Base Isolation Building Response to Subwayinduced Vibration and Its Analysis

Abstract:

Vibration was measured on the buildings with the installed isolation bearings in the vicinity of subway,the records of timehistory vibration at foundation and basement were obtained .In the time domain,the changes of acceleration timehistory were analyzed after isolation,the general effect of isolation was obtained.After calculating the corresponding Fourier spectrum and one third octave band frequency spectrum,the changes of vibration were obtained in various frequency bands after the isolation.Then the effect of base isolation on the transmission of subwayinduced vibration was discussed.Results show that the main components of subwayinduced vibration are in the frequency domain from 45 to 75 Hz.The isolation effects of isolation device are notable in horizontal direction of subwayinduced vibration,but things are different in the vertical direction.

Key words:subwayinduced vibration; site measurement; time history of vibration acceleration; Fourier spectrum; vibration level