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Analysis of Steel Reinforcement Ratio for Bent Pile Structures Considering Column-Pile Interaction

기둥-말뚝의 상호작용을 고려한 단일 현장타설말뚝의 철근비 분석

  • Kim, Jae-Young (School of Civil and Environmental Engineering, Yonsei University) ;
  • Jeong, Sang-Seom (School of Civil and Environmental Engineering, Yonsei University) ;
  • Kim, Jang-Ho Jay (School of Civil and Environmental Engineering, Yonsei University)
  • 김재영 (연세대학교 사회환경시스템공학부) ;
  • 정상섬 (연세대학교 사회환경시스템공학부) ;
  • 김장호 (연세대학교 사회환경시스템공학부)
  • Received : 2013.10.08
  • Accepted : 2014.01.03
  • Published : 2014.04.30

Abstract

In this study, an interactive analysis considering column-pile interaction is performed on the basis of an equivalent base spring model for supplementing virtual fixed point design of bent pile structures. Through this analytical method, the application of the minimum steel reinforcement ratio of the pile (0.4%) is analyzed by taking into account the major influencing parameters. Furthermore, the limit depth for steel reinforcement ratio is proposed through the relationships between column and pile conditions. To obtain the detailed information, it is found that an interactive analysis is intermediate in theoretical accuracy between the virtual fixed point model analysis and full-modeling analysis. Base on this study, it is also found that the maximum bending moment is located within cracking moment of the pile when material nonlinearity is considered. Therefore, the minimum steel reinforcement ratio is appropriately applicable for the optimal design of bent pile structures. Finally, the limit depth for steel reinforcement ratio ($L_{As=x%}$) is proposed by considering the field measured results. It is shown that the normalized limit depth ratio for steel reinforcement ratio ($L_{As=x%}/L_P$) decreases linearly as the length-diameter ratio of pile ($L_P/D_P$) increases, and then converges at a constant value.

Acknowledgement

Supported by : 한국연구재단

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