Progressive identification method for slack cables based on hybrid monitoring of angular support displacement and temperature change

Abstract

The invention discloses a progressive identification method for slack cables based on hybrid monitoring of angular support displacement and temperature change. The progressive identification method can be used for deciding whether to update a mechanical calculation reference model of a cable structure through monitoring angular support displacement, a cable structure temperature, an environment temperature and a heath degree of a support cable. A noninferior solution of a current nominal damage vector is rapidly figured out according to an approximate linear relationship existing among a current value vector of a monitored quantity, a current initial value vector of the monitored quantity, a unit damage monitored quantity change matrix and a to-be-solved current nominal damage vector and by virtue of a multi-objective optimization algorithm and the like, therefore, virtual damaged cables can be identified when the angular support displacement and the temperature change exist, and after an actual damaged cable is identified by methods of nondestructive testing and the like, remained virtual damaged cables are the slack support cables; and the to-be-regulated cable lengths of the slack support cables can be determined according to a mechanical equivalent relationship.

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 hybrid monitoring to identify the support system of the cable structure (referring to all load-bearing cables, and all supporting members that only bear tensile loads, for convenience , this patent refers to all s...

AI Technical Summary

Problems solved by technology

In addition to being affected by the health status of the cable system, the monitored quantity is also affected by the temperature change of the cable structure (which often occurs) and the angular displacement of the cable structure support (settlement is the component of the angular displacement in the direction of gravity). Under the conditions of changes and angular 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 will be 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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