ANALYTICAL STUDY ON THE BENDING STRENGTH OF STEEL I-GIRDERS CONSIDERING WITH INTERACTION BETWEEN LOCAL BUCKLING AND LATERAL-TORSIONAL BUCKLING

Abstract

In the current specifications for highway bridges in Japan, interactions between lateral torsional buckling and the local buckling of the flange plate and/or web plate, and between the local buckling of a flange plate and a web plate are not considered for the ultimate bending strength for steel I-girders. In this study, a series of finite element analysis were performed on homogeneous and hybrid steel I-girders. The ultimate bending strength through the analytical results were compared with the estimated ultimate strength based on several formula proposed by other reearchers. In addition, design equations were proposed for the bending strength of both homogeneous and hybrid I-girders considering the interaction between the local buckling and the lateral torsional buckling.