Structural response of perforated CFS angle columns with longitudinal stiffeners under axial compression
Priyanka R. Bhivgade,Keshav K. Sangle,Umesh A. Mask,Vikram Singh
Abstract
This study examines the axial buckling behaviour of perforated cold-formed steel (CFS) equal-angle
face-to-face built-up columns strengthened with longitudinal stiffeners through experimental testing, finite element
analysis, and theoretical evaluation. Circular perforations introduced for service integration reduce sectional stiffness
and increase susceptibility to local, distortional, and global buckling. Experimental tests were conducted on 1.2 mm
thick, 900 mm long built-up CFS angle columns with stiffener spacing of 50, 100, and 150 mm under pinned–pinned
axial compression, and the resulting load–deflection responses and failure modes were used to validate nonlinear
finite element (FE) models developed in ABAQUS incorporating geometric imperfections and material nonlinearity,
which were subsequently extended to parametric studies covering section thicknesses of 1.2–1.6 mm and member
lengths of 900–1600 mm. Results indicate that decreasing stiffener spacing significantly enhances buckling
resistance, with 50 mm spacing increasing axial capacity by up to 45 % compared with unstiffened columns.
Stiffener spacing, section thickness, and column slenderness were found to govern buckling mode transitions. DSM
based calculations were evaluated and show reasonable consistency with the experimental and numerical results for
perforated and stiffened members. The findings provide quantitative design guidance for perforated CFS built-up
angle columns in accordance with AISI S100 and IS 801.
Key Words
ABAQUS; buckling modes; cold formed steel; Finite Element Analysis and Direct Strength Method (DSM); perforated equal angle section; stiffener spacing
Address
Priyanka R. Bhivgade — Veermata Jijabai Technology Institute, Structural Engineering Department, Mumbai, India
Keshav K. Sangle — Veermata Jijabai Technology Institute, Structural Engineering Department, Mumbai, India
Umesh A. Mask — Veermata Jijabai Technology Institute, Structural Engineering Department, Mumbai, India
Vikram Singh — Veermata Jijabai Technology Institute, Structural Engineering Department, Mumbai, India
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