Method for identifying damaged cable and support generalized displacement based on hybrid monitoring during temperature variation

Abstract

The invention discloses a method for identifying a damaged cable and support generalized displacement based on hybrid monitoring during temperature variation. The method is based on hybrid monitoring and comprises the following steps of: judging whether needing to update a mechanical calculation benchmark model of a cable structure, by monitoring cable structure temperature and environment temperature; obtaining the mechanical calculation benchmark model of the cable structure, with the cable structure temperature and the environment temperature being taken into account; obtaining a unit damage monitored quantity unit-variation matrix by calculation based on the mechanical calculation benchmark model; calculating the non-inferior solution of a current nominal damage vector of an evaluated object, according to the approximately linear relationships between a current numeric vector of the monitored quantity and a current initial numeric vector of the monitored quantity, the unit damage monitored quantity unit-variation matrix, a unit damage or unit generalized displacement vector, and the to-be-solved current nominal damage vector of the evaluated object; and according to the non-inferior solution, rapidly identifying the support generalized displacement and the damaged cable during temperature variation by proper algorithms such as a multiple-object optimization algorithm.

Description

technical field [0001] Cable structures such as cable-stayed bridges, suspension bridges, and truss cable 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. The common point of such cable structures is Cables, cables, or rods that only bear tensile loads are used as supporting components. For convenience, this method expresses this type of cable structure as "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...

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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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