POST-BUCKLING BEHAVIOR OF COLD-FORMED STEEL SQUARE PLATE FIXED SUPPORTED UNDER PURE SHEAR

Abstract

The ability to resist loads after experiencing elastic buckling is post-buckling strength, an important factor in the design and analysis of thin-walled structures. Many models are based on tension field actions, which state that the main source of post-buckling strength is the development of tensile stresses in certain diagonal planes. Post-buckling behavior has been extensively investigated in hot-rolled steels for a long time; however, it has not been extensively studied in cold-formed steels (CFS). This study presents experimental and finite element models for pure shear from CFS, namely Galvanized 550, with thicknesses of 0.5 mm and 0.7 mm. An experimental test using a square plate clamped on each side. The plate is placed at a 45-degree angle and then pressed. The clamp will transmit force to the plate like shear. A finite element model using Abaqus, where the plate is on the XY plane, where displacement Z and X, Y, Z rotations are 0. The results of this study show that the first compressive stress appears at the corner, but the compressive stress continues to increase towards the middle of the diagonal. The developed finite element model gives conservative shear load results. The deformation of the finite element model gives the same shape as the experimental test. These findings can help better understand the post-buckling behavior and show a finite element model that is easy to apply.