Damaged cable and support angular displacement identification method on basis of strain monitoring during temperature variation

Abstract

The invention relates to a damaged cable and support angular displacement identification method on the basis of the strain monitoring during temperature variation. According to the damaged cable and support angular displacement identification method, on the basis of the strain monitoring, the temperatures of cable structures and the environment temperature 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; and 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 angular displacement vector and a current nominal damage vector to be obtained of an evaluated object, a noninferior solution of the current nominal damage vector of the evaluated object is calculated, so that when the temperature is changed, the angular displacement of a support and damaged cables can be rapidly identified by utilizing suitable algorithms such as a multi-objective optimization algorithm and the like.

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 strain 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 and the angular displacement of the support, the monitored quantity will also be affected by the temperature change of the cable structure (which often occurs). Under the condition that the temperature of the cable structure changes, if the monitored quantity can It is of great value to the safety of the cable structure to realize the identification of the support cable and the angular displacement of the support with health problems. At present, there is no public and effective health monitoring system and method to solve this problem.

Images