Resonance responses of vehicle during a two-axle train passing through sequential equal-span bridges

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 237-242.

SHI Jin1, YAU Jongdar2, WANG Yingjie1

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Abstract

The vehicle resonance mechanism and conditions during a two-axle train passing through sequential equal-span bridges were derived analytically. Then, a simplified planar train-bridge dynamic analysis model and the numerical simulation method were employed to verify resonance conditions. A heavy haul railway system was taken as an example to study the effect laws of vehicle resonance on the vehicle-bridge system. The results showed that vehicle resonance phenomena are caused by the repetitive vibration frequency of sequential equal-span bridges being consistent with vehicle vibration frequency (train body nod or float frequency), for current heavy haul trains, the vehicle speed corresponding to the main resonance is often above the normal train operating speed, while that corresponding to the sub-resonance is within the train running speed range; when the vehicle has the float main resonance and the nod sub-resonance, its dynamic response and the wheel-rail force are amplified significantly; although the effect of vehicle resonance on bridge dynamic response is smaller than that of bridge resonance on vehicle dynamic response, for a short span railway bridge, the vehicle resonance can significantly intensify bridge dynamic response; when each vehicle of a train simultaneously reaches the resonant speed, the whole train resonance phenomenon occurs.

Key words

Heavy haul railway / Moving load / Resonant speed / Vehicle resonance / Train

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SHI Jin1, YAU Jongdar2, WANG Yingjie1. Resonance responses of vehicle during a two-axle train passing through sequential equal-span bridges[J]. Journal of Vibration and Shock, 2019, 38(5): 237-242

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