Slack cable progressive identification method on basis of space coordinate monitoring during generalized displacement of support and temperature variation

Abstract

The invention relates to a slack cable progressive identification method on the basis of the space coordinate monitoring during generalized displacement of a support and temperature variation. According to the slack cable progressive identification method, on the basis of the space coordinate monitoring, the generalized displacement of the support, the temperatures of cable structures, the environment temperature and the health degrees of supporting cables are monitored to determine whether a mechanical calculation reference model of the cable structures needs to be updated; according to approximate linear relations between a current value vector of a monitored quantity and a current initial value vector of the monitored quantity, a value change matrix of the unit damage monitored quantity and a current nominal damage vector to be obtained, a noninferior solution of the current nominal damage vector can be rapidly calculated by utilizing algorithms such as a multi-objective optimization algorithm and the like, so that when the support has the generalized displacement and the temperature is changed, virtual damaged cables can be identified; and after real damaged cables are identified from the virtual damaged cables by using a nondestructive testing method and the like, the residual virtual damaged cables are slack supporting cables and the cable lengths of the slack supporting cables, which need to be regulated, can be determined according to a mechanical equivalent relation.

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 will also be affected by the temperature change of the cable structure (which often occurs) and the generalized displacement of the cable structure support (settlement is the component of the generalized displacement in the direction of gravity). Under the conditions of changes and generalized displacement of the cable structure support, if the identification of the supporting cables with health problems can be realized based on the monitoring of the monitored quantity, it is of great value to the safety of the cable structure. At present, there is no one Published, effective health monitoring systems and methods address this issue

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