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灌浆套筒和预应力筋连接的预制拼装桥墩的抗震性能

葛继平 闫兴非 王志强

葛继平,闫兴非,王志强.灌浆套筒和预应力筋连接的预制拼装桥墩的抗震性能[J].交通运输工程学报,2018,18(02):42-52.
引用本文: 葛继平,闫兴非,王志强.灌浆套筒和预应力筋连接的预制拼装桥墩的抗震性能[J].交通运输工程学报,2018,18(02):42-52.
GE Ji-ping,YAN Xing-fei,WANG Zhi-qiang.Seismic performance of prefabricated assembled pier with grouted sleeve and prestressed reinforcements[J].Journal of Traffic and Transportation Engineering,2018,18(02):42-52.
Citation: GE Ji-ping,YAN Xing-fei,WANG Zhi-qiang.Seismic performance of prefabricated assembled pier with grouted sleeve and prestressed reinforcements[J].Journal of Traffic and Transportation Engineering,2018,18(02):42-52.

灌浆套筒和预应力筋连接的预制拼装桥墩的抗震性能

基金项目: 国家自然科学基金项目(51408360); 上海市科委工程技术研究中心建设项目(17DZ2251900)
详细信息
    作者简介:

    葛继平(1979-),男,江苏海安人,上海应用技术大学副教授,工学博士,从事预制拼装桥墩抗震研究。

  • 中图分类号: U443.22

Seismic performance of prefabricated assembled pier with grouted sleeve and prestressed reinforcements

  • 摘要: 针对轨道交通预制拼装桥墩的受力特点,提出了采用灌浆套筒和预应力筋连接的拼装方案; 设计了3种不同类型桥墩,包括整体现浇试件(RC)、预应力钢绞线和灌浆套筒连接的预制拼装试件(PCSS)与精轧螺纹钢筋和灌浆套筒连接的预制拼装试件(PCTS),采用拟静力试验方法分析了各种桥墩的各种拟静力指标,比较了桥墩的抗震性能。试验结果表明:PCSS和PCTS试件的各指标非常接近,最大误差为2.2%; 灌浆套筒会使传统塑性铰区上移至套筒顶部,说明灌浆套筒对传统塑性铰区域具有局部增强作用,建议对塑性铰的箍筋加密区高度应额外增加1个套筒高度; 采用预应力筋使试件的混凝土轴压力增大了1倍,相应的开裂荷载也增大了约1倍; PCSS试件的屈服荷载和极限荷载正负向均值比RC试件分别提高了31%和34%,等效屈服位移、极限位移和偏移率均值分别比RC试件提高了17%、13%、13%,但是PCSS试件的延性系数平均降低了10%; 在偏移率为6%时,PCSS试件的残余位移均值是RC试件的61%,显示了较好的自复位能力; 与RC试件相比,PCSS试件的刚度提高了13%。相比于精轧螺纹钢筋,钢绞线可以适当弯曲与成束,面积调整灵活,因此,采用无黏结预应力筋和灌浆套筒连接的桥墩试件具有良好的使用性能和抗震性能,可作为预制拼装轨道桥墩的推荐方案。

     

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  • 收稿日期:  2017-11-03
  • 刊出日期:  2018-05-20

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