Spatial coordinate monitoring method for identifying generalized displacement of concentrated loads of damaged cables

Abstract

The invention discloses a hybrid monitoring method for progressively identifying generalized displacement of concentrated loads of problematic cables. The hybrid monitoring method is based on hybrid monitoring, and includes monitoring temperatures of cable structures and the ambient temperature to determine whether mechanical computation reference models of the cable structures need to be updated or not; acquiring the mechanical computation reference models of the cable structures; computing and acquiring change matrixes of numerical values of unit damage monitored quantities on the basis of the models. The temperatures of the cable structures and the ambient temperature are included in the mechanical computation reference models of the cable structures. The hybrid monitoring method has the advantages that non-inferior solution of current nominal damage vectors of estimated objects is computed according to approximation linear relations among vectors of current numerical values of monitored quantities and vectors of current initial numerical values of the monitored quantities and approximation linear relations among the change matrixes of the numerical values of the unit damage monitored quantities and the to-be-solved current nominal damage vectors of the estimated objects, and accordingly the generalized displacement of supports, change quantities of the concentrated loads and the problematic cables can be simultaneously identified when the temperatures 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. 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

[0004] When the support has a generalized 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 in all other conditions. Recognizes changes in structural health all other things being equal (only structural temperature and structural health change) Recognizes structural (ambient) temperature and structure Changes in the health state, there is currently no public and effective method that can simultaneously identify changes in the structural load, structural (environment) temperature, and structural health state, or in other words, the load on the structure and the structural (environment) temperature at the same time When changing, there is no effective method to identify changes in the structural health status, and the load on the structure and the structure (environment) temperature often change, so how to eliminate the load when the load on the structure and the structure (environment) temperature change Changes and structural temperature changes on the health status identification results of cable structures, so as to accurately identify the changes in the health status of the structure, is an urgent problem to be solved at present. This method discloses a method. When the support has a generalized displacement, When the concentrated load borne by the cable structure and the structural (environmental) temperature change, the impact of the generalized displacement of the support, load change and structural temperature change on the health status identification of the cable structure can be eliminated, and the damaged cable can be identified based on the monitoring of the monitored quantity. , which is of great value to the safety of the cable structure

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