Damaged cable and concentrated load recognition method based on cable force monitoring

Abstract

The invention provides a damaged cable and concentrated load recognition method based on cable force monitoring. By monitoring a cable structure temperature and an environment temperature, whether a mechanical calculation benchmark model of a cable structure needs to be updated or not is determined, the mechanical calculation benchmark model of the cable structure, including the cable structure temperature and the environment temperature is obtained, and a unit damage monitored amount value change matrix is obtained in a calculated mode on the basis of the model. According to the approximately linear relation between a monitored amount current value vector and a monitored amount current initial value vector and the approximately linear relation between unit damage monitored amount value change matrix and a to-be-obtained evaluated object current nominal damage vector, a non-inferior solution to the evaluated object current nominal damage vector is calculated; accordingly, when temperature changes exist, influences from interference factors are eliminated by means of the multi-objective optimization algorithm and other appropriate algorithms, and the concentrated load variable quantity and a damaged cable can be 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] 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 impact of health state identification results, so as to accurately identify the changes in 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 concentrated load borne by the cable structure and the structure (environment) temperature change When excluding the impact of load changes and structural temperature changes on the identification results of the health state of the cable structure, it is of great value to the safety of the cable structure to identify damaged cables based on the monitoring of the monitored quantity.

[0006] Similarly, in the currently disclosed methods, there is no method that can eliminate the influence of structural temperature changes and the health status of supporting cables, so as to realize the correct identification of the degree of concentrated load change. For structures, the identification of load changes is also very important. important

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