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

Abstract

The invention relates to an incremental health monitoring method in a cable system of a cable structure based on hybrid monitoring, which takes that linear relation between current value vectors of values to be monitored and initial value vectors of the values to be monitored, and the linear relation between unit damage value change arrays of the values to be monitored and current nominal damage vectors are similar into consideration on the premise of taking various parameters as values to be monitored, in particular when damaged cables are more or damage extent is larger, the linear relationcharacteristic is more obvious. In order to overcome the defect, the invention provides a method for using the linear relations to perform piecewise approximation on nonlinear relations based on the hybrid monitoring, divides a large interval into a plurality of continuous small intervals; in the small intervals, the linear relations are accurate enough and proper algorithms such as multiobjective optimization algorithm are utilized to calculate noninferior solutions of current cable damage vectors, and then positions of the damaged cables and the damage extent of the cables are determined accurately.

Description

technical field Based on the mixed monitoring of multiple types of parameters, the present invention discloses a progressive method 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 and suspension bridges) A health monitoring method belongs to the field of engineering structure health monitoring. Background technique 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 chang...

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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