Experimental investigation on train-induced vibrations of a semi-closed noise barrier on the urban viaduct

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (16) : 14-21.

XIE Weiping1,YU Huabin1,SUN Liangming1,HU Zhe2，ZHAO Hanbing1

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Abstract

In order to investigate the vibration responses and its propagation law of a semi-closed noise barrier on the urban viaduct when a subway train is slowly passing through, field measurements are performed for the semi-closed noise barrier on the viaduct of a certain urban rail transit.Based on the measured data, the dynamic characteristic and vibration response of the semi-closed noise barrier on the viaduct as well as the excitation characteristic of subway train were analyzed.Finally, the influence of train speed for the train-induced vibrations was also been discussed.The results show that the amplitudes of predominant components of train loads excited by slowly passing train fluctuate in accordance with the moving of train bogies.The vertical, lateral, and longitudinal acceleration responses on the top of H-shaped steel column approach to each other while the longitudinal one is slightly greater, but they are all more prominent than the responses of track slab.It is shown that the vibration response of acrylic board is usually severer than that of H-shaped steel column especially in the lateral direction.In addition, the vibration acceleration level differences of the structure between different train speeds are generally lower than 5 dB when the subway train is travelling at the operation speed.And the speed of train mainly affects the amplitude of vibration component excited by the periodic loading of wheelsets in the frequency domain.

Key words

viaduct / semi-closed noise barrier / train-induced vibration / field measurement

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XIE Weiping1,YU Huabin1,SUN Liangming1,HU Zhe2，ZHAO Hanbing1. Experimental investigation on train-induced vibrations of a semi-closed noise barrier on the urban viaduct[J]. Journal of Vibration and Shock, 2019, 38(16): 14-21

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