Bending and shear buckling interaction behaviour of I-girders with longitudinally stiffened webs

Steel I-girders with longitudinally stiffened webs are commonly used in the civil engineering field, especially in bridges. Therefore, the load-carrying capacity of these types of girders under a combined loading scenario (interaction of bending and shear) is an important feature of the design. Previous research results proved that the current design method of EN1993-1-5 [1] does not always provide safe resistances for the M-V interaction in scenarios where longitudinally stiffened and unstiffened girders are utilised. Because there has only been a small number investigations on this topic, a systematic review of the M-V interaction behaviour for unstiffened girders was executed by Jáger et al. [2] in 2016. This type of review is still missing in international literature for longitudinally stiffened girders; therefore, the current study focuses on the M-V interaction behaviour of longitudinally stiffened I-girders with slender webs, and investigates the applicability of the M-V interaction resistance model developed for unstiffened girders [2].