An Experimental Study on the Second Order Behavior of Reinforced Concrete Columns under Biaxial Loading

2축 휨과 출력을 동시에 받는 철근콘크리트 기둥의 2계 거동에 대한 실험적 연구

  • 이수곤 (정회원, 전남대학교 건축공학과) ;
  • 김진근 (정회원, 한국과학기술원 토목공학과) ;
  • 이상순 (정회원, 한국과학기술원 토목공학과) ;
  • 김선영 (정회원, 전남대학교 대학원) ;
  • 소윤호 (정회원, 전남대학교 대학원)
  • Published : 1997.10.01

Abstract

Studies on the second-order analysis of reinforced concrete columns have been chiefly dealt with symmetric section under uniaxial loading. In practical situations, however, columns are subjected to biaxial loadings. Therefore, for more accurate prediction of the behavior of concrete columns under biaxial loading, the interaction between bending moments of major and minor axes should be considered. Recently Kim & Lee proposed a numerical method of predicting the behavior of concrete columns under biaxial loading. In this paper, to investigate the behavior of concrete columns under biaxial loading and verify the validity of proposed method, a series of test were carried out for sixteen tied reinforced columns with 100${\times}$100mm square and 200${\times}$100mm rectangular sections under various loading conditions. The length of columns was 1,300mm and the concrete strength was 28MPa. The boundary conditions at the both ends were hinged and end eccentricities were equal(400mm). Proposed numerical analyses applied to the test piece were performed to predict behavior of concrete columns with square and rectangular sections under various loading conditions. Test results were also compared with those using the moment magnifier method in ACI code. The test results showed that the moment magnifier method is conservative.

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