混杂纤维混凝土柱抗震性能试验研究

Experimental study on seismic behavior of hybrid fiber reinforced concrete columns

设计制作了钢-聚丙烯混杂纤维混凝土柱试件,并对其进行低周反复荷载试验以研究其抗震性能。通过分析破坏现象、破坏形态、滞回曲线、骨架曲线、延性、耗能能力、刚度退化等抗震性能指标,探讨纤维种类、纤维体积掺量对试件各抗震性能指标的影响规律。结果表明:钢-聚丙烯混杂纤维的掺入使得试件滞回曲线更加丰满、捏拢现象减缓,骨架曲线延性平台更为明显,达到峰值荷载后,骨架曲线下降更为缓慢、刚度退化趋缓,塑性变形能力和耗能能力相应增加,柱的抗震性能得到提高。在选取的纤维体积掺量中,钢纤维体积掺量为1.5%时试件的抗震性能最优。

The steel-polypropylene hybrid fiber reinforced concrete colums were designed and manufactured,and the tests were carried out under low reversed cyclic horizontal loads to research its seismic performance.By analyzing the seismic performance indexes such as damage phenomenon,failure mode,hysteresis curve,skeleton curve,ductility,energy dissipation and stiffness degradation,etc,the influence of fiber type and fiber volume content on the seismic performance indicators of the specimen was discussed.Experimental results show that steel-polypropylene hybrid fibers makes the hysteresis curve of the specimen is more plentiful,the pinch is slowed down,the skeleton curve has more obvious ductile platform,the curve decreases more slowly and the stiffness degradation slows down after the peak load,the ability of plastic deformation and energy dissipation increase,thus,the seismic behavior of the column is improved in all aspects.In the selected fiber volume fraction,when the volume fraction of steel fiber is 1.5%,the seismic behavior of the specimen is optimal.