Nonlinear finite element analysis of stainless steel corrugated web girders subjected to patch loading

Examensarbete på grundnivå
Sæmundsson, Daníel
Ingólfsdóttir, Signý
In recent years, the use of corrugated web girders has been increasing all around the world. The shape of the corrugation can provide increased shear stiffness and sufficient lateral stability in the girder without introducing transverse stiffeners and are thus well suitable for certain types of structures such as bridges. Stainless steel can be a beneficial choice of material for these girders as they are often used in corrosive environment with limited accessibility for maintenance. With the increased strength of stainless steel, compared to carbonated steel, the combination of thin-walled stainless steel and the corrugated shape can provide an optimal solution with respect to the environment, life cycle cost and structural capacity due to being lightweight. Steel girders are often subjected to patch loading in various locations, for example during transportation, construction phase, operation etc. Limited research has been conducted on the patch loading capacity of trapezoidal corrugated web girders made from stainless steel subjected to patch loading. In this thesis, an extensive finite element (FE) parametric study was performed for analysis of the patch loading resistance of stainless steel girders with trapezoidal corrugated webs as well as an overview of existing theoretical, numerical, and analytical research on the subject. In the parametric study three different load locations are considered for the patch loading, that is central loading on the longitudinal fold, inclined fold and at the intersection of the folds. The geometrical parameters that have been examined in the study are: number of unit cells, flange width, corrugation angle, depth of the corrugation, flange- and web thickness. The results of this parametric study are compared to four existing design models and the formula from the newest draft of Eurocode 3 to examine its validity and accuracy level for stainless steel corrugated web girders. The results showed that the Eurocode 3 formula was very conservative and none of the other available design models analyzed in this study were conservative enough compared to the FE-analysis. The longitudinal load case showed different behavior for the patch loading resistance compared to the other two load cases. Different failure mechanisms had a large influence on the patch loading resistance.
Trapezoidal corrugated web, stainless steel, deep girder, patch loading , resistance, parametric study, patch load
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