低周反复荷载作用下纤维混凝土柱抗震性能有限元分析

采用有限元软件,研究纤维混凝土柱在低周反复荷载作用下的抗震性能,分析纤维掺量对滞回曲线、骨架曲线、承载力以及延性的影响规律,并与试验值作比较.研究结果表明:纤维的加入可提高构件的承载力和抗震耗能能力.一方面单掺钢纤维能显著提高构件的承载力,复掺聚丙烯纤维的构件其承载力相对单掺钢纤维构件略有提高,说明聚丙烯纤维对构件承载力的贡献较小;另一方面单掺钢纤维构件的延性有明显提高,复掺聚丙烯纤维构件的延性相对单掺钢纤维构件略有增大,说明聚丙烯纤维在改善构件的延性方面发挥一定的作用,且钢纤维体积率为1.5%时,构件延性系数最大.

Finite Element Analysis on the Seismic Performance of Fiber Reinforced Concrete Column under Low Cyclic Loading

Seismic behavior of fiber reinforced concrete columns under low cycle loading were studied by finite element analysis software.The influence of fiber content on hysteretic curve, skeleton curve, bearing capacity and ductility was analyzed, which was also compared with the test values.The results show that the bearing capacity and seismic energy dissipation capacity can be improved by the adding fiber.On the one hand, the bearing capacity can be significantly enhanced by just adding steel fiber, but not obviously by adding polypropylene fiber at the same time, which showes a little contribution to the bearing capacity.On the other hand, the ductility, which is a little improved by adding polypropylene fiber and steel fiber, is observably improved by just adding steel fiber.Therefore, the polypropylene fiber plays a certain role in improving the bearing capacity of the component.The bearing capacity coefficient of the components at a rate of 1.5% of steel fiber volume content is the largest.