【摘要】 利用超高性能混凝土(ultra high performance concrete, UHPC)材料特性，提出一种针对预制拼装桥墩的重力灌浆构造，即采用UHPC灌浆并依靠立柱自身重力完成拼接的插槽式连接构造。为研究该形式桥墩的抗震性能，设计完成了三个桥墩的拟静力试验，分别为整体现浇墩Z1、新型插槽式连接墩P1及现有“I型”连接墩P2,并采用OpenSees有限元软件做模拟分析，与试验结果对比分析。结果表明：三个桥墩的破坏形式一致，均为弯曲破坏；Z1墩与P1墩滞回曲线呈梭形，滞回环较为饱满，且相同位移加载循环下的滞回路径较为吻合，P2墩接口处钢筋与混凝土间黏结滑移影响较大，导致滞回环面积减小，桥墩整体滞回耗能能力降低；P1墩的耗能能力较Z1墩和P2墩分别提升7.0%、10.7%,呈现峰值荷载小、失效速率慢、极限位移大、滞回耗能多的骨架趋势。试验结果与有限元模拟结果较为吻合，抗震性能参数差幅在10.0%以内，新型插槽式连接墩可应用于实际工程。更多还原

【Abstract】 Based on the material characteristics of ultra high performance concrete(UHPC), a gravity grouting structure for prefabricated piers was proposed, that is, a slot-type connection structure using UHPC grouting and relying on the gravity of the column to complete the splicing. In order to study the seismic performance of this type of piers, the pseudo-static tests of three piers were designed, namely, the monolithic cast-in-place pier Z1, the new slot type connecting pier P1 and the existing “type I” connecting pier P2, and the finite element software OpenSees was used to simulate and analyze the test results. The results show that the failure forms of the three piers are the same, all of them are bending failure. The hysteretic curves of Z1 and P1 piers are fusiform, the hysteretic loops are relatively full, and the hysteretic paths are more consistent under the same displacement loading cycle. The bonding slip between reinforcement and concrete at the interface of P2 pier has a great influence, resulting in the reduction of the area of the hysteretic loops and the overall hysteretic energy dissipation capacity of the pier. The energy dissipation capacity of P1 pier is 7.0% and 10.7% higher than that of Z1 pier and P2 pier respectively, showing a skeleton trend of small peak load, slow failure rate, large ultimate displacement and high hysteretic energy consumption. The experimental results are in good agreement with the finite element simulation results, and the seismic performance parameter difference is less than 10.0%. The new type of slot pier can be applied to practical engineering.更多还原