不同加载角度与轴压比下RC短柱抗震性能试验研究

Experimental study on seismic behavior of RC short columns under different loading angle and axial compression ratio

进行了加载角度为0°、22.5°及45°的钢筋混凝土方形短柱试件在轴压比分别为0.2及0.6下的低周往复加载试验,从破坏形态、承载力、延性及耗能能力等方面对钢筋混凝土方形短柱的抗震性能进行了研究。结果表明:增大轴压比能有效提高RC方形短柱的承载能力、耗能能力和减缓试件的后期强度退化,但同时会加速其刚度退化;加载角度对试件的承载力及刚度退化基本上没有影响,但延性、耗能能力及强度退化率会随加载角度的增加而增大。

The low cycle reversed loading tests on reinforced concrete square short columns with different loading angles of 0° ,22.5° ,45° and different axial compressive ratios of 0.2 and 0.6 were conducted. The seismic behaviors about failure mode, bearing capacity, ductility and energy dissipation capacity were analyzed by the test results. It turned out that increasing axial compressive ratio will enhance the bearing capacity, energy dissipation capacity, slow down the degradation of strength in later stage, but accelerate the degradation of rigidity. The load angle do not change the bearing capacity and the degradation of rigidity, but the ductility, energy dissipation capacity and degradation of strength will increase with the increasing of the load angle.