Experimental research on steel reinforced high-strength concrete short columns in seismic performance

For the brittleness of high strength concrete widely used in high-rise building and long-span construction,steel is encased in high strength concrete to decrease the brittleness and improve the ductility of high strength concrete structures.The experimental research on seismic performance of thirteen steel encased in high strength concrete short column(λ=2.0) subjected to low cyclic reversed lateral loads is carried out.The failure characteristics,hysteretic characteristics and skeleton curves of steel encased in high strength concrete short column are analyzed.The influences of axial compression and stirrup ratio on the seismic performance are studied.The relation curves of axial compression ratio and stirrup ratio to displacement ductility coefficient are concluded.According to the experimental results,the limited values of axial compression and minimum hoop reinforcement ratio are suggested,which satisfy the certain ductility requirements.The suggested values may provide reference for codes revision and engineering design.