Problem cable and support translation progressive identification method on basis of cable force monitoring during temperature variation

Abstract

The invention relates to a problem cable and support translation progressive identification method on the basis of the cable force monitoring during temperature variation. According to the problem cable and support translation progressive identification method, on the basis of the cable force monitoring, the temperatures of cable structures, the environment temperature and the health state of an evaluated object 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 temperatures of the cable structures and the environment temperature are counted; on the basis of the model, a unit change matrix of a unit damage monitored quantity is obtained by calculation; according to approximate linear relations between a current value vector of the monitored quantity and a current initial value vector of the monitored quantity, the unit change matrix of the unit damage monitored quantity, a unit damage or unit translation displacement vector and a current nominal damage vector to be obtained of the evaluated object, a noninferior solution of the current nominal damage vector of the evaluated object is calculated, so that when the temperature is changed, damaged cables, slack cables and the translation displacement of a support can be rapidly identified.

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, this method is based on cable force monitoring to identify damaged cables and loose cables in the support system of the cable structure (for truss structures, it is Refers to the damaged or loose rods that only bear the tensile load) and the translational displacement of the support, which belongs to the field of engineering structure health monitoring. The supporting system of the cable structure refers to all load-bearing cables ...

AI Technical Summary

Problems solved by technology

In addition to being affected by the health status of the cable structure, the monitored quantity will also be affected by the temperature change of the cable structure (which often occurs). The identification of support cables and support translational displacements with health problems is of great value to the safety of cable structures. At present, there is no public and effective health monitoring system and method to solve this problem.

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