A Progressive Method for Identifying Slack Cables Based on Strain Monitoring During Angular Displacement of Bearings

Abstract

The invention discloses a progressive method for distinguishing a slack cable based on strain monitoring in the angular displacement of a supporting seat. Based on the strain monitoring and through monitoring an angular coordinate of the supporting seat of a structure, when the progressive method is used for distinguishing a slack supporting cable, the condition that the linear relations between a current numerical vector of a monitored quantity and an initial numerical vector of the monitored quantity, as well as between a virtual unit damage numerical change matrix of the monitored quantityand a current nominal virtual damage vector are approximate is considered; in order to overcome the defect, a method for piecewise approaching a nonlinear relation by using the linear relations is given; a virtual damaged cable can be distinguished; after a real damaged cable is identified by using methods such as nondestructive examination and the like, the residual virtual damaged cable is the slack supporting cable; and according to the relation between a slackness degree and a virtual damage degree, the length of the cable needing to be adjusted can be determined.

Description

technical field [0001] When there is an angular displacement of the support (for example, the rotation of the support around the coordinate axes X, Y, and Z is actually the angular displacement of the support around the coordinate axes X, Y, and Z), the present invention identifies based on the monitoring of strain equivalents The support cables in the cable system (referring to all support cables) of cable support structures (especially large-scale cable structures, such as large cable-stayed bridges and suspension bridges) that need to adjust the cable force, and give specific cable length adjustments, which belong to engineering structures security area. Background technique [0002] The cable system is usually a key component of cable structures (especially large cable structures, such as large cable-stayed bridges and suspension bridges). Due to reasons such as relaxation, the cable force of the supporting cables usually changes after a period of time after the completi...

AI Technical Summary

Problems solved by technology

[0003] Changes in the health status of the supporting cable system (such as relaxation, damage, etc.) will cause changes in the measurable parameters of the structure, such as changes in the deformation or strain of the cable structure. In fact, changes in strain include the health of the cable system State information, that is to say, the health status of the structure can be judged by using the structural strain data, which can be based on strain monitoring (the monitored strain is called "monitored quantity" in the present invention, and the "monitored quantity" mentioned later refers to the monitored Strain) to identify damaged cables. The monitored quantity is not only affected by the health status of the cable system, but also affected by the angular displacement of the cable structure support (which often occurs). At present, there is no public and effective health monitoring Systems and methods address this problem