Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Application and Verification of Coupled Analysis of Piled Piers

교량 말뚝기초 해석기법의 적용성 분석

  • 원진오 (연세대학교 공과대학 토목공학과) ;
  • 정상섬 (연세대학교 공과대학 토목공학과)
  • Published : 2005.06.01
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Abstract

A coupled three-dimensional pile group analysis method (YSGroup) was developed considering nonlinear pile head stiffness matrices and compared with other analytical methods (elastic displacement method, Group 6.0 and FBPier 3.0). In this method, a pile cap was modelled by four-node flat shell element, a pier was modelled using 3 dimensional beam element, and individual piles were modelled as beam-column elements. Through the comparative studies on a piled pie. subjected to lateral loads in linear soil, it was found that present method (YSGroup), elastic displacement method and Group 6.0 gave similar results of lateral pile head displacement, but FBPier 3.0 was estimated to show somewhat larger displacements than those from the three methods. Displacements of superstructure (pier), including nonlinear soil behavior, could be estimated by present method (YSGroup) and FBPier 3.0 because these two methods modelled the superstructure directly by finite element techniques. It was found that pile groups in pinned pile head condition had a tendency to cause excessive rotation of the pile cap.

비선형 말뚝두부강성을 고려한 3차원 군말뚝기초 해석기법(YSGroup)을 개발하였으며 이를 기타 해석기법들(탄성 변위법, Croup 6.0, FBPier 3.0)과 비교${\cdot}$분석하였다. 본 해석기법은 말뚝캡을 평면쉘요소로, 교각은 3차원 보요소로, 그리고 개개 말뚝들은 보-기둥요소로 모델링 하였다. 교각 상단에 수평하중을 받는 $2\times2$배열 군말뚝기초에서 지반을 선형으로 가정한 경우를 대상으로 탄성변위법, Group 6.0, FBPier 3.0, 그리고 본 해석기법(YSGroup)을 이용하여 해석한 결과, 본 해석기법과 탄성변위법, Group 6.0은 서로 유사한 말뚝두부변위가 산정되었으나 FBPier 3.0는 다소 큰변위가 산정되었다. 지반의 비선형성이 고려된 상부구조물(교각)의 변위는 본 해석기법(YSGroup)과 FBPier 3.0을 통해 산정 가능하였는데, 이는 본 해석기법과 FBPier 3.0은 유한요소법을 이용하여 상부구조물을 직접 모델링하였기 때문이다. 말뚝두부조건이 힌지조건인 경우의 군말뚝은 말뚝캡의 과다한 회전이 발생할 가능성이 큼을 알 수 있었다.

Keywords

References

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