混杂纤维增强高性能混凝土剪力墙性能研究

Research on Behavior of Hybrid Fiber Reinforced High-Performance Concrete Shear Walls

通过9片钢纤维-聚丙烯纤维混杂增强高性能混凝土剪力墙的水平低周反复荷载试验,分析了混杂纤维增强高性能混凝土剪力墙的破坏形态、抗剪强度、滞回特性、延性、耗能和刚度退化等问题。研究结果表明:掺加少量的钢纤维(0.3%)和聚丙烯纤维(0.11%)后,剪力墙的开裂荷载提高了30%左右,使高性能混凝土剪力墙的极限强度提高了40%以上;随着轴压比的增大,剪力墙的极限强度提高显著,但耗能和延性稍许降低。

The experimental study on 9 high-performance steel fiber-polypropylene fiber hybrid reinforced concrete shear walls through low-frequency repeated load testing have been carried out. The damage pattern, shear strength, hysteresis characteristics, ductility, energy dissipation and stiffness degradation and other issues of high-performance hybrid fiber-reinforced concrete shear walls have been analyzed. The results show that： blending a small amount of steel fiber （0.3%） and polypropylene fiber （0.11%） can increase the cracking load of shear walls about 30 %, the ultimate strength of shear walls more than 40 %, as the ratio of axis compressive to the capacity increases, the ultimate strength of shear walls increases significantly, but energy dissipation and ductility slightly decrease.