Progressive health monitoring method for cable structure median cord system based on strain monitoring

Abstract

The invention provides a progressive health detecting method for a cable system in a cable structure based on straining detection, which considers that the linear relations among a current numerical vector of a detected vector, an initial numerical vector of the detected vector, a numerical variation matrix of a unit damaged detected vector and a current nominal damaged vector are similar on the premise that straining is the detected vector, particularly when damaged cables are more and have large damage extent, the non-linear relations among the vectors have more obvious characteristics. In order to overcome the defect, the invention provides the method for piecewise approximating the non-linear relations by the linear relations based on straining detection, divides a large section into a plurality of continuous small sections, makes the linear relationsenough accurate in each small section, and can calculate a noninferior solution of the current cable damaged vector by a multiobjective optimization algorithm and other proper algorithms in each small section, thereby accurately determining the position of a damaged cable and damage extent thereof.

Description

Technical field [0001] The present invention is based on strain monitoring, and discloses a progressive health monitoring system for identifying damaged cables in cable structures (especially large cable structures, such as large cable-stayed bridges and suspension bridges) (referring to all load-bearing cables). The method belongs to the field of engineering structural health monitoring. Background technique [0002] The cable system is usually a key component of the cable structure, and its failure often leads to the failure of the entire structure. Based on the structural health monitoring technology to identify the cable structure (especially large cable structures, such as large cable-stayed bridges, suspension bridges) in the cable system The damaged cord is a very promising method. At present, the structural health monitoring technology mainly uses the monitoring of the cable force to identify the damaged cable and its degree of damage according to the change of the cable ...

AI Technical Summary

Problems solved by technology

However, as far as a single cable is concerned, the change of its cable force has a clear and monotonous relationship with its health status (damage degree). However, when the cable is a cable structure (especially a large cable structure, such as a large cable-stayed bridge, When one of the cable systems of a suspension bridge), since the change of the cable force of each specific cable is not only affected by its own health status, but also affected by the health status of other cables, the cable force of each specific cable is observed Even under the condition of the same health status of the cable (same damage degree or no damage), the phenomenon of the change of its cable force, which is positive and negative, large and small, will be monitored, which is very important for the identification of damaged cables. very unfavorable

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