Progressive generalized displacement identification method for problem cables and support based on temperature change tension force monitoring

Abstract

The invention discloses a progressive generalized displacement identification method for problem cables and a support based on temperature change tension force monitoring. The progressive generalized displacement identification method is used for deciding whether to update a mechanical calculation reference model of a cable structure through monitoring a cable structure temperature, an environment temperature and a heath state of an evaluated object, thus obtaining the mechanical calculation reference model of the cable structure including the cable structure temperature and the environment temperature; and a unit change matrix of a unit damage monitored quantity is obtained through calculation on the basis of the mechanical calculation reference model. A noninferior solution of a current nominal damage vector of the evaluated object is figured out according to an approximate linear relationship existing among a current value vector of a monitored quantity, a current initial value vector of the monitored quantity, the unit change matrix of the unit damage monitored quantity, a unit damage or unit generalized displacement vector and a current nominal damage vector of the to-be-solved evaluated object, therefore, generalized displacements of the damaged cable, the slack cable and the support can be rapidly identified when temperature changes exist.

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.

Images