高烈度地震区高铁多跨简支梁桥纵向倒塌模式研究  

Research on longitudinal collapse mode of multi-span simply-supported beam bridges of high-speed railway in high intensity seismic zone

作　　者：刘尊稳[1,2] 梁刚毅 陈兴冲[1] 邓永杰 李欣婧 LIU Zunwen;LIANG Gangyi;CHEN Xingchong;DENG Yongjie;LI Xinjing(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 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：《振动工程学报》2025年第3期579-586,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(52178142);甘肃省自然科学基金资助项目(21JR1RA240)。

摘　　要：为明确高铁多跨简支梁桥倒塌模式,以中国西北地区10跨高铁简支梁桥为实际工程背景,结合桥上双块式无砟轨道结构特点,建立轨-桥一体化计算模型。采用显式积分法与能量法研究该类无砟轨道桥梁在高烈度地震区的纵向倒塌模式。结果表明:高铁多跨简支梁桥破坏的关键部位主要集中在桥梁伸缩缝处的轨道区域、支座及支座接触面的混凝土区域、桥墩墩底区域;确定了10跨高铁简支梁桥倒塌判别的能量比值为89.33%;通过将桥梁伸缩缝处的轨道板与凹槽截面耦合连接,将结构体系进行优化,提高了轨道与桥梁连结的整体性,避免桥梁伸缩缝处轨道在地震初期成为桥梁破坏的关键部位,结构体系抗倒塌时间延长了约45%,减小了落梁概率,提高了桥梁的整体抗倒塌能力。In order to clarify the collapse mode of multi-span simply-supported beam bridges of high-speed railway,a 10-span highspeed railway simply-supported beam bridge in northwest China is taken as the actual engineering background.Combined with the characteristics of double block ballastless track structure on the bridge,the track-bridge integration research model is established.The collapse mode of this kind of ballastless track bridge in high intensity earthquake zone is studied by using explicit integral method and energy method.The results show that the key parts of the destruction of high-speed railway multi-span simply-supported beam bridge mainly concentrate on the track area of the bridge expansion joint,the concrete area of the support and the support contact surface,and the bottom area of the pier.The energy ratio of the 10-span high-speed railway simply-supported beam bridge collapse discrimination is 89.33%.By coupling the track plate and the groove section at the bridge expansion joint to optimize the structural system,the integrity of the track and bridge connection is improved,so that the track at the bridge expansion joint avoids becoming the key part of the destruction at the early stage of the earthquake.The collapse time of structural system is prolonged by about 45%,and the probability of the beam falling is reduced,so that the overall collapse resistance ability of the bridge is improved.

关 键 词：双块式无砟轨道简支梁桥 纵向倒塌模式 高烈度地震区 显式积分法 能量法 

分 类 号：U448.13[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]