Strain monitoring-based progressive method for identifying slack cables during generalized displacement of support saddle

Abstract

The invention relates to a strain monitoring-based progressive method for identifying slack cables during generalized displacement of a support saddle, and is based on strain monitoring and performed by monitoring generalized coordinates of the support saddle of the structure. When slack support cables are identified, in view of the situation that the linear relation between a current numerical value vector of a monitored quantity and an initial numerical value vector of the monitored quantity is similar to that between a numerical value change matrix of the monitored quantity of virtual unitinjures and a current nominal virtual injury vector, the method of approaching the non-linear relation in a sectional manner by using the linear relation is given out for overcoming the defect, then virtually injured cables can be identified, after really injured cables are identified by using the non-destructive detection and other methods, the remaining virtually injured cables are the slack support cables and the cable length which needs to be adjusted can be determined according to the relation between the slack degree and the virtual injure degree.

Description

technical field [0001] When there is a generalized displacement of the support (for example, the generalized displacement of the support refers to the linear displacement of the support along the X, Y, and Z axes and the angular displacement of the support around the X, Y, and Z axes; corresponding to the generalized displacement of the support, the generalized coordinates of the support Refers to the coordinates of the support about the X, Y, and Z axes and the angular coordinates of the support about the X, Y, and Z axes), the present invention identifies cable-supported structures (especially large-scale cable structures, such as large-scale Cable-stayed bridges, suspension bridges) in the cable system (referring to all supporting cables) of the supporting cables that need to adjust the cable force, and give the specific cable length adjustment amount, which belongs to the field of engineering structure safety. Background technique [0002] The cable system is usually a k...

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Problems solved by technology

[0003] Changes in the health state of the supporting cable system (such as relaxation, damage, etc.) will cause changes in the measurable parameters of the structure, such as the deformation or strain of the cable structure will change. In fact, the change of strain includes the health of the cable system State information, that is to say, the health status of the structure can be judged by using the structural strain data, which can be based on strain monitoring (the monitored strain is called "monitored quantity" in the present invention, and the "monitored quantity" mentioned later refers to the monitored strain) to identify damaged cables, the monitored quantity is not only affected by the health status of the cable system, but also affected by the generalized displacement of the cable structure support (which often occurs), and there is no public and effective health monitoring Systems and methods address this problem

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