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

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. Keywords : Curved I-girder, Flange local buckling, Stress gradient 본 논문은 건설교통부가 출연하고 한국건설교통기술평가원에서 위탁시행한 건설교통기술촉진연구사업의 연구비 지원(12기술혁신B01-곡선 강교량의 합리적인 LRFD 설계기술 개발)에 의해 수행됨 * Corresponding Author : Young-Jong Kang(Korea Univ.)Tel: +82-2-927-7715 email: yjkang@korea.ac.krReceived August 18, 2015 Revised September 2, 2015 Accepted October 8, 2015 Published October 31, 2015