Problematic cable/concentrated load progressive recognition method on basis of generalized displacement angle monitoring

Abstract

The invention relates to a problematic cable / concentrated load progressive recognition method on the basis of generalized displacement angle monitoring, which is based on angle monitoring. Bracket generalized displacement, cable structure temperature and ambient temperature are monitored to determine whether a mechanical calculation reference model of the cable structure needs to be updated, thereby obtaining a mechanical calculation reference model of the cable structure counting in the bracket generalized displacement, cable structure temperature and ambient temperature; and the calculation is performed on the basis of the model to obtain unit-damage monitored quantity value change matrix. The noninferior solution of the evaluated object current nominal damage vector is calculated according to the near linear relationship among the monitored quantity current value, monitored quantity current initial value vector, unit-damage monitored quantity value change matrix and unknown evaluated object current nominal damage vector, thereby eliminating the influence of interference factors and recognizing the concentrated load variation and problematic cable in the presence of bracket generalized displacement and temperature change.

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 stay cables, main cables, slings, tie rods, etc. The common point of this type of structure is the cable , Cables or rods that only bear tensile loads are supporting components. For convenience, this method describes this type of structure as a "cable structure", and all load-bearing cables, load-bearing cables, and all bearing cables that only bear axial The rods subjected to tensile or axial compression loads (also called two-force rods) are collectively referred to as "cable systems" for convenience. In this method, the term "supporting cables" is used to refer to load-bearing cables, load-bearing cables and only The rod that bears axial tension or axial compression is sometimes referred to as "cable" for short, so when the word "cable" is used later, it actually refers to a two-force me...

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 concentrated load borne by the cable structure and the structural (environmental) temperature change, the influence of the generalized displacement of the support, load change and structural temperature change on the identification results of the cable structure's health status can be eliminated, and the problem 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 state of the support cable, so as to realize the correct identification of the change degree of the concentrated load. For the structure, the load It is also very important to identify changes

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