Strain-monitoring damaged cable centralized load generalized displacement recognition method

Abstract

Disclosed is a strain-monitoring damaged cable centralized load generalized displacement recognition method. The strain-monitoring damaged cable centralized load generalized displacement recognition method is based on strain monitoring. Whether a mechanical calculation reference model of a cable structure needs updating or not is determined through monitored cable structure temperature and environment temperature, and the mechanical calculation reference model, where the cable structure temperature and the environment temperature are reckoned, of the cable structure is acquired. A unit damage monitored amount numerical value variation matrix is acquired on the basis of the model. The non-inferior solution of an evaluated object current name damage vector is worked out according to the approximate linear relation between a monitored amount current numeric vector and a monitored amount current initial numerical value vector, the unit damage monitored amount value variation matrix and the evaluated object current name damage vector to be worked out. Accordingly, when temperature changes, a support generalized displacement, centralized load variable quantity and a damaged cable can be recognized.

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

[0004] 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 concentrated load borne by the cable structure and the structural (environmental) temperature change, the impact of the generalized displacement of the support, load change and structural temperature change on the health status identification of the cable structure can be eliminated, and the damaged cable can be identified based on the monitoring of the monitored quantity. , which is of great value to the safety of the cable structure

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