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2017 Vol.33, Issue 6
Evaluation of Rocking Behaviors During Earthquake for the Shallow Foundation System on the Weathered Soil Using Dynamic Centrifuge Test

동적 원심모형실험을 이용한 풍화토 지반에 놓인 얕은기초 시스템의 지진 시 회전 거동 특성 평가

Jeong-Gon Ha1
,
Seong-Bae Jo2
,
Heon-Joon Park3
,
Dong-Soo Kim4*
하 정곤1
,
조 성배2
,
박 헌준3
,
김 동수4*
1Postdoctoral Researcher, Dept. of Civil and Environmental Engrg., KAIST
2Researcher, Infrastructure Research Center, K-water Institute
3Research Prof., Dept. of Civil and Environmental Engrg., KAIST
4Prof., Dept. of Civil and Environmental Engrg., KAIST
1한국과학기술원 건설 및 환경공학과 박사후연구원
2K-water 연구원 인프라안전연구소 연구원
3한국과학기술원 건설 및 환경공학과 연구교수
4한국과학기술원 건설 및 환경공학과 교수
*교신저자. *Corresponding Author. 
30 June 2017. pp. 5-16
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Abstract

Rocking behavior of shallow foundation during the earthquake can reduce the seismic load of the superstructure. The dynamic centrifuge tests were performed to investigate the availability of using rocking behavior for the weathered soil condition. The centrifuge test model was composed of the weathered soil, shallow foundation and single degree of freedom structure. And the accelerations of soil, foundation and structure, and the foundation settlement were measured during the earthquake. From the test result, the seismic load of the structure for the strong earthquake input was reduced by the rocking behavior with foundation uplift and the maximum foundation settlement was less than 0.5% of the foundation width. This shows the potential that the rocking foundation concept can be used in the economical seismic design of foundation for the weathered soil in the future with additional research and verification.

Keywords
Seismic load
Centrifuge test
Rocking Foundation
Shallow Foundation
Weathered Soil

얕은기초의 회전거동은 지진 시 기초 위 상부 구조물의 지진 하중을 줄여주는 장점이 있어 새로운 기초 내진설계개념으로 대두되고 있다. 본 연구에서는 현장 채취한 시료를 다짐하여 조성된 풍화토 지반에서 얕은기초의 회전거동을 평가하기 위하여 동적 원심모형실험을 수행하였다. 원심모형실험 모형은 풍화토 지반, 얕은기초, 단자유도 구조물로 이루어져 있으며, 지진 시 지반, 기초, 구조물의 가속도 응답과 기초의 침하 등 얕은기초 시스템의 거동을 관찰하였다. 입력 지진 하중이 클 경우 상부 구조물의 지진하중은 풍화토 지반에 놓인 기초 들뜸에 의한 회전거동으로 인해 줄어들었으며, 기초의 침하도 최대 기초폭의 0.5%이하로 작게 발현되었다. 이를 통하여 향후 추가적인 연구 및 검증을 바탕으로 국내 풍화토 지반에서 회전 거동 개념을 이용한 기초 설계 가능성을 확인하였다.

References
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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 33
  • No :6
  • Pages :5-16
  • Received Date : 2016-05-16
  • Accepted Date : 2017-06-14
  • DOI :https://doi.org/10.7843/kgs.2017.33.6.5
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