Slack cable identification method on basis of angle monitoring during support settlement and temperature variation

Abstract

The invention relates to a slack cable identification method on the basis of the angle monitoring during support settlement and temperature variation. According to the slack cable identification method, on the basis of the angle monitoring, the translation displacement of a support, 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 translation displacement of the support, the temperatures of the cable structures and the environment temperature are counted; on the basis of the model, a change matrix of a unit damage monitored quantity is obtained by calculation; 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 change matrix of the unit damage monitored quantity, a unit damage scalar and a current nominal damage vector to be obtained of a cable system, a noninferior solution of the current nominal damage vector of the cable system is calculated; and after real damaged cables are identified by a nondestructive testing method, the residual cables with the health problem are slack cables.

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, this method is based on angle monitoring to identify the supporting system of the cable structure (referring to all load-bearing cables and all supporting For the rods under tensile load, for the sake of convenience, this patent refers to all supporting components of this type of structure as "cable system", but in fact, the cable system not only refers to the supporting cables, but also includes rods that only bear tensile loads ,...

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 translational displacement of the cable structure support (settlement is the component of the translational displacement in the direction of gravity). Under the conditions of changes and translational 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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