Damaged cable identification method used in case of angular displacement of support and temperature variation on basis of space coordinate monitoring

Abstract

The invention relates to a damaged cable identification method used in case of the angular displacement of a support and the temperature variation on the basis of the space coordinate monitoring. According to the damaged cable identification method, on the basis of the space coordinate monitoring, the angular displacement of the support, the temperatures of cable structures and the environment temperature are monitored to determine whether a mechanical calculation reference model of the cable structures needs to be updated, so as to obtain a mechanical calculation reference model of the cable structures, in which the angular displacement of the support, the temperatures of the cable structure and the environment temperature are counted; on the basis of the new model, a change matrix of a unit damage monitored quantity is obtained by calculation; and according to an approximate linear relation between a current value vector of the monitored quantity and a current initial value vector of the monitored quantity, the change matrix of the unit damage monitored quantity, a unit damage scalar and a current nominal damage vector to be obtained of a cable system, a noninferior solution of the current nominal damage vector of the cable system is calculated, so that when the support has the displacement and the temperature is changed, the positions and the damage degrees of damaged cables can be accurately determined.

Description

technical field [0001] Cable-stayed bridges, suspension bridges, truss structures and other structures have one thing in common, that is, they have many parts that bear tensile loads, such as cable-stayed cables, main cables, slings, tie rods, etc. , cables, or rods that only bear tensile loads are supporting components. For convenience, this method expresses this type of structure as a "cable structure". As the ambient temperature changes, the temperature of the cable structure will also change. When the temperature of the cable structure changes, the angular displacement of the support (such as the rotation of the support around the coordinate axes X, Y, and Z is actually the support angular displacement around the coordinate axes X, Y, Z), this method is based on spatial coordinate monitoring to identify the support system of the cable structure (referring to all load-bearing cables, and all supporting rods that only bear tensile loads, for convenience For the sake of cons...

AI Technical Summary

Problems solved by technology

In addition to being affected by the health status of the cable system, the monitored quantity is also affected by the temperature change of the cable structure (which often occurs) and the angular displacement of the cable structure support (which often occurs). Under the condition of angular displacement of the seat, if the identification of the supporting cables with health problems can be realized based on the monitoring of the monitored quantity, it will be of great value to the safety of the cable structure. At present, there is no public and effective health Monitoring systems and methods address this issue

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