| 抄録（英）： |
Vibrations transmission by train/traffic on viaducts to nearby ground have drawn engineering attention from various reasons. This issue is termed paraseismic problem here. Focusing such vibration emission from a train viaduct pile foundation, the authors develop vibration reduction measures by installing the wave impediment barriers (WIB) around it. In the computer simulation, the direct time domain and the frequency domain 3-dimensional finite element methods are used with appropriately chosen transmitting boundaries for the missing exterior. For transient analysis, the loading is considered by impulsive function and by Ricker wave form to give dominant periodicity to it. For harmonic analysis, the driving frequency is fixed to frequencies of interest. From the case study a newly proposed X-shaped WIB proved superior to the horizontal block type WIB.
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