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Shear characteristics of rectangular Lean Duplex Stainless Steel (LDSS) tubular beams ? a finite element study

Sonu J.K, Konjengbam Darunkumar Singh

This paper reports a numerical study of the shear behavior of Lean Duplex Stainless Steel (LDSS) hollow beams subjected to three point loading. The parameters considered to determine the shear capacity of present finite element model were web thickness of 2-30 mm and ratios of flange thickness to web thickness in the range of 2-5 for each web thickness. Based on the FE analyses, it has been observed that the ultimate shear strength and ductility of hollow sections increased with decreasing web height/thickness ratio (hw/tw) and increasing flange thickness / web thickness ratio (tf/tw). In comparison to EN 1993-1-4 (2006), FE predicted slightly higher values of ultimate shear, with good agreement on the overall behavior of ultimate load with variation in hw/tw, indicating the applicability of the present EN 1993-1-4 (2006) on the shear design of LDSS rectangular hollow steel. However, the predictions by FE on shear buckling reduction factor showed higher values (~ 20-140% higher) that those predicted by EN 1993-1-4 (2006).