Rapid bridge testing and estimation method based on change of time-varying dynamic characteristics of axle coupling system

Abstract

The invention discloses a rapid bridge testing and estimation method based on change of time-varying dynamic characteristics of an axle coupling system. The rapid bridge testing and estimation methodcomprises the steps that vibration response of a structure under a moving vehicle is collected through a sensor arranged on a bridge, time-varying dynamic characteristic parameters of the axle coupling system are identified through a variational modal decomposition method and then substituted into a mapping relation among a vibration mode scaling factor, vehicle parameters and the time-varying dynamic characteristics, thus the vibration mode scaling factor and displacement flexibility matrix deep parameters of the structure can be calculated, accordingly, deformation of the structure at any static load is predicted, and structure damage identification based on a displacement flexibility matrix is conducted. The rapid bridge testing and estimation method has the advantage that the deep parameters of the structure are identified from only-output vibration response, and then structure performance is estimated, has the characteristics of low required test cost, short testing time and highidentification precision, and has wide prospects of being widely applied to safety estimation of multiple bridges on a national highway network.

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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