Progressive method for distinguishing slack supporting cable based on mixed monitoring during support settlement

Abstract

The invention relates to a progressive method for distinguishing a slack supporting cable based on multi-class parameter mixed monitoring during support settlement; when being used for distinguishing the slack supporting cable, the method 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 numerical value changing matrix of the virtual unit damage monitored quantity and the current nominal virtual damage vector is approximated by the coordinates of the support of a monitoring structure; in order to overcome the defect, a method for piecewise approximating the non-linear relationship by using the linear relationship can distinguish the virtual damage cable; after the true damaged cable is distinguished by using the nondestructive testing method and the like, the left virtual damaged cable is the slack supporting cable; and the length of the cable needing to be regulated can be determined according to the relationship between the slack degree and the virtual damage degree.

Description

technical field [0001] The present invention discloses a progressive approach, based on hybrid monitoring, to identify cable systems (referring to all supporting cables) of cable-supported structures (especially large cable-supported structures, such as large cable-stayed bridges, suspension bridges) when there is support settlement The support cable whose cable force needs to be adjusted, and the specific cable length adjustment amount are given, which belongs to the field of engineering structure safety. Background technique [0002] The cable system is usually a key component of cable structures (especially large cable structures, such as large cable-stayed bridges and suspension bridges). Due to relaxation and other reasons, the cable force of the supporting cables usually changes after a period of time after the completion of the new structure, and the structure has been in service for a long time. Later, the relaxation of the supporting cables will also cause changes i...

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Problems solved by technology

[0003] Changes in the health status of the supporting cable system (such as relaxation, damage, etc.) will cause changes in the measurable parameters of the structure, such as changes in the cable force, which will affect the deformation or strain of the cable structure, and will affect the cable structure. The shape or space coordinates will cause the change of the angular coordinates of any imaginary straight line passing through each point of the cable structure (for example, the change of the angular coordinates of any straight line passing through the point in the tangent plane of any point on the structure surface, or the change of the angular coordinates of any straight line passing through the point on the structure surface Changes in the angular coordinates of the normal at any point), 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, In the present invention, all the monitored structural characteristic parameters are collectively referred to as "monitored quantities". Since the monitored quantities are composed of different types of measurable parameters of the structure at this time, the present invention calls this mixed monitoring. In addition to the influence of the health status of the cable system, it 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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