Damaged cable identification method based on spatial coordinate monitoring of support generalized displacement and temperature change

Abstract

The invention discloses a damaged cable identification method based on spatial coordinate monitoring of support generalized displacement temperature change. On the basis of spatial coordinate monitoring, whether a mechanical calculation benchmark model of a cable structure needs to be updated is determined by support generalized displacement, a cable structure temperature and an ambient temperature, so that a mechanical calculation benchmark model, in which the support generalized displacement, the cable structure temperature and the ambient temperature are included, of the cable structure is obtained; and a monitored amount change matrix of a unit damage is obtained by calculating on the basis of the model. The non-inferior solution of a current nominal damage vector of a cable system is calculated according to the approximate linear relationship among the monitored amount current numeric vector, the monitored amount current initial numeric vector, the monitored amount change matrix of the unit damage, the scalar of the unit damage and the current nominal damage vector to be solved of the cable system, so that when the support displacement and the temperature change, the position of the damaged cable 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. For convenience, this method expresses this type of structure as a "cable structure". As the ambient temperature changes, the temperature of the cable structure will also change. When the temperature of the cable structure changes, 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 refer to the coordinates of the support about the X, Y, and Z axes a...

AI Technical Summary

Problems solved by technology

In addition to being affected by the health status of the cable system, the monitored quantity is also affected by the temperature change of the cable structure (which often occurs) and the generalized displacement of the cable structure support (which often occurs). Under the condition of generalized displacement of the seat, if the identification of the supporting cable with health problems can be realized based on the monitoring of the monitored quantity, it will be of great value to the safety of the cable structure. At present, there is no public and effective health Monitoring systems and methods address this issue

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