Research Information System
JOURNAL OF EARTHQUAKE ENGINEERING, vol.29, pp.1-33, 2025 (SCI-Expanded)
This study presents the cyclic behavior of beam-column profiles subjected to combined axial load and uniaxial/biaxial bending. In order to observe the differences in the cyclic behaviors of the sigma channel section (S) beam-column profiles, 500, 1000, and 1500 mm length specimens were subjected to cyclic loading at 15 different points. Monotonic loading experiments were also carried out at the same points to determine the differences between monotonic and cyclic loading. A total of 45 monotonic and 45 cyclic tests were performed. The results obtained from the experimental study showed that there were differences in the buckling modes, load bearing capacities and dissipated energy amounts of the profiles under monotonic and cyclic loading. It was determined that the behavior was similar in monotonic and cyclic loading until buckling, but after buckling, there was a rapid strength loss in cyclic loading. In the experimental study, the cyclic behavior of the profiles changed depending on the eccentricity, differences were observed in the failure mechanisms, and it was determined that the energy dissipated decreased as the eccentricity and the length of the profiles increased. Additionally, a finite element model was developed considering material hardening parameters and geometric imperfections, and the behaviors of sigma and lipped channel (C) profiles under cyclic loading were investigated comparatively by using the results of 90 cyclic analysis performed in Abaqus software. The analysis results showed that sigma section profiles behave in a more ductile manner by consuming more energy in equal cross-sectional lengths. Additionally, it is more advantageous to orient the flanges of the profiles to withstand tensile stresses.