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An Analytical Study of Flange Local Buckling of Horizontally Curved I-Girders for Estimate Resonable Stress Gradient

합리적 응력경도 산정을 위한 수평 곡선 I-형 거더의 플랜지 국부좌굴의 해석적 연구

  • Kim, Hee-Soo (School of Civil, Environmental and Architectural Engineering, Korea Univ.) ;
  • Lee, Kee-Sei (School of Civil, Environmental and Architectural Engineering, Korea Univ.) ;
  • Lee, Jeong-Hwa (School of Civil, Environmental and Architectural Engineering, Korea Univ.) ;
  • Choi, Jun-Ho (Research Institute for Mega Structures, Korea Univ.) ;
  • Kang, Young-Jong (School of Civil, Environmental and Architectural Engineering, Korea Univ.)
  • 김희수 (고려대학교 건축사회환경공학과) ;
  • 이기세 (고려대학교 건축사회환경공학과) ;
  • 이정화 (고려대학교 건축사회환경공학과) ;
  • 최준호 (고려대학교 초대형구조기술연구소) ;
  • 강영종 (고려대학교 건축사회환경공학과)
  • Received : 2015.08.18
  • Accepted : 2015.10.08
  • Published : 2015.10.31

Abstract

Horizontally curved I-girders are subjected to not only bending moments but also torsional moments. The torsional moment of the plate girder is addition of St. Venant torsion and non-uniform torsion. In the flange of I-shaped plate girder, a kind of open-section, the normal stresses is not distributed uniformly due to the non-uniform torsion. Because of that, one of compression flange tip can be yielded faster than the flange of general straight girder. In other words, the flange local buckling strength is decreased when the girder has initial curvature. In this paper, the numerical analysis is conducted to investigate the average stresses in flange for curved girders. The subtended angle and slenderness ratio are taken as parameters.

Acknowledgement

Grant : 곡선 강교량의 합리적인 LRFD 설계기술 개발

Supported by : 한국건설교통기술평가원

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