Temperature change cable force monitoring based progressive identification method for defective cables and support angular displacement

Abstract

A temperature change cable force monitoring based progressive identification method for defective cables and support angular displacement includes: monitoring cable structure temperature, ambient temperature and health of an evaluation object to determine whether a cable structure mechanical calculation reference model needs to be updated or not so as to obtain a cable structure mechanical calculation reference model considering the cable structure temperature and ambient temperature, and calculating to obtain a varying unit array for monitored quantity of unit damage on the basis of the model. A non-inferior solution of current nominal damage vector of the evaluation object according to an approximately linear relation of current numerical vector of the monitored quantity to current initial numerical vector of the monitored quantity, the varying unit array for monitored quantity of unit damage, unit damage or unit angular displacement vector, and current nominal damage vector of the evaluation object, which expects solution, and accordingly damaged cables, loose cables and support angular displacement can be quickly identified when temperature change occurs.

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 cable force monitoring to identify damaged cables and slack cables in the support system of the cable structure (for truss structures, it means damaged or loose cables that only bear tension Loaded member) and ang...

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 supporting cables and bearing angular 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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