수평곡선 I형 플레이트거더의 플랜지 국부좌굴에 관한 해석연구

Unlike the straight girders, horizontally curved girders are subjected to not only bending moments but also torsional moments. It is well known that 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 ultimate moments for curved girders. The subtended angle and slenderness ratio are taken as parameters.