Temperature change and strain monitoring-based problem cable and support angular displacement progressive recognition method

Abstract

A temperature change and strain monitoring-based problem cable and support angular displacement progressive recognition method comprises the following steps: based on strain monitoring, determining whether the mechanical calculation reference model of a cable structure needs to be updated through monitoring cable structure temperature, ambient temperature, and health status of an evaluated object to obtain a mechanical calculation reference model of the cable structure including the cable structure temperature and ambient temperature; on the basis of the model, calculating to obtain unit damage monitored quantity change matrix; and working out a non-inferior solution of current nominal damage vector of the evaluated object according to an approximate linear relation between the monitored quantity current value vector and the monitored quantity current initial value vector, the unit damage monitored quantity change matrix, unit damage scalar and evaluated object current nominal damage vector to be calculated, thus being capable of fast recognizing a damaged cable, a loosened cable and support angular displacement in temperature changing.

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 damaged cables and slack cables in the support system of the cable structure (for truss structures, it refers to damaged or relaxed cables that only bear tensile loads rods) and the a...

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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