Improved shear buckling resistance model for hybrid I-girders with slender web

Bärnkopf, Erzsébet and Radwan, Mohammad and Kövesdi, Balázs Géza (2025) Improved shear buckling resistance model for hybrid I-girders with slender web. JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, 235. No. 109899. ISSN 0143-974X

Preview

Text 1_ImprovedshearbucklingresistancemodelforhybridI-girderswithslenderweb.pdf - Published Version Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (6MB) | Preview

Abstract

The present study focuses on examining the shear buckling behavior and the interaction between shear and bending (M–V interaction) in longitudinally unstiffened girders with slender webs. The applicability of the existing shear buckling resistance model, given in EN 1993-1-5, is evaluated through comprehensive numerical analysis. Based on the results, an enhanced design equation is proposed to improve accuracy, optimize safety, and cost-efficiency in the design of hybrid girders. The parametric numerical investigation indicates that the contribution of the flange to shear buckling resistance does not conform to the current EN 1993-1-5 rules. Specifically, for girders with lightweight flanges, the existing approach underestimates the flange's contribution, leading to overly conservative resistances. Conversely, for I-girders with heavy flanges, the current method may produce unsafe predictions. Moreover, the study identifies inconsistencies and inaccuracies in the present design equation for hybrid girders, showing that the current resistance model does not accurately reflect the shear capacity of hybrid configurations. Therefore, a new, refined design formula is proposed to more accurately estimate the flange contribution, aligning closely with numerical simulation results.

Actions (login required)

View Item