Seismic behavior of steel reinforced concrete L-shaped columns under-compression-bending-shear and torsion
Mo Linlin1 Chen Zongping1,2 Xu Dingyi1
1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2. Key Laboratory of Disaster Prevention and Structure Safety of the Ministry of Education, Guangxi University, Nanning 530004, China
Abstract：To investigate the seismic performance of steel reinforced concrete (SRC) L-shaped columns under compression-bending-shear and torsion, 12 steel reinforced concrete L-shaped columns were tested, in which the steel layout form, the torsion bending ratio, and the ratio of limb height to limb thickness were considered. Based on the test data, the failure characteristics, hysteretic curves, ductility, stiffness and energy dissipation of the L-shaped columns were compared and analyzed. The influence laws of different steel forms on the seismic performance index of the L-shaped column under the combined stress of compression-bending-shear and torsion were studied. The results show that the failure characteristics of SRC L-shaped columns with different torsion to bending ratios can be divided into bending failure, bending shear failure and bending torsion failure. The steel layout form affects the final damage degree of the specimens and the moment-displacement and torque-torsion angle hysteretic curves exhibit a pinch effect. The torsion resistance of the specimen increases with the torsion to bending ratio, while the bending capacity becomes weaker, and the stiffness degradation is faster. The ductility and energy dissipation of the SRC L-shaped columns can be improved by reducing the ratio of limb height to limb thickness. A comprehensive analysis shows that the open web T-shaped SRC L-shaped column has good seismic performance under the combined stresses of compression-bending-shear and torsion.
