The Seismic Performance of Mountain Isolated Building Frame Structure under Near-fault Ground Motions

YANG You-fa; LIU Yong-iing; LING Ling

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Journal of Railway Engineering Society ›› 2014, Vol. 31 ›› Issue (5) : 6-11.

The Seismic Performance of Mountain Isolated Building Frame Structure under Near-fault Ground Motions

YANG You-fa 1，LIU Yong-iing2，LING Ling2

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Abstract

Research purposes:The distinct long-duration pulse motion of ground velocity in the near-fault region may cause the adverse influence on the seismic performance of the base isolation building. In China, mountainous region account for more than two-thirds of the total geographical area. It’s especially important to study the seismic performance of the mountainous isolated structures on complex terrain. Different characteristics of near-fault ground motions from Taiwan Chi-Chi earthquake is chosen，and spectrum analysis is carried out on. It includes the influence on seism response of SSI multilayer mountain groundbase isolation building of hanging-wall，speed pulse，rupture directivity and fling-step effect.

Research conclusions:(1)The seism response of SSI multilayer ground base isolation building is found different，which is much greater under hanging-wall than footwall ground motions if the PGA of earthquake is not scaled，but the result is the other way around if the PGA is scaled at 400 gal. (2)It is also found that under the ground motions with rupture forward directivity the seism responses is the greater followed by ground motion with fling-step，and the ground motions without pulses is the smallest.(3)The normal component of fault is greater than the parallel under which the seism response of SSI multilayer groundbase isolation building. (4)This paper provides the seismic response rules of mountain isolated building frame structure to near-fault ground motions，and also provides valuable reference to seismic design of mountain isolated building.

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soil-structure interaction ( SSI) / near fault ground motion / multilayer groundbase / base isolation

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YANG You-fa, LIU Yong-iing, LING Ling. The Seismic Performance of Mountain Isolated Building Frame Structure under Near-fault Ground Motions[J]. Journal of Railway Engineering Society, 2014, 31(5): 6-11

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