Linear displacement progressive type identification method for strain monitoring of damaged cable and intensive load

Abstract

The invention provides a linear displacement progressive type identification method for strain monitoring of a damaged cable and an intensive load. According to the linear displacement progressive type identification method, whether a mechanical calculation reference model of a cable structure needs to be updated or not is determined based on the strain monitoring through monitoring support linear displacement, a temperature of the cable structure, an environment temperature, an integrated load change degree and a damage degree of the damaged cable to obtain a new mechanical calculation reference model of the cable structure, which includes the support linear displacement, the integrated load change degree, the damage degree of the damaged cable and the temperature; when the support linear displacement and the temperature are changed, influences of interference factors are eliminated based on the model according to a similar linear relation of a current numerical value vector of a monitored amount, a current initial numerical value vector of the monitored amount, a monitored amount numerical value change matrix of a unit damage and a current nominal damage vector to be solved, and the change amounts of the damaged cable and the intensive load are identified accurately.

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...

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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 loa

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