Problem cable and supporting seat generalized displacement identification method based on space coordinate monitoring at moment of temperature variation

Abstract

The invention relates to a problem cable and supporting seat generalized displacement identification method based on space coordinate monitoring at moment of temperature variation, which is based on the space coordinate monitoring. The method is characterized in that whether a mechanical calculation benchmark model of a cable structure is required to update or not is determined by monitoring the temperature of the cable structure and the ambient temperature, the mechanical calculation benchmark model of the cable structure counting the temperature of the cable structure and the ambient temperature is obtained, and a unit damage monitored parameter unit variation matrix is obtained through calculation on the basis of the model. The non-inferior solution of a moment nominal damage vector of an estimated target is calculated according to an approximate linear relation respectively between a monitored parameter moment numerical value vector and a monitored parameter moment initial numerical value vector and between the unit damage monitored parameter unit variation matrix, unit damage or a unit generalized displacement vector and the moment nominal damage vector of the estimated target to be solved, and thus a damaged cable, a loosened cable and the supporting seat generalized displacement can be quickly identified when the temperature is changed.

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 structure, the monitored quantity will also be affected by the temperature change of the cable structure (which often occurs). The identification of support cables and support generalized displacements with health problems is of great value to the safety of cable structures. At present, there is no public and effective health monitoring system and method to solve this problem.

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