Progressive health monitoring method of cable system based on mixed monitoring in presence of support seat settlement

Abstract

The invention provides a progressive health monitoring method of cable system based on mixed monitoring in the presence of support seat settlement. Whether a mechanical calculation standard model with a re-updated structure is needed or not is determined on the basis of the mixed monitoring through monitoring the coordinates of a structure support seat, the fact that the current monitored value vectors have the approximate linear relationship with the monitored initial vector, the unit damage monitored quantity change matrices and the current nominal damage vector is taken into consideration.In order to overcome the defect, the invention provides a method for piecewise approximation to the non-linear relationship by using the linear relationship, a large interval is divided into small continuous intervals, the linear relationship in the small intervals is accurate enough, proper algorithms of the multi-objective optimization algorithm and the like can be utilized in each small interval for calculating the noninferior solution of the current cable damage vector, and thereby, the position and the damage degree of the damaged 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. The present invention discloses a progressive method, based on hybrid monitoring, to identify the support system of the cable structure (referring to all load-carrying cables, and all supporting members bearing only 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 structure refers to the method of dam...

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 cable force, the deformation or strain of the cable structure, the shape or spatial coordinates of the cable structure, and the Changes in the angular coordinates of any imaginary straight line at each point of the structure (for example, changes in the angular coordinates of any straight line passing through the point in the tangent plane of any point on the surface of the structure, or changes in the angular coordinates of the normal line at any point on the surface of the structure change), all of these changes include the health status information of the cable system, so the health status of the structure can be judged through the mixed monitoring of the changes in the characteristic parameters of these different types of structures, and the present invention combines all monitored structural features The parameters are collectively referred to as "monitored quantities". Since the monitored quantities are composed of different types of measurable parameters of the structure, the present invention calls this mixed monitoring. The monitored quantities are not only affected by the health status of the cable system, but also Will be affected by the settlement of the cable structure support (which often occurs), and there is no public and effective health monitoring system and method to solve this problem

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