A Study on the Buckling of Welded Built-up Structure (Report I)

The lateral (torsional) buckling of welded plate girder

Abstract

In the present report, the author attempted to give a practically applicable method for the most economical design of the welded built up I-girder which is subjected to a bending moment. In the first place, he developed a theory on the lateral buckling, in which the deformation of web plate was considered, and the local buckling of flange plate.
The results of his study were as follows:
1) The formula which gives the critical value of the lateral buckling of I-girder had two more terms added to the already known one. These important corrected terms set a certain limit especially to the depth and width of flange plate. This formula was shown as (24) in this paper.
2) The local buckling strength of flange plate, in which the elastic supported condition by web plate was considered, decreased with the increase of h/b and d/t where
h: height of web plate, t: depth of web plate
b: width of flange plate and d: depth of flange plate.