摘要
研究钢筋混凝土矩形柱在压弯剪扭复合受力下的抗震性能,进行4根钢筋混凝土矩形柱的拟静力试验,考虑扭转偏心距、体积配箍率、轴压比的影响。试验结果表明,有扭转偏心距的试件破坏具有弯扭破坏形态,无扭转偏心距作用的试件发生受弯破坏,扭转偏心距的存在会降低柱的延性,使耗能能力下降,加快刚度退化;轴压比对具有扭转偏心距试件的影响与没有扭转偏心距试件相似,轴压比大的试件屈服荷载增大,但延性和耗能能力降低;提高体积配箍率能改善有扭转偏心距试件的延性和耗能能力,降低刚度退化速度,可作为改善承受压弯剪扭复合作用的钢筋混凝土柱抗震性能的措施。
This paper presents a pseudo static test on four reinforced concrete rectangular columns.The goal of this experiment was to obtain the seismic behavior of reinforced concrete rectangular columns under the compound effect of compression,flexure,shear and torsion. The influence of torsional eccentricity, volume stirrup ratio and axial compression ratio had been taken intoconsideration. The experimental results revealed that the specimens with torsional eccentricity performed bending-torsion failure mode and the ones without torsional eccentricity experienced bending failure. Further more,torsional eccentricity can reduce the ductility and energy dissipation capacity of the specimens,which led to the acceleration of stiffness degradation. It is found that axial compression ratio has the same influence towards the specimens with and without torsional eccentricity. The specimen with a larger compression ratio has a higher yield load,while the ductility and energy dissipation capacity are lower. Increasing volumestirrup ratio can improve the ductility and energy dissipation capacity,reduce the stiffness degradation rate and is therefore able to be considered as a measure to improve the seismic behavior of the reinforced concrete rectangular columns under the compound effect of compression,flexure,shear and torsion.
引文
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