Ductility Performance and Ultimate Axial Compression Ratio of Steel Reinforced Concrete Columns with T-shaped Steel Cross-section

Axial compression ratio is a critical factor which affects the structure's ductility and resistance to progressive collapse.Through 12 specimens of T-shaped steel reinforced concrete columns under cyclic load loading test,the failure mode,hysteretic characteristics and ductility performance were investigated. The axial compression limit of T-shaped steel reinforced concrete columns was derived by the balanced failure method. The result indicated that T-shape steel reinforced concrete column possesses a good ductility performance,the specimens with λ = 2. 5 failed in bending,whereas the specimens of shear-span ratio λ = 2. 0 failed in shear compression under cyclic load. Based on the relation between the experimental and the design axial compression ratio,the axial compression ratio limit of steel reinforced concrete columns with T-shape in different seismic level was proposed,which could provide a reference for seismic design.