A rapid test and evaluation method for bridges based on the time-varying dynamic characteristics of the vehicle-bridge coupling system

Abstract

The invention discloses a bridge rapid test and evaluation method based on the change of time-varying dynamic characteristics of the vehicle-bridge coupling system. The decomposition method identifies the time-varying dynamic characteristic parameters of the vehicle-bridge coupling system, and then substitutes them into the mapping relationship between the mode-shape scaling coefficient and the vehicle parameters and time-varying dynamic characteristics, and then the mode-shape scaling coefficient and displacement flexibility of the structure can be calculated. The deep-level parameters of the degree matrix can be used to predict the deformation of the structure under any static load and to identify structural damage based on the displacement flexibility matrix. The method of the present invention has the advantage of identifying deep-level parameters of the structure from the only output vibration response, and then realizes the structural performance evaluation, and has the characteristics of low test cost, short test time and high recognition accuracy, and is widely used in national highway networks. Broad prospects for numerous bridge safety assessments.

Description

technical field [0001] The invention belongs to the technical field of structural health monitoring, in particular to a bridge rapid test and evaluation method based on time-varying dynamic characteristic changes of a vehicle-bridge coupling system. Background technique [0002] Environmental vibration testing is a major means of structural health monitoring, but it can only obtain the basic modal parameters of the structure, and cannot effectively support the safety performance evaluation of the structure. In order to overcome this problem, foreign scholars have proposed an identification method of mode shape scaling coefficient based on mass change. For dynamic parameters, the relationship between the scaling coefficient of the structural mode shape and the basic mode parameters of the structure in the two states is derived through formula derivation, so that the mass-normalized mode shape of the structure can be identified from the only output environmental vibration test...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: Aiming at the above existing problems in the prior art, the present invention proposes a rapid bridge test and evaluation method based on the time-varying dynamic characteristics of the vehicle-bridge coupling system. The shortcomings of hierarchical parameters break through the difficult problem of shock vibration on-site testing. Not only can the static deformation of the structure be obtained, but also the stiffness information of the structure can be obtained, so as to evaluate the safety state of the bridge structure more effectively.

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