Health monitoring method of cable system based on cable force monitoring during bearing angular displacement

Abstract

The health monitoring method of the cable system based on the cable force monitoring during the angular displacement of the support is based on the cable force monitoring. By monitoring the angular coordinates of the structural supports, it is determined whether the mechanical calculation benchmark model of the structure needs to be updated. Only when the angular coordinates of the structural supports change The mechanical calculation benchmark model of the structure is updated to obtain a new mechanical calculation benchmark model of the structure that takes into account the angular displacement of the structural support. On the basis of this model, the change matrix of the unit damage monitored quantity is calculated and obtained. According to the approximate linear relationship between the current value vector of the monitored quantity and the initial vector of the monitored quantity, the change matrix of the monitored quantity per unit damage, the unit damage scalar and the current damage vector of the cable system to be obtained, a suitable multi-objective optimization algorithm can be used The algorithm quickly calculates the non-inferior solution of the current cable damage vector, based on which the position of the damaged cable and its damage degree can be determined more accurately when there is angular displacement of the support.

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, and this type of structure is expressed as a "cable structure" in the present invention for convenience. When there is an angular displacement of the support (for example, the rotation of the support around the coordinate axes X, Y, and Z is actually the angular displacement of the support around the coordinate axes X, Y, and Z), the present invention identifies the cable structure based on cable force monitoring. The supporting system (referring to all load-bearing cables and all supporting members that only bear tensile loads, for the sake of convenience, this patent refers to all supporting components of this type of structure as "cable system", but in fact...

AI Technical Summary

Problems solved by technology

After the health state of the cable system changes, it will cause the change of the measurable parameters of the structure, such as the change of the supporting cable force. In fact, the change of the cable force contains the health state information of the cable system, that is to say, the cable force can be used Data to determine the health status of the structure can be based on cable force monitoring (this invention refers to the monitored cable force as "monitored quantity", and the "monitored quantity" mentioned later refers to the monitored cable force) to identify damaged cables , the monitored quantity is not only affected by the health status of the cable system, but also affected by the angular displacement of the cable structure support (which often occurs). At present, there is no public and effective health monitoring system and method to solve this problem