Numerical Analyses of O-Cell Load Test on Pile

양방향말뚝재하시험의 수치해석

  • Joo, Yong-Sun (Dept. of Civil, Architecture and Environmental System Engineering, Sungkyunkwan Univ.) ;
  • Kim, Nak-Kyoung (Dept. of Civil, Architecture and Environmental System Engineering, Sungkyunkwan Univ.) ;
  • Kim, Woong-Jin (Dept. of Civil, Architecture and Environmental System Engineering, Sungkyunkwan Univ.) ;
  • Park, Jong-Sik (Hanwha Research Institute of Technology)
  • 주용선 (성균관대학교 건설환경시스템공학과) ;
  • 김낙경 (성균관대학교 건설환경시스템공학과) ;
  • 김웅진 (성균관대학교 건설환경시스템공학과) ;
  • 박종식 (한화건설 한화기술연구소)
  • Published : 2008.10.10

Abstract

Bi-directional load test is one of O-cell tests. The O-cell test is a system which may be used for performing static load tests on cast in situ reinforced concrete bored piles. The technique was devised and developed by Osterberg of Northwestern University(USA) and has been in use around the world. The principle of the method is that an O-cell is installed in a cast in situ bored pile base. Once the pile concrete reaches its design strength the cell is connected to an hydraulic pump and pressured. Pressurisation causes the cell to expand, developing an upward force on the section of pile above the cell loads, pile movements and strains within the pile then enable the capacity of the pile and its load settlement curves to be ascertained. Bi-directional load tests using O-cell are now becoming common practice around the world, particularly where the loads to be applied are high or where it is not convenient to perform top-down loading tests. In the study, calculate ultimate capacity of bi-directional load test using FEM and beam on elasto-plastic foundation theory.

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