Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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A preliminary numerical analysis study on the seismic stability of a building and underground structure by using SSI

SSI를 이용한 건물과 인접지하구조물의 내진 안정성에 대한 기초 수치해석 연구

  • You, Kwang-Ho (School of Civil Environment Energy Engineering, University of Suwon) ;
  • Kim, Young-Jin (School of Civil Environment Energy Engineering, University of Suwon)
  • 유광호 (수원대학교 건설환경에너지공학부) ;
  • 김영진 (수원대학교 건설환경에너지공학부)
  • Received : 2017.11.23
  • Accepted : 2017.12.26
  • Published : 2018.01.31
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Abstract

Up to now, most of studies on seismic analysis have been limited to analyze buildings and underground structures individually so that the interaction between them could not be analyzed effectively. Thus, in this study, a dynamic analysis was conducted for soil-structure interaction with a complex underground facility composed of a building and an adjacent underground structure constructed on a surface soil and the bed rock ground conditions. Seismic stability was analyzed based on interstory drift ratio and bending stress of structure members. As a result, an underground structure has more effect on a high-rise building than a low-rise building. However the above structures were proved to be favorable for seismic stability. On the other hand, tensile bending stresses exceeded the allowable value at the underground part of the building and the adjacent underground structure so that it turned out that the underground part could be weaker than the above part. Therefore, it is inferred that above and underground structures should be analyzed simultaneously for better prediction of their interaction behavior during seismic analyses because there exist various structures around buildings in big cities.

현재까지 대부분의 내진해석 연구는 지상과 지하구조물을 개별적으로 분석하는 데 제한되어왔기 때문에 그 상호거동이 효과적으로 분석되지 못했다. 따라서 본 연구에서는 기반암과 표층으로 이루어진 지반에 건물과 인접지하구조물이 설치되는 복합지하시설물을 대상으로 지반과 구조물을 동시에 고려한 동적해석(SSI)을 수행하였다. 내진안정성이 층간변위비와 구조부재의 휨응력에 근거하여 분석되었다. 그 결과, 초고층건물이 저층건물보다 인접지하구조물의 영향을 더 많이 받지만, 지상구조물은 내진안정성이 양호한 것으로 나타났다. 반면, 건물의 지하부와 인접지하구조물에서 발생한 휨인장응력이 허용값을 초과하여 지상부보다는 지하구조물이 더 취약할 수 있다고 나타났다. 따라서 대도시에서의 건물은 주변에 다양한 구조물이 존재하기 때문에 내진해석 시 지상 및 지하구조물을 동시에 고려해야 상호거동을 정확히 예측할 수 있다고 판단된다.

Keywords

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