Progressive health monitoring method of cable system based on strain monitoring during support settlement

Abstract

The invention discloses a progressive health monitoring method of a cable system based on strain monitoring during support settlement, which is based on strain monitoring, determines whether to re-update a mechanical calculation baseline model of the structure through monitoring a structure support coordinate, taking into account the approximate linear relationship between the current value vector of the monitored-volume and the initial value vector of the monitored-volume, the unit damage monitored-volume change matrix and the current nominal damage vector. For overcoming the disadvantage, the invention provides the method which means that the linear relationship is segmented to be close to the non-linear relationship; in the method, a large interval is divided into consecutive small intervals, the linear relationship in each of the small intervals is accurate enough, the non-inferior solution of the current cable damage vector can be calculated in the small intervals through the multi-objective optimization algorithm and other appropriate algorithms, accordingly, the location and the damage degree of the damaged-cable can be determined accurately.

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 support settlement, the present invention discloses a progressive method based on strain monitoring to identify the support system of the cable structure (referring to all load-bearing cables, and all supporting rods that only bear tensile loads, for For the sake of convenience, this patent refers to all the supporting components of this type of structure as "cable system", but in fact the cable system not only refers to the supporting cables, but also includes the damaged cables in the rods that only bear tensile loads (for The truss structu...

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 deformation or strain of the cable structure will change. In fact, the change of strain contains the health state information of the cable system, which means that the structure The health status of the structure can be judged by the strain data, and the damaged cable can be identified based on the strain monitoring (the monitored strain is called "monitored quantity" in the present invention, and the "monitored quantity" mentioned later refers to the monitored strain). In addition to being affected by the health status of the cable system, the monitoring quantity will also be affected by the settlement of the support of the cable structure (which often occurs). At present, there is no public and effective health monitoring system and method to solve this problem.

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