Progressive health monitoring method for cable system based on cable force monitoring during support settlement

Abstract

The invention relates to a progressive health monitoring method for a cable system based on cable force monitoring during support settlement; the method based on the cable monitoring decides whether a mechanical calculation standard model of a structure needs to be updated again or not through the coordinates of the support of a monitoring structure, and considers that the linear relationship between the current numerical value vector of the monitored quantity and the initial numerical value vector of the monitored quantity, the changing matrix of the unit damage monitored quantity and the current nominal damage vector is approximated; in order to overcome the defect; the invention provides a method which piecewise approximates to the non-linear relationship by using the linear relationship and divides a big interval into a continuous one-by-one small minimal intervals; the linear relationship in each minimal interval is enough accurate; the noninferior solution of the current cable damage vector can be figured out by using appropriate algorithms such as a multiple target optimization algorithm in each minimal interval; and accordingly, the position and the damage degree of the damage cable can be accurately determined.

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 cable force monitoring to identify the support system of the cable structure (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 the supporting parts 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 ( For the truss structure, the method refers to the damaged memb...

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 amount", and the "monitored amount" 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 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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