铁路新型柱-板组合式高墩模拟及地震易损性研究  

Seismic Fragility Study and Simulation of Novel Column-Slab Composite High Pier for Railway

作　　者：王力[1,2] 虞庐松[1] 李子奇[1,2] 王嘉[1] 李健宁 WANG Li;YU Lusong;LI Ziqi;WANG Jia;LI Jianning(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China;Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《中国铁道科学》2022年第6期55-64,共10页China Railway Science

基　　金：甘肃省自然科学基金资助项目(20JR10RA237);中央引导地方科技发展资金项目(22ZY1QA005);甘肃省道路桥梁与地下工程重点实验室开放基金(GSDQ-KF2020-4);兰州交通大学甘肃省重点实验室开放课题(2022055)。

摘　　要：为研究铁路新型柱-板组合式空心高墩的抗震性能,以黄-韩-侯铁路纵目沟特大桥为背景,提出采用多垂直杆元模型模拟柱间板、非线性纤维梁单元模拟墩柱及墩上横梁的新型柱-板组合式高墩的有限元模拟方法,建立全桥非线性有限元模型,并进行增量动力分析;选取墩柱曲率延性比和柱间板最大层间位移角为损伤指标,进行该新型柱-板组合式高墩地震易损性研究。结果表明:新型柱-板组合式高墩有限元模拟方法兼具良好的计算精度和效率;新型柱-板组合式空心高墩在设计、罕遇和极罕遇地震作用下抗震性能良好,柱间板和墩柱沿墩高方向发生损伤的顺序一致,先顶层、再底层,然后中间层;在罕遇地震作用下,柱间板发生轻微破坏和中等破坏的概率分别为93.3%和62.1%,而墩柱基本不损伤,柱间板通过优先损伤耗散地震能量大幅减轻了墩柱的损伤程度;当柱间板遭受严重损伤逐渐退出工作时,结构整体刚度减小、周期延长,能有效抑制墩柱发生严重损伤,保证强震作用下桥梁整体结构的强健性。In order to study the seismic performance of the novel column-slab composite hollow high pier for railway,taking the Zongmugou Grand Bridge on Huangling-Hancheng-Houma Railway as background,the finite element simulation method of the novel column-slab composite high pier adopting the multiple-verticalline-element model to simulate the intercolumn slab and the nonlinear fiber beam element to simulate the pier column and the beam on the pier,is proposed.The full-bridge nonlinear finite element model is established and the incremental dynamic analysis is carried out.The curvature ductility ratio of the pier column and the maximum inter-story drift ratio of the intercolumn slab are selected as the damage indexes to study seismic fragility of the novel column-slab composite high pier.The results show that the proposed finite element simulation method of the novel column-slab composite high pier has merit performance in both calculation accuracy and efficiency.The seismic performance of the novel column-slab composite hollow high pier is good according to under the design and under rare and extremely rare seismic actions.The sequences of damage of the intercolumn slab and pier column along the direction of pier height are consistent-the top layer of the pier first,then the bottom,and finally the middle.Under rare seismic actions,the probabilities of slight and medium damages to the intercolumn slab are 93.3%and 62.1%,respectively.While the pier column largely remains undamaged,the intercolumn slab dissipates the seismic energy through the preferential damage,thus greatly mitigating the extent of damage of the pier column.When the intercolumn slab is seriously damaged and gradually withdraws from working,the overall stiffness of the structure is reduced and the period is prolonged,which effectively restrains the serious damage of the pier column and ensures the robustness of the overall structure under strong seismic action.

关 键 词：柱-板组合式高墩 多垂直杆元模型 地震易损性 曲率延性 层间位移角 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]