轴压比对高强钢筋混凝土异形柱抗震性能影响研究

通过对高强钢筋混凝土异形柱试件进行低周往复加载试验,对比分析异形柱试件的破坏特征、承载能力、位移及延性、滞回特征、骨架曲线、刚度退化和耗能能力等抗震性能指标,研究轴压比对高强钢筋混凝土异形柱抗震性能的影响。研究表明:轴压比对高强钢筋混凝土异形柱的抗震性能影响效果显著。减小高强钢筋混凝土异形柱试件的轴压比能够增加高强钢筋混凝土异形柱试件的变形能力,改善异形柱试件的延性性能及滞回性能,减缓试件的刚度退化。增加高强钢筋混凝土异形柱试件的轴压比可以提高试件的极限承载能力。

EFFECT OF AXIAL COMPRESSION RATIO ON SEISMIC BEHAVIOR OF SPECIALLY SHAPED COLUMNS WITH HIGH STRENGTH STEEL BARS

Based on the low cyclic loading experiments on specially shaped columns,it was compared that the results in terms of damage characteristic,bearing capacity,displacement and ductility,hysteretic characteristic,skeleton curve,rigidity degradation and energy dissipation.The effect of axial compression ratios on seismic behavior of specially shaped column with high strength steel bar was analyzed.It was shown that the axial compression ratio had greater influence on seismic behavior of specially shaped column with high strength steel bar.With the decrease of axial compression ratio,the deformation capacity of specially shaped column with high strength steel bar was enhanced,the ductility and hysteretic characteristic was improved and the rigidity degradation becomes slow.The bearing capacity of specially shaped column with high strength steel bar was enhanced with the increase of axial compression ratio.