Method for identifying damaged cable and support translation based on strain monitoring during temperature variation

Abstract

The invention discloses a method for identifying a damaged cable and support translation based on strain monitoring during temperature variation. The method is based on strain 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 translation 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 translation displacement and the damaged cable during temperature variation by proper algorithms such as a multiple-object optimization algorithm.

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 strain 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 state of the cable system and the translational 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 translational displacement of the support cable and 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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