Method for identifying damaged cable, concentration load and support linear displacement through mixed monitoring

Abstract

The invention discloses a method for identifying a damaged cable, a concentration load and support linear displacement through mixed monitoring. The method is based on the mixed monitoring and comprises the following steps: judging whether it is required to update a mechanical calculation benchmark model of a cable structure by monitoring cable structure temperature and environment temperature; obtaining the mechanical calculation benchmark model of the cable structure, with the cable structure temperature and the environment temperature being taken into account; obtaining a unit damage monitored quantity value-variation matrix by calculation based on the mechanical calculation benchmark model; calculating the non-inferior solution of a current nominal damage vector of an evaluated object, according to the approximately linear relations between a current numeric vector of a monitored quantity and a current initial numeric vector of the monitored quantity, the unit damage monitored quantity value-variation matrix, and the to-be-solved current nominal damage vector of the evaluated object; and according to the non-inferior solution, identifying the support linear displacement, concentration load variance and the damaged cable during temperature variation.

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

[0004] 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 status, and the load on the structure and the structural (environmental) temperature are often changed, so how to eliminate the load change when the load on the structure and the structural (environmental) 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 when the support is wired. 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 damaged cable is identified based on the monitoring of the monitored quantity. The safety of the cable structure is of great value

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