Eurocode-based design proposal for non-continuously stiffened steel panels subjected to uniform compression

Abstract

The contribution presents a design proposal for non-continuously longitudinally stiffened steel panels subjected to uniform compression. In this approach, the longitudinal stiffeners end within the panel, leaving a gap before reaching the transverse stiffener or the end of the girder. Experimental tests are used to validate a numerical model, with which a numerical parametric study is developed using geometrically and materially nonlinear analyses with imperfections (GMINAs) to cover a variety of geometry parameters and imperfections forming the basis of the design proposal. The design procedure is based on the reduced stresses method from EN 1993-1-5 considering all failure mechanisms collectively. The underlying critical stresses are determined numerically, while all subsequent steps are analytically calculated. In parallel, the procedure addresses the problem of weld fractures at the stiffener ends employing numerically validated constructive requirements. The design proposal provides desirable results for small gaps relevant to construction practice. In conclusion, a reliability analysis was conducted following EN 1990 and discussed based on two scenarios.