Generalized displacement hybrid monitoring damaged cable load progressive identification method

Abstract

Disclosed is a generalized displacement hybrid monitoring damaged cable load progressive identification method. The method comprises the steps that on the basis of hybrid monitoring, whether a mechanical calculation reference model of a cable structure needs to be updated or not is determined by monitoring support generalized replacement, the temperature of the cable structure, the environment temperature, the load variation degree and the damaged degree of a damaged cable; a new mechanical calculation reference model, including the support generalized displacement, the load variation degree, the damaged degree of the damaged cable and the temperature, of the cable structure is obtained; on the basis of the model, according to the approximate linear relation between a current numerical vector of a monitored amount and a current initial numerical vector of the monitored amount, the approximate linear relation between the current numerical vector of the monitored amount and a unit damage monitored amount numerical variation matrix, and the approximate linear relation between the current numerical vector of the monitored amount and a current nominal damage vector to be solved, when the support generalized displacement and temperature variation exist, the influence of an interference factor can be removed, and the damaged cable and the load variable quantity can be accurately identified.

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 the sake of convenience, this method expresses this type of structure as The rods under tension or axial compression loads (also known as two-force rods) are collectively referred to as "cable systems" for convenience, and the term "supporting cables" is used in this method to refer to bearing cables, bearing cables and A member that bears axial tension or axial compression load is sometimes referred to as a "cable", so when the word "cable" is used later, it actually refers to a two-force member for a truss structure. During the service process of the structure, the correct identification of the health state of the supporting cables or the cable system i...

AI Technical Summary

Problems solved by technology

[0005] When the support has a generalized displacement, some of the currently disclosed technologies and methods can only identify the change of the structure's load when all other conditions remain unchanged (only the load on the structure changes), and some can only identify the change in all other conditions. Recognizes changes in structural health all other things being equal (only structural temperature and structural health change) Recognizes structural (ambient) temperature and structure Changes in the health state, there is currently no public and effective method that can simultaneously identify changes in the structural load, structural (environment) temperature, and structural health state, or in other words, the load on the structure and the structural (environment) temperature at the same time When changing, there is no effective method to identify changes in the structural health status, and the load on the structure and the structure (environment) temperature often change, so how to eliminate the load when the load on the structure and the structure (environment) temperature change Changes and structural temperature changes on the health status identification results of cable structures, so as to accurately identify the changes in the health status of the structure, is an urgent problem to be solved at present. This method discloses a method. When the support has a generalized displacement, When the load on the cable structure and the structure (environment) temperature change, the influence of the generalized displacement of the support, load change and structure temperature change on the identification results of the cable structure health status can be eliminated, and the damaged cable can be identified based on the monitoring of the monitored quantity. It is of great value to the safety of the cable structure

[0006] Similarly, in the currently disclosed methods, there is no method that can eliminate the influence of the generalized displacement of the support, the temperature change of the structure, and the health status of the support cable, so as to realize the correct identification of the load change degree. For the structure, the load change It is also very important to identify

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