Defective cable and support angular displacement progressive identification method based on mixed monitoring of temperature change

Abstract

The invention discloses a defective cable and support angular displacement progressive identification method based on mixed monitoring of temperature change. The method comprises the following steps of: on the basis of mixed monitoring, judging whether a mechanical calculation reference model of a cable structure is required to be updated by monitoring the temperature of the cable structure, environment temperature and the health state of an evaluated object, and thus obtaining the mechanical calculation reference model of the cable structure, into which the temperature of the cable structure and the environment temperature are recorded; and on the basis of the mechanical calculation reference model, acquiring a unit damage monitored amount unit change matrix by calculation. A non-inferior solution of the current nominal damage vector of the evaluated object is obtained by calculation according to an approximately linear relationship between the current value vector of monitored amount, the current initial value vector of the monitored amount, the unit damage monitored amount unit change matrix, a unit damage or unit angular displacement vector and the to-be-obtained current nominal damage vector of the evaluated object, so a damaged cable, a loosened cable and support angular displacement can be quickly identified when the 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 mixed monitoring to identify damaged cables and slack cables in the support system of the cable structure (for truss structures, it means damaged or relaxed cables that only bear tensile loads rods) and the angula...

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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