Problematic cable/concentrated load progressive recognition method on basis of linear displacement cable power monitoring

Abstract

The invention relates to a problematic cable / concentrated load progressive recognition method on the basis of linear displacement cable power monitoring, which is based on cable power monitoring. Bracket linear 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 linear 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 linear 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 load is sometimes referred to as "cable" for short, so when the word "cable" is used later, it actually refers to a two-for...

AI Technical Summary

Problems solved by technology

[0005] When the support has a linear 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 of the load on the structure under all other conditions. Recognizes changes in structural health when constant (only structural health changes) and some only recognizes structural (environmental) temperature and structural health while all other things are constant (only structural temperature and structural health change) State changes, there is currently no public and effective method that can simultaneously identify changes in structural load, structural (environment) temperature, and structural health status, or in other words, when the load on a structure and the structural (environment) temperature change simultaneously At that time, there is no effective method to identify the change of the structural health state, and the load on the structure and the structure (environment) temperature often change, so how to eliminate the load change when the load on the structure and the structure (environment) temperature change and the impact of structural temperature changes on the identification results of the health state of the cable structure, so as to accurately identify the change of the health state of the structure is an urgent problem to be solved at present. This method discloses a method that can be used in When the concentrated load on the cable structure and the structural (environmental) temperature change, the influence of the support line displacement, load change and structural temperature change on the identification results of the cable structure health status is eliminated, and the problematic cable is identified based on the monitoring of the monitored quantity. The safety of structures is of great value

[0006] Similarly, in the currently disclosed methods, there has not been a method that can eliminate the influence of support line displacement, structural temperature change, and support cable health status, so as to realize the correct identification of the degree of concentrated load change. For structures, the load It is also very important to identify changes

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