Identification method of slack cables based on spatial coordinate monitoring during support settlement and temperature change

Abstract

The invention discloses a method for identifying a slack cable based on space coordinate monitoring during support settlement and temperature variation. The method is based on space coordinate monitoring and comprises the following steps of: judging whether needing to update a mechanical calculation benchmark model of a cable structure by monitoring support translation displacement, cable structure temperature and environment temperature; obtaining the mechanical calculation benchmark model of the cable structure with the support translation displacement, the cable structure temperature and the environment temperature being taken into account; obtaining a unit damage monitored quantity variation matrix by calculation based on the mechanical calculation benchmark model; calculating the non-inferior solution of a current nominal damage vector of a cable system, according to the approximately linear relationships between a current numeric vector of the monitored quantity and a current initial numeric vector of the monitored quantity, the unit damage monitored quantity variation matrix, a unit damage scalar, and the to-be-solved current nominal damage vector of the cable system; and identifying actually-damaged cables with a non-destructive inspection method and then identifying the rest of cables with health problems as slack cables.

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, this method identifies the supporting system of the cable structure based on spatial coordinate monitoring (referring to all load-bearing cables and all supporting For the rods bearing tensile load, for the sake of convenience, this patent refers to all supporting components of this type of structure as "cable system", but in fact the cable system not only refers to supporting cables, but also includes rods that only bear tensile lo...

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 translational displacement of the cable structure support (settlement is the component of the translational displacement in the direction of gravity). Under the conditions of changes and translational displacement of the cable structure support, if the identification of the supporting cables 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 one Published, effective health monitoring systems and methods address this issue

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