Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Seismic Analysis of Ground for Seismic Risk Assessment of Architectural Heritage in Seoul

건축문화재 지진 위험도 평가를 위한 지반의 내진해석 : 서울지역을 중심으로

  • Han, Jung-Geun (School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang Univ.) ;
  • Keon, Seong-Kon (Dept. of Civil Engineering, Yeoju Institute of Technology) ;
  • Hong, Kikwon (School of Civil and Environmental Engineering, Urban Design and Study, Chung-Ang Univ.)
  • Received : 2013.11.21
  • Accepted : 2013.12.09
  • Published : 2013.12.30
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Abstract

This paper describes the earthquake risk evaluation of 15 sites of architectural heritages, which are considered ground conditions of sites in Seoul. In order to acquire the input data of earthquake response analysis, surface wave exploration was performed at the site. Earthquake response analysis and 3D earthquake safety evaluation were carried out under the base of scenario earthquakes. Ground displacements of areas, which are located on architectural heritages, are showed about 0.5 mm ~ 9.7 mm, and it was analyzed to small affected by earthquakes. In case of Naksungdae three-story stone pagoda, ground displacement is similar to the others. However, displacement of three-story stone pagoda with granite is 30 mm on the top, because the greatest occurrence of that is caused by stress release at seismic wave effect.

본 연구에서는 시울지역 내 분포하고 있는 15개 지역의 문화재 주변지반에 대하여 표면파탐사를 바탕으로 하는 지반조사결과를 이용하여 수치해석 기반의 3차원 내진해석을 수행하였으며, 해석결과를 기반으로 지반변위를 분석하였다. 해석결과, 지반의 변위는 (구)공업전습소 본관이 최대 약 9.7mm로 나타났다. 이와 같이 변위가 작게 나타난 원인은 문화재가 위치한 지역의 토층이 매우 단단하기 때문으로 표면파 탐사를 통해서 분석된 지반가속도를 비교해 보아도 하부에 매우 단단한 암층이 존재하는 것으로 확인되었다. 그러나 낙성대 삼층석탑에 있어서, 지반 자체의 변위는 다른 지역과 유사하게 나타났으나 화강암으로 구성된 석탑은 상부에서 최대 30mm의 변위를 나타냈다. 이는 낙성대 삼층석탑을 지지지하는 지반의 경우 지진파에 대한 상호 보완을 할 수 있는 구조, 즉 지반반력으로 인한 감쇠효과가 나타나기 때문에 지반의 변위 자체는 작게 해석되었으나 상부 구조물의 경우에는 지진파가 작용하였을 때 응력해방에 기인하여 변위가 가장 많이 발생한 것으로 판단된다.

Keywords

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