T形截面钢-混凝土组合异形柱抗震性能试验研究

Experimental research on seismic behavior of steel-concrete composite T-shaped columns

为研究T形截面钢-混凝土组合异形柱的抗震性能,对4根不同配钢形式和轴压比试件进行低周反复荷载试验.基于实测的滞回曲线和破坏形态,分析配钢形式、轴压比对滞回特性、骨架曲线、延性、刚度退化和耗能性能的影响.研究表明:试件均发生弯曲破坏;配钢形式为T形钢+方钢管试件较实腹式试件除承载力略低外其他抗震性能指标均较好;轴压比较大时,试件承载能力提高,达到极限承载力后刚度退化较快,延性降低;型钢的加入使钢-混凝土组合异形柱的承载能力、变形能力及延性明显提高.

To research the seismic behavior of steel-concrete composite T-shaped columns,a series of low cyclic loading tests on 4 specimens with different reinforcement forms,axial compression ratios are carried out.Based on the measured hysteresis loops and failure modes,the influences of reinforcement forms,axial compression ratios on the hysteresis characteristics,skeleton curves,ductility,stiffness degeneration and energy dissipation capacity are analysised.The research indicates that all of the specimens occurred bending failure.The seismic behavior of specimens of T-shaped steel combined with square steel tube is superior to solid-web steel reinforced concrete cross-shaped column except the bearing capacity.When the axial compression is higher,the bearing capacity can be improved and the stiffness degradation is faster while reaching the ultimate bearing capacity.The bearing capacity,deformability and ductility of the steel concrete special-shaped columns enhanced obviously with the adding of steel.