Problematic cable/concentrated load/angular displacement progressive recognition method on basis of strain monitoring

Abstract

The invention relates to a problematic cable / concentrated load / angular displacement progressive recognition method on the basis of strain monitoring, which is based on strain monitoring. 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 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 recognizing the bracket angular displacement, concentrated load variation and problematic cable in the presence of 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 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. The damage and slack of supporting cables is a major threat to the safety of cable structures. In this method, damaged cables and slack ca...

AI Technical Summary

Problems solved by technology

[0005] Among the currently disclosed technologies and methods, some can only identify the change of the load on the structure when all other conditions remain unchanged (only the load on the structure changes), and some can only identify changes in the load on the structure when all other conditions remain unchanged (only the structure Changes in health status) to identify changes in structural health status, some are only able to identify changes in structural (environment) temperature and structural health status when all other conditions remain unchanged (only structural temperature and structural health status change), currently there is no A public and effective method can simultaneously identify changes in structural loads, structural (environment) temperature, and structural health, or when the structure's loads and structural (environment) temperature change simultaneously, there is no effective method It is possible to identify changes in the health state of structures, and the loads and structural (environmental) temperatures on structures often change, so how to eliminate the impact of load changes and structural temperature changes on cable structures when the loads on structures and structural (environmental) temperature changes The influence of the health state identification results, 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 withstand the concentrated load of the cable structure when the support has angular displacement When the temperature and structure (environment) change, it is important for the safety of the cable structure to eliminate the influence of the angular displacement of the support, the change of the load and the change of the structure temperature on the identification results of the health state of the cable structure, and to identify the problem cable based on the monitoring of the monitored quantity. value

[0006] Similarly, in the currently disclosed methods, there has not been a method that can eliminate the influence of support angular 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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