Numerical modeling of lean duplex stainless steel hollow columns of square, L-, T-, and +-shaped cross sections under pure axial compression

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• 作者：M. Longshithung Patton ; Konjengbam Darunkumar Singh ; ^{darun@iitg.ernet.in}
• 关键词：Buckling ; Lean duplex stainless steel section ; Finite element modeling ; Square and NRCs sections
• 刊名：Thin-Walled Structures
• 出版年：2012
• 期刊代码：175_02638231
• 类别：et
• 出版时间：April, 2012
• 卷：53
• 期：Complete
• 页码：1-8
• 文件大小：1692 K

摘要

In this paper, finite element (FE) studies for LDSS (Lean Duplex Stainless Steel) hollow columns with square, L-, T-, and +-shaped cross sections (i.e., SHC, LHC, THC and +HC respectively) are presented using ABAQUS, to gain an understanding of the cross sectional shape effects. The LDSS hollow columns having equal material cross-sectional areas with thickness varying from 5 m to 20 mm were subjected to uniform axial compression. Short/Stocky columns with lengths (鈭?800 mm) of about three times the outer width of square were considered for the analyses. Based on the analyses, it has been found that for all the NRHCs (i.e., LHC, THC and +HC) considered, a nearly linear variation of P_u with section thicknesses has been observed, although the increase for SHC was relatively slower in thinner sections (t<12.5 mm). The%increase in P_u with 300%increase in t (from 5 m to 20 mm) has been found to be 鈭?273%, 1252%, 1041%and 679%, respectively, for square, L-, T-, and +-shaped sections. The gain in P_u for LHC, THC and +HC sections as compared (expressed as P_u/P_u(sq)) to SHC are in the range 120%-150%, 130%-170%, 140%-230%, respectively. Ductility at ultimate load has been observed to be 鈭?.1-0.6%for SHC, LHC and THC (all thicknesses), and +HC (t鈮?0 mm).