初始预应力对节段拼装空心桥墩抗震性能影响试验研究  

Experimental Research on Influence of Initial Prestress on Seismic Performance of Precast Segmental Column

作　　者：刘少乾 吴涤 金郑禄 李科 LIU Shaoqian;WU Di;JIN Zhenglu;LI Ke(Sichuan Highway Planning,Survey,Design and Research Institute Ltd,Chengdu 610041;Xinjiang Transportation Planning Survey and Design Institute Ltd,Urumqi 83006)

机构地区：[1]四川省公路规划勘察设计研究院有限公司,成都610041 [2]新疆交通规划勘察设计研究院有限公司,乌鲁木齐830006

出　　处：《公路交通技术》2023年第3期83-89,95,共8页Technology of Highway and Transport

基　　金：四川省交通运输科技项目(2017-A-07)。

摘　　要：为探究初始预应力对采用无粘结预应力连接方式的节段拼装混凝土桥墩抗震性能的影响,采用拟静力试验对2组预应力引起轴压比分别为0.075和0.150的模型试件,在循环荷载作用下的破坏模式、滞回曲线、骨架曲线、延性性能、残余位移、刚度退化、预应力损失、耗能能力等指标进行了对比分析。结果表明:1)2组试件破坏模式均为弯曲破坏;2)初始预应力水平的提高有助于降低试件的预应力损失,同时也会降低其延性性能和残余位移,但基本不会对试件的刚度退化和耗能能力产生影响,不建议通过提高初始预应力的方式提高侧向承载能力。In order to explore the influence of initial prestress on the seismic performance of the precast segmental column with unbounded prestressed connections,a quasi-static experiment is carried out on two pairs of speciemens whose axial compression ratio are 0.075 and 0.150 respectively caused by prestress.The failure mode,hysteretic curve,skeleton curve,ductility,residual displacement,stiffness degradation,prestress loss and energy dissipation capacity are compared and analyzed in detail.The results show that the failure mode of the specimens are bending failure.The increase of initial prestress level is helpful to reduce the prestress loss.Although it reduces the ductility and residual displacement,it has no effect on the stiffness degradation and energy dissipation capacity of the specimen.It is not recommended to increase the lateral bearing capacity by increasing the initial post-tensioning forces.

关 键 词：预拉力 节段拼装 桥墩 拟静力 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]