Problematic cable and support angular displacement identifying method based on strain monitoring at time of temperature change

Abstract

The invention relates to a problematic cable and support angular displacement identifying method based on strain monitoring at the time of temperature change. The method comprises the following steps: based on strain monitoring, determining whether a mechanical calculation reference model of a cable structure needs to be updated through monitoring cable structure temperature and environment temperature so as to obtain a mechanical calculation reference model of the cable structure in which the cable structure temperature and the environment temperature are included; and based on the model, performing calculation to obtain an unit damage monitored quantity unit change matrix; calculating a non-inferior solution of the conventional nominal damage vector of an evaluated object according to the approximate linear relationship existing between the monitored quantity current numerical value vector, and monitored quantity current initial numerical valve vector, unit damage monitored quantity unit change matrix, unit damage or angular displacement vector and to-be-solved evaluated object current nominal damage vector; and on the basis, rapidly identifying a damaged cable, a slack cable and the support angular displacement at the time of temperature 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 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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