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

作者：Patton M Longshithung; Singh Konjengbam Darunkumar

来源：Thin-Walled Structures, 2012, 53: 1-8.

DOI：10.1016/j.tws.2012.01.002

• Buckling
• Lean duplex stainless steel section
• Finite element modeling
• Square and NRCs sections

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 LOSS 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 (similar to 1800 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 similar to 1273%, 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 similar to 0.1-0.6% for SHC, LHC and THC (all thicknesses), and +HC (t <= 10 mm).

• 出版日期2012-4