Damaged cable and support generalized displacement identification method based on strain monitoring of temperature change

Abstract

The invention discloses a damaged cable and support generalized displacement identification method based on strain monitoring of temperature change. The method comprises the following steps of: on the basis of strain monitoring, judging whether a mechanical calculation reference model of a cable structure is required to be updated by monitoring the temperature of the cable structure and environment temperature, and thus obtaining the mechanical calculation reference model of the cable structure, into which the temperature of the cable structure and the environment temperature are recorded; and on the basis of the mechanical calculation reference model, acquiring a unit damage monitored amount unit change matrix by calculation. A non-inferior solution of the current nominal damage vector of an evaluated object is obtained by calculation according to an approximately linear relationship between the current value vector of monitored amount, the current initial value vector of the monitored amount, the unit damage monitored amount unit change matrix, a unit damage or unit generalized displacement vector and the to-be-obtained current nominal damage vector of the evaluated object, so support generalized displacement and a damaged cable can be quickly identified by using an appropriate algorithm such as a multi-target optimization algorithm when the temperature change occurs.

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, when there is a generalized displacement of the support (for example, the generalized displacement of the support refers to the linear displacement of the support along the X, Y, and Z axes and The angular displacement of the support around the X, Y, and Z axes; corresponding to the generalized displacement of the support, the generalized coordinates of the support refer to the coordinates of the support about the X, Y, and Z axes a...

AI Technical Summary

Problems solved by technology

In addition to being affected by the health state of the cable system and the generalized 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 generalized displacement of the support with health problems. At present, there is no public and effective health monitoring system and method to solve this problem.

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