Study on the Train-Induced Vibration Transmission Within the Over-Track Building

The integrated complexes, known as the over-track building and metro depot complexes, have been widely developed in recent years in China. The construction of the over-track buildings has great merits of reductions in occupying urban land, conveniences in commuting to work, and comprehensive exploitation of the upper spaces. Such complexes have some negative effects that the train operation into and out of the depots can induce structural vibrations causing discomfort on occupants inside the buildings. To characterize the vibration transmissions between the floors, the three-dimensional dynamic finite element model of soil-platform-building has been established. The coupled train–track model was studied and applied as well in this paper. Diverse analyses of vibration responses have been conducted including vibration acceleration levels and vibration acceleration spectra in frequency domain and in 1/3 octave frequency. It found that vibration transmission law across floors in the horizontal orientation inside the over-track building absolutely differs from that in the vertical orientation. Train-induced vibrations inside the over-track building are mainly distributed in high frequency within 30–80 Hz, which have potential to make impacts on the occupants. Dynamic responses have revealed the key insights into the vibration transmissions in different orientations inside the over-track buildings.