Method for indentifying loose supporting cable based on strain monitoring during support settlement

Abstract

The invention discloses a method for identifying a loose supporting cable based on strain monitoring during support settlement, which is based on strain monitoring, and determines whether to update a mechanical calculation baseline model of the structure through monitoring a structure support coordinate; the mechanical calculation baseline model of the structure is updated only when the structure support coordinate changes, thereby a new mechanical calculation baseline model which is included in the structure of the structure support settlement is obtained, and a unit damage monitored-volume change matrix is calculated and obtained on the basis of the model. According to the approximate linear relationship between the strain current vector and the strain initial vector, the virtual unit damage strain change matrix and the current virtual damage vector, the virtual damaged cable can be calculated and identified, after the real damaged-cable is identified through a non-damaged test method, the remained virtual damaged cable is the loose cable, the cable force of which needs adjusting, and the cable length needing adjusting can be determined according to the relationship between the loose degree and the virtual damaged degree.

Description

technical field [0001] When there is support settlement, the present invention recognizes the cable force to be adjusted in the cable system (referring to all supporting cables) of cable-supported structures (especially large-scale cable structures, such as large-scale cable-stayed bridges and suspension bridges) based on the monitoring of strain equivalence. The supporting cable and the specific cable length adjustment amount are given, which belong to the field of engineering structure safety. 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 relaxation and other reasons, the cable force of the supporting cables usually changes after a period of time after the completion of the new structure, and the structure has been in service for a long time. Later, the relaxation of the supporting cables will also cause changes in the cable...

AI Technical Summary

Problems solved by technology

[0003] When the health state of the supporting cable system changes (such as relaxation, damage, etc.), in addition to the change of the cable force, it will also cause changes in other measurable parameters of the structure, such as changes in the deformation or strain of the cable structure, In fact, the change of strain includes the health status information of the cable system, that is to say, the health status of the structure can be judged by using the structural strain data, and it can be based on strain monitoring (the monitored strain is referred to as "monitored quantity" in the present invention, which will be mentioned later. The "monitored quantity" refers to the monitored strain) to identify the damaged cable. The monitored quantity is not only affected by the health status of the cable system, but also affected by the settlement of the cable structure support (which often occurs). None of the public, effective health monitoring systems and methods address this issue

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