配置HRB500钢筋的混凝土异形柱抗震性能试验研究

Experimental research on seismic behavior of HRB500 RC specially shaped columns

通过对4根+形和4根T形配置HRB500钢筋的混凝土异形柱试件进行低周往复荷载试验,对比分析了试件的破坏特征、承载能力、位移及延性、滞回特征、刚度退化、耗能能力及累积损伤等抗震性能指标,研究轴压比和配箍特征值对高强钢筋混凝土异形柱抗震性能的影响。研究表明:试件的破坏形态为弯曲剪压型;随着轴压比的增加,试件的极限承载力提高,但试件的变形能力和延性降低,刚度退化加快;增大配箍特征值,提高了试件的开裂荷载、变形能力及延性,改善了试件的滞回特性,减轻了试件的累积损伤程度。研究结果为配置高强钢筋的混凝土异形柱结构设计提供了参考。

Based on the low cyclic loading experiments on four cross-shaped and four T-shaped specially shaped columns, the results in terms of damage characteristic, bearing capacity, displacement and ductility, hysteretie characteristic, rigidity degradation, energy dissipation and accumulated damage are comped. Those effects on seismic behavior of HRBSO0 RC specially shaped column were analyzed such as the axial compression ratio and stirrup characteristic value. With the increase of axial compression ratio, the bearing capacity of HRBS00 RC specially shaped columns is bigger while the deformation capacity and ductility are worse and rigidity degradation is faster. With the increase of stirrup characteristic value, the cracking load, deformation capacity and ductility of specimens is bigger, the hysteretic characteristic is improved and the degree of accumulated damage is lightened. The conclusions of HRBS00 RC specially shaped column can be references for structural design.