Taking a three-span continuous box girder bridge as the research object,a bridge model and a vehicle model are established to form a vehicle-bridge coupled dynamic model,and the impact coeffi-cient of the bridge structure under the action of vehicle load is studied and analysed.The study shows that:the number of transverse lanes increases the impact coefficient of the bridge,the greater the longi-tudinal distance the smaller the impact coefficient of the bridge;the impact coefficient of the bridge in the braking state of the vehicle is significantly greater than the impact coefficient of the vehicle at con-stant speed,and when the vehicle brakes in the first half of the bridge mid-span,the power impact coe-fficient is greater than the second half of the span;the vehicle in the jump impact effect,the impact co-efficient of the bridge mid-span increases significantly,and in the mid-span jump when the vehicle The bridge power impact coefficient is the largest.
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