新型三柱式预制拼装桥墩抗震性能研究  

Seismic Performance of New-Type Precast Segmental Three-Column Pier

作　　者：张利斌 袁红伟 鲁金鹏 袁海蛟 ZHANG Libin;YUAN Hongwei;LU Jinpeng;YUAN Haijiao(CCCC-SHEC Sixth Engineering Co.,Ltd.,Xi′an 710075,China)

机构地区：[1]中交二公局第六工程有限公司,陕西西安710075

出　　处：《桥梁建设》2024年第5期110-115,共6页Bridge Construction

摘　　要：针对传统三柱式预制拼装桥墩(等同现浇)自复位能力不足的情况,提出一种中墩节点采用灌浆波纹管与承台连接(等同现浇)、两边墩节点采用预应力筋与承台连接(可摇摆)的新型三柱式预制拼装桥墩(预制墩)构造。该新型桥墩的中墩灌浆波纹管连接构造在控制地震作用下结构变形的同时可耗散地震能量;边墩预应力连接构造可提供摇摆能力,从而减小桥墩残余变形、提升桥墩自复位能力,对能量耗散起辅助作用。分别建立设置、不设置耗能钢筋的新型三柱式预制墩及传统三柱式预制墩有限元模型进行抗震计算,对比分析滞回曲线、骨架曲线、耗能能力、残余位移、破坏现象等关键抗震性能。结果表明:与传统三柱式预制墩相比,不设置耗能钢筋的新型三柱式预制墩的延性较好,但耗能能力较差,残余位移小;设置耗能钢筋的新型三柱式预制墩的延性好,耗能能力与传统三柱式预制墩基本相当,残余位移较小,抗震性能更优。This study presents a new-type precast segmental three-column pier,which has better self-centering capacity than the conventional precast segmental three-column pier(equating a cast-in-place pier).The center column of the new-type three-column pier is connected with the pile cap via a grouted corrugated pipe(similar to a cast-in-place connection),while the other two columns are connected with the pile caps via prestressing tendons(similar to a rocking connection).The grouted corrugated pipe connection at the center column can control the structural deformation during a seismic event,and at the same time dissipate seismic energy.The prestress connections at the side columns allow the piers to rock under seismic forces,so as to reduce the residual deformation and enhance the self-centering capacity of the piers,and assist seismic energy dissipation.Finite element models of the new-type three-column pier with and without energy-dissipating reinforcement as well as a conventional three-column pier were established for seismic calculation.Key seismic performance indicators are analyzed,including the hysteresis curves,skeleton curves,energy dissipation capacity,residual displacements,failure phenomena.It is demonstrated that compared with the conventional three-column pier,the new-type three-column pier without energy-dissipating reinforcement exhibits better ductility,but poor energy dissipation capacity and small residual displacements.The new-type three-column pier with energy-dissipating reinforcement displays sound ductility,similar energy dissipation capacity to the conventional three-column pier,and small residual displacements,indicating superior seismic performance.

关 键 词：预制拼装桥墩 三柱式桥墩 灌浆波纹管 耗能钢筋 抗震性能 有限元法 

分 类 号：U443.22[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]