钢纤维混凝土节段拼装空心墩拟静力试验

Quasi-static Experiments on Steel Fiber Reinforced Concrete Segmental Piers with Rectangular Hollow Section

为探究钢纤维对自密实混凝土桥墩抗震性能的影响,在剪力键干接方式下,对钢纤维混凝土预应力节段拼装空心桥墩试件进行拟静力试验,详细描述试验现象及破坏过程,基于滞回曲线、接缝张角及预应力等测试数据,分析桥墩模型的承载能力、延性性能、残余位移、预应力损失、墩底曲率、耗能能力、刚度退化等性能参数,结果表明:与普通混凝土预应力节段拼装空心桥墩相比,钢纤维可明显提高桥墩的极限承载力、极限位移和位移延性,减小残余位移、预应力损失和混凝土损伤程度,使节段拼装空心桥墩的抗震性能得到综合提升,其机理在于钢纤维能同时增强混凝土的强度和延性。

In order to explore the influence of steel fiber on the seismic performance of self compacting concrete piers,the quasi-static experiment is carried out on the steel fiber reinforced concrete segmental piers with hollow section under the shear key dry connection mode.The phenomenon and failure process are described in detail.Based on the experiment data of hysteretic curve,joint angle and prestress,the bearing capacity,ductility performance and residual position of the pier model,displacement,prestress loss,curvature of pier bottom,energy dissipation capacity,stiffness degradation and other performance parameters are analyzed.The results show that the steel fiber can significantly improve the ultimate bearing capacity,ultimate displacement and displacement ductility of the pier,reduce the residual displacement,prestress loss and concrete damage degree,so that the seismic performance of the hollow pier can be improved comprehensively.The mechanism is that the steel fiber can enhance the strength and ductility of the concrete at the same time.