Damaged cable and supporting seat translation progressive-type identification method based on space coordinate monitoring at moment of temperature variation

Abstract

The invention relates to a damaged cable and supporting seat translation progressive-type identification method based on the space coordinate monitoring at the 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 translation displacement of a supporting seat and monitoring the temperature of the cable structure, the ambient temperature and the damage degree of the damaged cable, a novel mechanical calculation benchmark model considering the translation displacement of the supporting seat, the damage degree of the damaged cable and the temperature of the cable structure is obtained, and then the damaged cable and the translation displacement of the supporting seat are accurately identified on the basis of the model according to an approximate linear relation between the moment numerical value vector of a monitored parameter and the moment initial numerical value vector of the monitored parameter and between a unit damage monitored parameter numerical value unit variation matrix and a moment nominal damage vector to be solved 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, 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 state of the cable system and the translational displacement of the support, the monitored quantity will also be affected by the temperature change of the cable structure (which often occurs). Under the condition that the temperature of the cable structure changes, if the monitored quantity can It is of great value to the safety of the cable structure to realize the identification of the translational displacement of the support cable and the support with health problems. At present, there is no public and effective health monitoring system and method to solve this problem.

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