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Effect of Multi-cell Cross-section on Thin LDSS Hollow Stub Column under Pure Axial Loading

Rohan Dadasaheb Mane, Konjengbam Darunkumar Singh

In this paper, finite element (FE) studies for LDSS (Lean Duplex Stainless Steel) square hollow, single wall, diagonal walls and double walls hollow stub columns (i.e. SHC, -HC, XHC, and +HC respectively) are presented using Abaqus, to gain an understanding of multi-cellular cross sectional effects on ultimate strength of column. The LDSS hollow columns having equal material cross-sectional areas with thickness varying from 1 mm to 10 mm were subjected to uniform axial compression. The length of the columns (~1800 mm) of about three times the outer width of SHC was considered for analyses to maintain stockiness of columns. Based on the analyses, it has been found that for all the hollow columns considered, a nearly linear variation of Pu with section thickness has been observed. The increase in Pu with 300 % increase in thickness (from 2.5 mm to 10 mm) is of order ~ 1040 %, 1080 %, 1037 % and 989 % for SHC, -HC, XHC and +HC respectively. In comparison with SHC, multi-cellular columns performed better in terms of Pu. It is found that the increase in Pu/Pu(SHC) is relatively lesser for t ≤ 2.5 mm compared to other higher thicknesses; for t > 2.5 mm the effect of t on Pu/Pu(SHC) is not very apparent. A nearly linear increase (> ~ 100%) in Pu has been seen as the sections are changed from SHC→-HC→XHC→ +HC.