Stability and Resistance Based Numerical Analysis of Stiffened Metallic Panels under Shear Buckling Phenomenon
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This paper presents a numerical investigation into the stability and shear resistance of stiffened metallic panels in composite beams. The primary objective is to evaluate the shear buckling behavior of web panels in beams connected to concrete slabs of varying thicknesses (15 cm, 20 cm, and 25 cm). Using finite element modeling in ANSYS APDL, both critical shear buckling coefficients and ultimate shear capacities are determined. The influence of slab thickness, stiffener spacing, and web geometry on the shear performance is analyzed. Results show that increasing the concrete slab thickness improves the shear buckling coefficient, thereby enhancing overall stability. However, the ultimate shear resistance decreases beyond a slab thickness of 20 cm due to the additional self-weight of the concrete. Comparisons with Eurocode 3 formulations validate the numerical outcomes and support the proposed empirical corrections to the classical buckling coefficient equations for composite systems.
