Construction and Steel Structure

Biography

Biography: Ezzeldin Yazeed Sayed-Ahmed

Abstract

Steel girders with corrugated steel webs were lately emerged as a new structural system for bridges with multiple merits. The flanges of these girders provide the girder’s flexural strength with “almost” no contribution from the corrugated steel web which mainly provides the girder’s shear capacity. Failure of the corrugated web occurs by steel yielding, web buckling or interactively between both of them. Lateral torsion and local flange buckling of corrugated steel web girders present another two possible failure criteria for these girders. In this article, the work performed by the author on corrugated steel web girders is compiled and presented in a comprehensive format which leads to introducing full design procedures for such girders. The starting point is the shear behaviour of the corrugated steel webs which is investigated focusing on the failure modes affecting the web design. An interaction equation that considers web “local and global” buckling and steel yielding is proposed. Numerical analyses are performed to investigate the different buckling modes of the corrugated steel web, verify the validity of the proposed equation and explore the post-buckling strength of corrugated steel web girders. The numerical model is extended to determine the critical moment causing lateral instability for the corrugated steel web girders. The applicability of the critical moment design equations, currently used for plane web girders, to corrugated steel web ones is examined. The numerical model is then used to scrutinize the local buckling behaviour of the compression flange of corrugated steel web girders. The applicability of the currently used limiting values for the flange outstand-to-thickness ratios to corrugated web girders is investigated.