UHPC连接预制拼装桥墩拟静力试验  

Quasi-Static Test on Precast Bridge Piers with UHPC Connection

作　　者：段昕智 徐文靖 李建中[3] DUAN Xinzhing;XU Wenjing;LI Jianzhong(Shanghai Municipal Planning and Design Institute(Group)Co.,Ltd.,Shanghai 200031,China;Shanghai Urban Road Ecological Engineering Technology Research Center,Shanghai 200031,China;State Key Lab of Disaster Reduction in Civil En gineering,Tongji University,Shanghai 200092,China)

机构地区：[1]上海市市政规划设计研究院有限公司,上海200031 [2]上海城市路域生态工程技术研究中心,上海200031 [3]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《结构工程师》2022年第3期75-82,F0004,共9页Structural Engineers

摘　　要：为了解超高性能混凝土(UHPC)连接预制拼装桥墩在往复荷载作用下的受力性能,本文设计和制作了整体现浇桥墩和UHPC连接预制拼装桥墩大比例尺缩尺模型,开展了水平方向拟静力试验,研究了试件破坏模式、滞回特性、骨架曲线、残余位移和刚度退化等性能,并将UHPC连接的预制拼装桥墩与整体现浇桥墩进行了比较分析。拟静力试验结果表明,UHPC连接的预制拼装桥墩和整体现浇桥墩的破坏形态均为立柱墩底扩大段上方的等截面处弯曲破坏,墩底连接段无明显损伤。在水平往复荷载作用下,UHPC连接预制拼装桥墩的耗能能力、极限承载力和残余变形等均接近整体现浇桥墩,各项指标相差均在15%以内,试件具有较好的抗震性能。本文研究结果可以为UHPC连接预制拼装桥墩在实际桥梁工程中的设计和应用提供试验基础和参考价值。In order to study the mechanical performance of the precast bridge piers with UHPC connection under cyclic loading,two large-scale specimens including the cast-in-place(CIP)pier and the precast bridge pier with UHPC connection were designed and built.The failure modes,hysteresis characteristics,skeleton curves,residual displacement and degeneration of stiffness for these two specimens were discussed in quasistatic test.The results show that the failure modes of the two specimens are both bending failure at the standard cross-section above the enlarged section of the column bottom,and there is no obvious damage to the connecting section of the column bottom.Under cyclic loading,the energy dissipation capacity,ultimate bearing capacity and residual deformation of the precast bridge pier with UHPC connection are close to those of CIP pier,and the difference of each index is within 15%and the specimens appear good seismic performance These results are valuable experimental basis for the design and application of UHPC connecting precast bridge piers in realistic bridge engineering.

关 键 词：桥梁工程 预制拼装 UHPC 拟静力试验 抗震性能 

分 类 号：U446.1[建筑科学—桥梁与隧道工程]