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2018 Vol.34, Issue 5 Preview Page

Research Article

Evaluation of Dynamic p-y Curves of Group Piles Using Centrifuge Model Tests

원심모형실험을 이용한 무리말뚝의 동적 p-y 곡선 산정

Bao Ngoc Nguyen1
,
Nghiem Xuan Tran2
,
Sung-Ryul Kim3*
Nguyen Bao Ngoc1
,
Tran Nghiem Xuan2
,
김 성렬3*
1Dept. of Civil Eng., Dong-A Univ.
2Dept. of Civil and Environmental Eng., Seoul National Univ.
3Member, Dept. of Civil and Environmental Eng., Seoul National Univ.
1비회원, 동아대학교 토목공학과
2비회원, 서울대학교 건설환경공학부
3정회원, 서울대학교 건설환경공학부
* 교신저자* Corresponding Author
31 May 2018. pp. 53-63
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Abstract

Dynamic soil-pile interaction is the main concern in the design of group piles under earthquake loadings. The lateral resistance of the pile group under dynamic loading becomes different from that of a single pile due to the group pile effect. However, this aspect has not yet been properly studied for the pile group under seismic loading condition. Thus, in this study the group pile effect was evaluated by performing a series of dynamic centrifuge tests on 3×3 group pile in dry loose sand. The multiplier coefficients for ultimate lateral resistance and subgrade reaction modulus were suggested to obtain the p-y curve of the group pile. The suggested coefficients were verified by performing the nonlinear dynamic analyses, which adopted Beam on Nonlinear Winkler Foundation model. The predicted behavior of the pile group showed the reasonable agreement compared with the results of the centrifuge tests under sinusoidal wave and artificial wave.

Keywords
Soil-pile interaction
p-y curve
Centrifuge test
Group pile
p-multiplier

무리말뚝의 내진설계를 수행할 때 지반-말뚝 동적상호작용을 고려하는 것이 중요하다. 특히, 동적하중을 받는 무리말뚝의 횡방향 저항력은 무리말뚝 효과에 의하여 단일말뚝과 비교하여 감소한다. 그러나, 지금까지 지진하중을 받는 무리말뚝의 동적 무리말뚝 효과를 제안한 연구는 매우 부족한 실정이다. 그러므로, 본 연구에서는 건조 모래지반에 설치된 3×3 무리말뚝에 대한 동적 원심모형실험을 수행하여 무리말뚝 효과를 산정하였다. 이 무리말뚝 효과는 동적 p-y 곡선에서 극한 횡방향 지반반력과 지반반력계수에 대한 보정계수(multiplier)를 적용하여 고려하였다. 그리고, 본 연구에서 얻어진 동적 p-y 곡선을 Beam on Nonlinear Winkler Foundation 모델을 이용한 비선형 동해석에 적용하여 그 적용성을 검증하였다. 그 결과, 본 연구에서 제안한 무리말뚝의 보정계수가 원심모형실험 결과를 잘 모사할 수 있는 것으로 나타났다.

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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 : 34
  • No :5
  • Pages :53-63
  • Received Date : 2018-03-28
  • Revised Date : 2018-05-16
  • Accepted Date : 2018-05-17
  • DOI :https://doi.org/10.7843/kgs.2018.34.5.53
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