I-girders with unstiffened slender webs subjected by bending and shear interaction

Longitudinally unstiffened steel I-girders are commonly used structural elements in the engineering practice. Previous research results proved that the current design method of the EN1993-1-5 EN 1993-1-5 (2005) for M-V interaction check is not always on the safe side for longitudinally stiffened girders, however a systematic review of the M-V interaction behaviour for unstiffened girders was missing from the international literature. The aim of the current paper is to analyze the M-V interaction behaviour of longitudinally unstiffened I-girders with slender webs and to determine the applicability interval of the M-V interaction resistance model of the current EN1993-1-5 EN 1993-1-5 (2005) . Based on the executed numerical investigation a refined M-V interaction equation is proposed to ensure safe design in the whole analyzed parameter range.