• 한국터널지하공간학회 논문집
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• 제20권5호
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• pp.757-772
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• 2018

최근 경주 포항 등 대도시에서 지진이 발생하고 이에 각 분야에서의 내진해석 연구가 활발히 진행되고 있다. 하지만 대부분의 기존 내진해석은 지상구조물과 지반을 따로 다루었기 때문에 지반과 구조물의 완전한 상호 동적거동에 대한 연구가 부족한 실정이다. 따라서 본 연구에서는 건물만 고려하는 지하구조물 고정단 모델과 건물과 지반을 함께 고려하는 연속체 모델을 각각 적용하기 위해 MIDAS GEN 및 MIDAS GTS NX를 이용하여 민감도 분석을 수행하고 SSI를 고려한 동적해석의 타당성을 살펴보았다. 연구 결과, 대부분의 조건에서 지하구조물 고정단 모델이 연속체 모델보다 초고층 건물의 최대 순수 수평변위를 더 작게, 휨응력을 더 크게, 또한, 취약부의 범위는 더 작게 산출하는 것으로 나타났다. 따라서 내진해석 시 지반-구조물 상호작용을 고려한 연속체 모델을 사용하는 것이 보다 타당할 것으로 판단된다.

• Geomechanics and Engineering
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• 제36권3호
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• pp.303-316
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• 2024

Seismic records are composed of mainshock and a series of aftershocks which often result in the incremental damage to underground structures and bring great challenges to the rescue of post-disaster and the repair of post-earthquake. In this paper, the repetition method was used to construct the mainshock-aftershocks sequence which was used as the input ground motion for the analysis of dynamic time history. Based on the Daikai station, the two-dimensional finite element model of soil-station was established to explore the failure process of station under different seismic precautionary intensities, and the concept of incremental damage of station was introduced to quantitatively analyze the damage condition of structure under the action of mainshock and two aftershocks. An arc rubber bearing was proposed for the shock absorption. With the arc rubber bearing, the mode of the traditional column end connection was changed from "fixed connection" to "hinged joint", and the ductility of the structure was significantly improved. The results show that the damage condition of the subway station is closely related to the magnitude of the mainshock. When the magnitude of the mainshock is low, the incremental damage to the structure caused by the subsequent aftershocks is little. When the magnitude of the mainshock is high, the subsequent aftershocks will cause serious incremental damage to the structure, and may even lead to the collapse of the station. The arc rubber bearing can reduce the damage to the station. The results can offer a reference for the seismic design of subway stations under the action of mainshock-aftershocks.