Damaged cable concentrated load recognition method based on hybrid monitoring in process of linear displacement

Abstract

A damaged cable concentrated load recognition method in the process of a linear displacement is based on hybrid monitoring. The method comprises the steps of monitoring the support linear displacement, cable structure temperature and environmental temperature to determine whether a mechanical calculation benchmark model for a cable structure needs to be updated, obtaining the mechanical calculation benchmark model of the cable structure, wherein the support linear displacement, the cable structure temperature and the environmental temperature are considered, and calculating to obtain a unit damage monitored amount numerical change matrix based on the mechanical calculation benchmark model. A non-inferior solution of the current nominal damage vector of an evaluated object is figured out according to the approximate linear relationship between the monitored amount current value vector and the monitored amount current initial value vector and according to the approximate linear relationship between the unit damage monitored amount numerical change matrix and the current nominal damage vector of the evaluated object to be solved. In this way, when the support linear displacement and the temperature are changed, the influence caused by interference factors can be eliminated, and the variable quantity of concentrated loads and the damaged cables are 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

[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 damaged cable is identified based on the monitoring of the monitored quantity. The safety of the cable structure 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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