Temperature variation space coordinate monitoring problem cable and support saddle angular displacement progressive identification method

Abstract

The invention relates to a temperature variation space coordinate monitoring problem cable and support saddle angular displacement progressive identification method. According to the method disclosed by the invention, space coordinate monitoring is based, and the method comprises the following steps of: deciding whether a mechanical calculation benchmark model of a cable structure needs to be updated or not by monitoring the temperature of the cable structure, the ambient temperature and the health status of an evaluated object, getting the mechanical calculation benchmark model of the cable structure, which reckons in the temperature of the cable structure and the ambient temperature, and calculating on the basis of the model for getting a unit damage monitored quantity unit variation matrix; and calculating a noninferior solution of a current nominal damage vector of the evaluated object according to an approximate linear relation existing among a current numerical value vector of monitored quantity, a current initial numerical value vector of the monitored quantity, the unit damage monitored quantity unit variation matrix, a unit damage or unit angular displacement vector and the current nominal damage vector of the evaluated object to be solved, and accordingly rapidly identifying damaged cables, slack cables and support saddle angular displacement when the temperature changes.

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 spatial coordinate 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) ...

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.

Images