cables affected by temperature under each historical environment temperature, and carrying out average calculation on the rest cable force compensation values to obtain average cable force compensation values; and establishing a mapping relation database of the ambient temperature and the cable force compensation value by taking the ambient temperature as an independent variable and taking the average cable force compensation value as an independent variable.
4. The real-time monitoring system for bridge cable force according to claim 3, wherein the method is characterized by obtaining a corresponding cable force compensation value according to the environmental temperature of the bridge, and comprises the following steps: When the environmental temperature of the bridge is acquired, if the environmental temperature of the bridge is matched with a certain environmental temperature point in the mapping relation database, a cable force compensation value of the environmental temperature point is taken as a cable force compensation value corresponding to the environmental temperature of the bridge; And if the environment temperature of the bridge is between two adjacent environment temperature points in the mapping relation database, calculating the cable force compensation value corresponding to the adjacent environment temperature points by adopting a linear interpolation method to obtain the cable force compensation value corresponding to the environment temperature of the bridge.
5. The real-time monitoring system of bridge cable force according to claim 1, wherein the cable force safety judging module comprises the following specific contents: If the real-time cable force of the bridge cable is larger than the rated safety cable force of the cable, judging that the real-time cable force of the bridge cable is in a dangerous state, synchronously generating early warning information and pushing the early warning information; Otherwise, the historical cable force data of the bridge cable in a preset time period are called, and the historical cable force data are ordered according to the time stamp sequence to form a historical cable force time sequence vector.
6. The real-time monitoring system for bridge cable force according to claim 5, wherein the method for determining the corresponding same-side associated cable of each cable is as follows: Selecting historical cable force time sequence vectors of each cable of the bridge and the cables on the same side of the bridge from a bridge historical database, and calculating the correlation coefficient of the historical cable force time sequence vectors between each cable and the cables on the same side of the bridge by adopting the Pearson correlation coefficient; if the correlation coefficient of the historical cable force time sequence vector between a certain cable and the cables on the same side is larger than the set correlation coefficient, the cables on the same side are marked as related cables on the same side, and the related cables on the same side corresponding to each cable are counted.
7. The real-time monitoring system for bridge cable force according to claim 1, wherein the step of diagnosing the overall safety of the bridge cable comprises the steps of: When a certain inhaul cable does not have the cooperativity of the rope forces at the same side or does not have the cooperativity of the rope forces at the same side, the inhaul cable is marked as an abnormal inhaul cable, and the number of the abnormal inhaul cables is counted; If the number of the abnormal inhaul cables is unique, judging that the overall safety performance of the bridge inhaul cables is qualified, and carrying out early warning pushing on the position number of the abnormal inhaul cables; Otherwise, when a plurality of abnormal inhaul cables do not have the same-side cable force cooperativity and the same-side association does not exist among the plurality of abnormal inhaul cables, the overall safety performance of the bridge inhaul cable is judged to be qualified, and when a plurality of abnormal inhaul cables do not have the same-side cable force cooperativity and the same-side association exists among the plurality of abnormal inhaul cables, the overall safety performance of the bridge inhaul cable is judged to be unqualified; when a plurality of abnormal inhaul cables do not have symmetrical cable force cooperativity, the overall safety performance of the bridge inhaul cable is judged to be unqualified.

Description

Real-time monitoring system for cable force of bridge inhaul cable Technical Field The invention relates to the technical field of bridge structure safety monitoring, in particular to a real-time monitoring system for bridge inhaul cable force. Background The inhaul cable is used as a key bearing member of the cable-stayed bridge and bears alternating load and environmental erosion for a long time, and the change of the cable force state directly reflects the health condition of the bridge structure. Along with the increase of the service time of the bridge, the inhaul cable faces the influences of material aging, environmental temperature change and the like, the inhaul cable force is monitored in real time, the integral safety performance of the inhaul cable is evaluated, and the inhaul cable has important engineering value for preventing bridge structural accidents and guiding maintenance and repair decisions. In the prior art, chinese patent publication No. CN115931199A discloses a bridge cable force measuring method based on the combination of thunder and lightning, which realizes synchronous measurement of cable forces of various cables by acquiring radar vibration information of various cables and video vibration information of a certain cable in a radar coverage range, extracting vibration fundamental frequency through vibration information matching and position determination and combining Fourier transformation, and finally determining cable force of various cables. The prior art has the following problems that 1, the cable force is directly calculated according to the vibration frequency, the influence of the environmental temperature change on the elastic modulus and the thermal expansion and contraction effect of the cable material is not considered, so that the cable force calculation result has temperature drift errors, the cable force monitoring accuracy is influenced, the cable force safety state can be misjudged or missed judged, and the reliability of bridge safety evaluation is reduced. 2. In the prior art, the cable force of each cable is measured in a thunder-visual combination mode, but only independent cable force values of each cable can be obtained, analysis of cable force time sequence relativity between cables on the same side and between symmetrical cables is lacking, collaborative working performance of cable groups cannot be evaluated, the integral safety state of a bridge cable is difficult to diagnose, cable force abnormality of a single cable can be found, and bridge integral structure risks caused by collaborative failure of a plurality of cables cannot be early warned. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides a real-time monitoring system for the cable force of a bridge cable, which improves the cable force monitoring precision through temperature compensation, combines the cooperative analysis among cables to realize the overall safety performance diagnosis, and ensures the safety of the overall structure of the bridge. The technical scheme includes that the real-time monitoring system for the cable force of the bridge cable comprises a real-time cable force acquisition module, a cable force safety judgment module, a cable association determination module, a historical cable force comparison module and a cable collaborative analysis module. The connection relation among the modules is that the real-time cable force acquisition module is connected with the cable force safety judgment module, the cable association determination module is respectively connected with the cable force safety judgment module and the historical cable force comparison module, and the cable collaborative analysis module is connected with the historical cable force comparison module. And the real-time cable force acquisition module is used for determining initial cable force according to the vibration frequency signal of the bridge cable and acquiring the real-time cable force of the bridge cable by combining the cable force compensation value of the environment temperature of the bridge. And the cable force safety judging module is used for judging whether the real-time cable force is in a safety state, and when the real-time cable force is in the safety state, the historical cable force data of the bridge cable are called to generate a historical cable force time sequence vector. And the cable association determining module is used for acquiring the correlation coefficient between each cable and the cables on the same side based on the historical cable force time sequence vector of each cable of the bridge and determining the corresponding cable on the same side based on the correlation coefficient. And the historical cable force comparison module is used for comparing the historical cable force time sequence vectors of the cables and the same-side associated cables and the symmetrical cables respectively to obtain the cable force time seque