Identification method for problem cables and angular support displacement on basis of temperature variation and cable force monitoring

Abstract

The invention provides an identification method for problem cables and angular support displacement on the basis of temperature variation and cable force monitoring. The identification method comprises the following steps of: determining whether to update a mechanical calculation reference model of a cable structure or not through monitoring a cable structure temperature and an environmental temperature, thus obtaining the mechanical calculation reference model of the cable structure, including the cable structure temperature and the environmental temperature; figuring out a unit change matrix of a unit damage monitored quantity on the basis of the reference model; figuring out a non-inferior solution of a current nominal damage vector of an to-be-solved evaluated object according to an approximate linear relation among a current numerical vector of the monitored quantity, a current initial numerical vector of the monitored quantity, the unit change matrix of the unit damage monitored amount, a unit damage or unit angular displacement vector and the current nominal damage vector of the to-be-solved evaluated object; and rapidly identifying the damaged cable, the loosened cable and the angular support displacement according to the relation when the temperatures 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, 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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