碳纳米管混凝土桥墩抗震性能有限元分析

Carbon nanotubes reinforced concrete bridge piers seismic performance of finite element analysis

为了研究碳纳米管混凝土桥墩在低周反复荷载作用下的抗震性能,建立了0.3%最优掺量的碳纳米管混凝土桥墩ABAQUS有限元模型,从滞回曲线、骨架曲线、位移延性系数三个方面与普通混凝土桥墩进行比较。研究结果表明:在低周反复荷载作用下,碳纳米管混凝土桥墩滞回曲线饱满。在相同循环荷载内,碳纳米管混凝土桥墩的承载能力、平均刚度都要高于普通混凝土桥墩,且极限承载能力提高了7.3%,产生的塑性变形较小。碳纳米管混凝土桥墩墩顶处的位移延性系数相比于普通混凝土桥墩提升了11.5%。证明了碳纳米管的掺入,对提升混凝土桥墩的抗震性能有着十分重要的意义。

In order to study the seismic performance of carbon nanotube concrete bridge piers under low-cycle repeated action,an ABAQUS finite element model with 0.3%optimal content of carbon nanotube concrete bridge piers was established.The results in terms of hysteresis curve,skeleton curve,and displacement ductility coefficient are compared with that of ordinary concrete piers.The research results show that the hysteretic curve of the carbon nanotube concrete bridge pier is full under the action of low-cycle repeated loading.Under the same cyclic load,the bearing capacity and average stiffness of carbon nanotube concrete piers are higher than those of ordinary concrete piers,and the ultimate bearing capacity is increased by 7.3%,resulting in less plastic deformation.The displacement ductility coefficient at the top of the carbon nanotube concrete pier is increased by 11.5%compared with that of the ordinary concrete pier.It is proved that the incorporation of carbon nanotubes is of great significance for improving the seismic performance of concrete bridge piers.