Damaged cable and support angular displacement progressive identification method used in case of temperature variation on basis of strain monitoring

Abstract

The invention relates to a damaged cable and support angular displacement progressive identification method used in case of the temperature variation on the basis of the strain monitoring. According to the damaged cable and support angular displacement progressive identification method, on the basis of the strain monitoring, the angular displacement of a support, the temperatures of cable structures, the environment temperature and the damage degrees of damaged cables are monitored to determine whether a mechanical calculation reference model of the cable structures needs to be updated, so as to obtain a novel mechanical calculation reference model of the cable structures, in which the angular displacement of the support, the damage degrees of the damaged cables and the temperature are counted; on the basis of the model, according to an approximate linear relation between a current value vector of a monitored quantity and a current initial value vector of the monitored quantity, a value unit change matrix of the unit damage monitored quantity and a current nominal damage vector to be obtained, when the temperature is changed, the damaged cables and the angular displacement of the support can be accurately identified.

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 the support system of the cable structure (referring to all load-bearing cables, and all supporting members that only bear tensile loads, for convenience , this patent refers to all s...

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Problems solved by technology

In addition to being affected by the health status of the cable system and the angular 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 angular 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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