Damaged cable approximation identification method based on spatial coordinate monitoring of bearing settlement temperature change

Abstract

The invention relates to a damaged cable approximant identification method on the basis of the space coordinate monitoring during support settlement and temperature variation. According to the damaged cable approximant identification method, on the basis of the space coordinate monitoring, the translation displacement of a support, the temperatures of cable structures, the environment temperature and the damage degrees of damaged cables are monitored to determine whether a mechanical calculation reference model of the cable structures needs to be updated so as to obtain a novel mechanical calculation reference model of the cable structures, in which the translation displacement of the support and the temperatures of the cable structures are counted; and on the basis of the new model, according to approximate linear relations between a current value vector of a monitored quantity and a current initial value vector of the monitored quantity, a value change matrix of the unit damage monitored quantity and a current nominal damage vector to be obtained, when the support has the translation displacement and the temperature is changed, the positions and the damage degrees of the damaged cables can be accurately determined.

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...

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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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