Novel method for recognizing rigidity between shearing type structure layers under environmental excitation

Abstract

The invention relates to a novel method for recognizing the rigidity between shearing type structure layers under environmental excitation. Firstly, the free vibration response of a structure is replaced by a cross correlation function of the structure acceleration response under environmental excitation by using a natural excitation technology; then an equation is decoupled by using the free vibration of the shearing type structure, and a vibration equation of the multidegree of freedom shearing type structure represented by the cross correlation function of the acceleration response is decomposed into a forced vibration equation of a plurality of single degree of freedom systems under the action of corresponding virtual dynamic loads; and finally the physical parameter recognition is carried out on each single degree of freedom system under the action of virtual dynamic loads by using the extended kalman filter algorithm to obtain a recognition value of the rigidity between the shearing type structure layers. The invention only needs to collect the vibration response of each shearing type structure layer, can recognize the rigidity between the layers relatively and accurately, has better prospect of engineering application, can be used for safety detection and health monitoring of a building with a mechanical model, such as, a rigid frame, a frame, and the like being simplified into a shearing type model.

Description

technical field [0001] The invention belongs to the field of identification of physical parameters of structures, and in particular relates to a new method for identification of interlayer stiffness of shear-type structures under environmental excitation conditions, which is mainly applied to the construction of buildings whose mechanical models such as rigid frames and frames can be simplified to shear-type models. Safety detection and health monitoring. Background technique [0002] Physical parameter identification is one of the core issues of structural inspection and health monitoring research. According to the change of physical parameters (especially stiffness), it is possible to directly determine whether the structure is damaged and the location and degree of damage. In the actual engineering of structural health monitoring, the available excitation methods are often limited to environmental excitation. Under such excitation conditions that are difficult to observe,...

AI Technical Summary

Problems solved by technology

However, engineering structures in reality are often large-scale, and it is almost impossible to achieve artificial excitation, so it is a promising method to use the structural response under environmental excitation (such as ground pulse, traffic load, wind load, etc.) for parameter identification. But environmental stimuli are generally not repeatable and difficult to measure

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