Indirect Damage Identification of Simply-supported Bridges Based on Contact Point Residual Responses of a Two-axle Passing Vehicle
To indirectly identify bridge damage using the vibration responses of a regular two-axle passing vehicle,the components of driving frequencies of the residual contact-point response were processed to establish the instantaneous amplitude square(IAS)indicator.This indicator was employed to localize and quantify bridge damage solely based on its local change features.The closed-form solution for the residual contact-point acceleration of a two-axle vehicle passing through a simply beam was derived,and the IAS indicator was established using the com-ponents of driving frequencies.A finite element simulation program of the vehicle-bridge interaction system was established to validate the theoretical derivation of the IAS indicator and its ability to detect damage.The results indicate that the residual contact-point response can completely eliminate the influence of vehicle vibration and road roughness,and is effective to detect damage when the coupling effect between the vehicle and the bridge can be ignored.The residual contact-point response can accurately identify multiple bridge frequencies even when consider-ing road roughness.The constructed IAS indicator can accurately identify single or multiple points of damage.
万方数据
维普
