配筋圆钢管自密实混凝土柱抗震性能试验研究

通过7根配筋圆钢管自密实混凝土柱和1根圆钢管自密实混凝土对比柱的低周反复荷载试验，研究了纵筋配筋率、轴压比和钢管壁厚对配筋圆钢管自密实混凝土柱的承载力、延性、耗能能力和性能退化规律的影响。试验结果表明：配筋圆钢管自密实混凝土试件的滞回曲线饱满，表现出良好的抗震性能，在加载中后期，配筋试件的纵筋屈服，强度得到发挥，配筋圆钢管自密实混凝土试件的承载力和延性较普通圆钢管自密实混凝土试件均有不同程度提高，同时，耗能性能提高，且纵筋配筋率越大，配筋圆钢管自密实混凝土试件的承载力和延性也越大。轴压比和钢管壁厚对配筋圆钢管自密实混凝土柱抗震性能的影响规律与普通圆钢管混凝土柱相同。

Experimental study on seismic behaviors of reinforced self compacting concrete filled circular steel tube columns

The behavior of reinforced self compacting concrete filled circular steel tube (RCFST) columns under seismic load was investigated by testing 1 concrete filled circular steel tube (CFST) column and 7 RCFST columns which were subjected to a constant axial loading and a cyclic lateral loading. The effects of the reinforcement ratio, the axial loading level and the steel ratio on the strength, ductility and energy dissipation of the RCFST columns were studied. The experimental results indicate that the hysteretic curves of RCFST columns were plump, and they demonstrated good seismic performance.In the following loading periods, the longitudinal reinforcement of RCFST columns yield, and their strength was efficiently mobilized. RCFST columns display an obvious increase in the strength, ductility and energy dissipation with the increase of reinforcement ratio. The effects of the axial loading level and the steel ratio on the seismic performance of RCFST column were similar to CFST column.