Damaged cable identification method based on mixed monitoring of support generalized displacement and temperature change

Abstract

The invention discloses an identification method for damaged cables based on mixed monitoring of generalized displacement and temperature change of a support. The identification method is based on the mixed monitoring, and can be used for deciding whether to update a mechanical calculation reference model of a cable structure through monitoring the generalized displacement of the support, a cable temperature and an environment temperature, thus obtaining the mechanical calculation reference model of the cable structure including the generalized displacement of the support, the cable temperature and the environment temperature; and then a change matrix of a unit damage monitored quantity is obtained through calculation on the basis of the mechanical calculation reference model. A noninferior solution of a current nominal damage vector of a cable system is figured out according to an approximate linear relationship among a current value vector of a monitored quantity, a current initial value vector of the monitored quantity, the change matrix of the unit damage monitored quantity, a unit damage scalar quantity and the current nominal damage vector of the to-be-solved cable system, therefore, the places and the damage degrees of the damaged cables can be accurately identified when the displacement and temperature of the support change.

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, when there is a generalized displacement of the support (for example, the generalized displacement of the support refers to the linear displacement of the support along the X, Y, and Z axes and The angular displacement of the support around the X, Y, and Z axes; corresponding to the generalized displacement of the support, the generalized coordinates of the support refer to the coordinates of the support about the X, Y, and Z axes a...

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 generalized displacement of the cable structure support. When the temperature of the cable structure changes and the generalized displacement of the cable structure support occurs Under these conditions, if the identification of 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 system and method to solve the problem. this problem

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