An experimental study on the vibration propagation of high-speed railway integrated transportation hub station structure

Abstract

<p indent="0mm">In order to better understand the very complicated vibration characteristics of an integrated transportation hub station where vibrations are often excited by the high-speed trains entering and exiting at a much lower speed, a large-scale field measurement was carried out in the waiting hall of the Nanchang West Railway Station. Four kinds of measuring points are set up in the waiting hall to study the propagation characteristics of the vibration caused by high-speed railway in and out of the train at low speed in the time-domain and frequency-domain. At the same time, the propagation characteristics of the vibration caused by the high-speed railway in the vertical and along-rail directions of the waiting hall are studied. The influence of different structural positions such as expansion joints on the propagation characteristics of vibration is also studied. The results show that vibration propagation can be greatly influenced by the used beam-column structure. The restraint provided by such structure can effectively suppress the vibration above <sc>40 Hz,</sc> with the largest vibration response found at the center of the large-span plate sitting on top. The vibration response at the edge of expansion joint increases significantly. Therefore, vibration mitigation measures should be considered at those positions. The bridge separation structure of the integrated transportation hub station can effectively block the propagation of high-frequency vibrations above <sc>40 Hz.</sc> But for vibrations lower than <sc>40 Hz,</sc> the effect is very limited as they can still transmit through the separation via the structure-soil-structure path. In general, the comprehensive vertical vibration response in the integrated transportation hub station is larger than that in the horizontal direction, which dominates, but from the frequency division frequency band, the horizontal vibration is larger than the vertical vibration in the low frequency band lower than <sc>5 Hz</sc>. At the same time, the horizontal vibration propagation attenuation is not obviously affected by the constraint of structure beam-column.