Progressive health monitoring method for cable system in cable structure based on cable force monitoring

Abstract

Based on the step-by-step type health monitoring method for the cable system in the cable structure of spatial coordinate monitoring, while using the spatial coordinate as monitored quantity, considering the approximation of the linear relation between the current numerical vector of the monitored quantity and the initial numerical vector of the monitored quantity and the linear relation between the unit damaged monitored quantity numerical value change matrix and the current nominal damaged vector, where, while more cable is damaged and / or the damaged degree is larger, the non-linear relation characteristics of the above qualities are more obvious, the invention provides a method for approaching the non-linear relation using linear relation based on spatial coordinate monitoring, which comprises: dividing the large interval into continuous small intervals ensuring the above linear relation in each small interval is accurate enough, calculating out the noninferior solution of the current cable damage vector in each small interval by a proper algorithm such as multiple-objective optimization, and accordingly, the position and damage degree of the damaged cable can be determined accurately.

Description

technical field [0001] Based on the monitoring of spatial coordinates, the present invention discloses a progressive health check for identifying damaged cables in cable systems (referring to all load-bearing cables) of cable structures (especially large cable structures, such as large cable-stayed bridges, suspension bridges) A monitoring method belongs to the field of engineering structure 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 structural health monitoring technology to identify cable systems (especially large cable structures, such as large cable-stayed bridges, suspension bridges) in the cable system The damaged cable is a method with great potential. At present, the structural health monitoring technology mainly monitors the cable force, and identifies the damaged cable and its damage degree according to the change o...

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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