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The paper investigates the shear resistance of I-girders longitudinally stiffened by trapezoidal stiffeners. It first reports on 4 full-scale tests performed at RWTH Aachen, on stiffened panels with strong closed stiffeners. As expected, failure in the subpanels has been governing. A devoted FEA shell model is then described and validated towards these results and other experimental sources. Parametric studies led with the numerical tool help pointing out several aspects where the Eurocode 3 Part 1.5 recommendations on stiffened panels in bending and shear may be improved.

EXPERIMENTAL AND NUMERICAL INVESTIGATIONS FOR I-GIRDERS IN BENDING AND SHEAR STIFFENED BY TRAPEZOIDAL STIFFENERS