Experimental Research On Seismic Behavior Of Steel Reinforced Concrete Columns With Cross Section

To improve the bearing capacity and seismic behavior of reinforced concrete columns with special section,it is proposed that adding steel into them to constitute the steel reinforced concrete columns with special section.The steel effection on seismic behavior of reinforced concrete columns with special section has been researched,which provides experimental support and theoretical foundation for generalization and design.Six specimens with different axial compression ratio and form of steel layout have been tested under low cyclic loading.The damage characteristic,steel strain,stirrup strain,longitudinal strain,concrete strain,hysteretic curves,skeleton curves,ductility performance,rigidity degeneration,energy dissipation capacity and accumulative damage have been analyzed.It is shown that the damage state,shear performance,seismic behavior are improved observably.With the axial compression ratio increasing,the appearance of new cracks are restrained after yield point,and the crack width is reduced.Moreover,the bearing capacity is improved,the ductility performance and energy dissipation capacity are weakened.In addition,the rate of rigidity degeneration and accumulative damage are aggravated.The seismic behavior of specimens of T-shaped steel combined with square steel tube are prior to the one of solid-web steel.The numerical simulation of the steel reinforced concrete columns with special section has been carried out through ABAQUS finite element model.The simulative results are in good agreement with the experimental results,based on which the effection of concrete strength,steel strength and steel ratio on seismic behavior have been explored.The results show that improving the strength of concrete has little impact on bearing capacity,but the energy dissipation capacity is improved.Besides,the bearing capacity and energy dissipation capacity are improved by increasing the steel strength and steel ratio.