기반암의 전단파속도를 고려한 지진파의 통과시차가 건물의 지진거동에 미치는 영향
Wave Passage Effect on the Seismic Response of a Building considering Bedrock Shear Wave Velocity
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초록
Spatial variations of a seismic wave are mainly wave passage and wave scattering. Wave passage effect is produced by changedcharacteristics of exciting seismic input motions applied to the bedrock. Modified input motions travel horizontally with time differencesdetermined by apparent shear wave velocity of the bedrock. In this study, wave passage effect on the seismic response of astructure-soil system is investigated by modifying the finite element software of P3DASS (Pseudo 3-Dimensional Dynamic Analysis of aStructure-soil System) to apply inconsistent (time-delayed) seismic input motions along the soft soil–bedrock interface. Study resultsshow that foundation size affected on the seismic response of a structure excited with inconsistent input motions in the lower periodrange below 0.5 seconds, and seismic responses of a structure were decreased considerably in the lower period range around 0.05seconds due to the wave passage. Also, shear wave velocity of the bedrock affected on the seismic response of a structure in the lowerperiod range below 0.3 seconds, with significant reduction of the seismic response for smaller shear wave velocity of the bedrockreaching approximately 20% for an apparent shear wave velocity of 1000m/s at a period of 0.05 seconds. Finally, it is concluded thatwave passage effect reduces the seismic response of a structure in the lower period range when the bedrock under a soft soil is soft orthe bedrock is located very deeply, and wave passage is beneficial for the seismic design of a short period structure like a nuclearcontainer building or a stiff low-rise building.
Abstract
Spatial variations of a seismic wave are mainly wave passage and wave scattering. Wave passage effect is produced by changedcharacteristics of exciting seismic input motions applied to the bedrock. Modified input motions travel horizontally with time differencesdetermined by apparent shear wave velocity of the bedrock. In this study, wave passage effect on the seismic response of astructure-soil system is investigated by modifying the finite element software of P3DASS (Pseudo 3-Dimensional Dynamic Analysis of aStructure-soil System) to apply inconsistent (time-delayed) seismic input motions along the soft soil–bedrock interface. Study resultsshow that foundation size affected on the seismic response of a structure excited with inconsistent input motions in the lower periodrange below 0.5 seconds, and seismic responses of a structure were decreased considerably in the lower period range around 0.05seconds due to the wave passage. Also, shear wave velocity of the bedrock affected on the seismic response of a structure in the lowerperiod range below 0.3 seconds, with significant reduction of the seismic response for smaller shear wave velocity of the bedrockreaching approximately 20% for an apparent shear wave velocity of 1000m/s at a period of 0.05 seconds. Finally, it is concluded thatwave passage effect reduces the seismic response of a structure in the lower period range when the bedrock under a soft soil is soft orthe bedrock is located very deeply, and wave passage is beneficial for the seismic design of a short period structure like a nuclearcontainer building or a stiff low-rise building.
참고문헌 (13)
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