Lateral-distortional buckling formulae for hollow tubular flange plate girders with slender unstiffened webs

摘要

In this paper, the Lateral-Distortional Buckling (LDB) of Hollow Tubular Flange Plate Girdersrn(HTFPGs) with slender unstiffened webs is investigated. Firstly, shell finite strip analyses are performed tornhave a first glance on the elastic buckling behaviour of simply supported girders under uniform bending. Thernnumerical results clearly show the girder length range in which LDB is relevant. After these analyses, analyticalrnmodels to calculate the critical LDB moment are proposed and validated by comparison with numerical values.rnThe formulae for lateral-distortional buckling of HTFPGs are shown to be accurate and they provide the meansrnto obtain M_(cr) values analytically without resorting to numerical tools.