Effect of using slender flanges on EN 1993-1-5 design model of mono-symmetric S460 corrugated web bridge girders

Eurocode (EC3) bending moment design model of mono-symmetric corrugated web girders (CWGs) is based on the critical failure mode among tension flange yielding, compression yielding and lateral-torsional buckling (LTB) flange. Recently, LTB behaviour S460 laterally-unrestrained CWGs with fully-effective flanges has been investigated by authors, from which EC3 modified to better represent their actual strength. Nevertheless, effect local (LB) slender flexural strength such long not examined. While potentially makes large contribution out-of-plane stiffness, LB expected reduce resistance girder significantly. Principally, this paper devoted exploring accuracy model. Currently, virtual tests, using ABAQUS software, are generated accurate validation. Then, parametric studies, intentionally designed eliminate carried out simply supported considering mainly influences dimensions CWGs. The strengths compared model, it found provide unsuitable predictions. Hence, new formula proposed accord FE results. Additionally, several conclusions provided at end assist engineers in suggesting efficient cross-sections.