性能增强再生骨料混凝土柱抗震性能试验研究

SEISMIC BEHAVIOR EXPERIMENTAL RESEARCH ON PERFORMANCE ENHANCEMENTS OF RAC COLUMN

基于再生混凝土框架模型,设计制作了4根不同配比的再生混凝土柱模型,并对其进行了低周反复试验研究。通过试验对比了4根不同配比柱子的破坏形态、滞回特性、刚度退化、延性性能,研究硅粉及再生混杂纤维对普通再生混凝土柱抗震性能的影响。结果表明:相较于普通再生混凝土柱,单掺硅粉使开裂荷载、屈服荷载及其对应位移稍有增加,但极限荷载及位移略有降低。若同时掺入适量的再生混杂纤维,则能更为有效地提高普通再生混凝土柱各项抗震性能指标。

Four recycled concrete column models with different proportions were designed and created based on the following recycled concrete frame model. Meanwhile, cyclic loading tests for them were carried out. It was compared the failure pattern, hysteretic behavior, stiffness degradation and ductility of 4 columns with different proportions through the experiment, the silica fume and recycled hybrid fiber effect on seismic behavior of ordinary recycled concrete columns was studied. The result was shown： compared with ordinary recycled concrete columns, cracking load, yield load and the corresponding displacement were increased slightly with incorporation of a single silica fume. But, the ultimate load and displacement were slightly lower. The indexes of seismic performance of ordinary recycled concrete columns could be effectively improved by adding appropriate recycled hybrid fiber.