场地条件对高速铁路桥梁-轨道系统震后残余变形的影响  

Influence of site conditions on post-earthquake residual deformation of high-speed railway bridge-track system

作　　者：余建 周旺保[1,2] 蒋丽忠[1,2] 刘祥 冯玉林 YU Jian;ZHOU Wangbao;JIANG Lizhong;LIU Xiang;FENG Yulin(School of Civil Engineering,Central South University,Changsha 410075,China;National Engineering Research Center of High-speed Railway Construction Technology,Central South University,Changsha 410075,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中南大学高速铁路建造技术国家工程研究中心,湖南长沙410075 [3]福建工程学院土木工程学院,福建福州350118 [4]华东交通大学土木建筑学院,江西南昌330013

出　　处：《中南大学学报（自然科学版）》2023年第5期1823-1838,共16页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51408449,51778630,52078487);湖南省创新型省级建设项目(2019RS3009);中南大学创新驱动项目(502501006);中南大学中央高校基本科研业务费专项(2022ZZTS0150);高速铁路建造技术国家工程研究中心开放基金资助项目(HSR202202)。

摘　　要：以带CRTSⅡ型板式无砟轨道结构的高速铁路多跨简支梁为研究对象,分析高速铁路桥梁-轨道系统震后残余变形的分布规律,提出一种描述震后残余变形的特征曲线,比较在不同地震强度下场地条件对震后残余变形的影响。研究结果表明:在横向地震作用下,支座发生了严重的横向变形,箱梁发生了明显的横向偏移,其余构件没有发生损伤;在纵向地震作用下,各构件没有发生损伤;多遇地震作用后,高速铁路桥梁-轨道系统无需修复,震后高速列车运行无需减速;在设计地震和罕遇地震作用后,支座需要更换,震后高速列车运行需要减速;随着土体柔软程度的提升,震后残余变形的幅值明显增加;地震作用后当高速列车由坚硬场地行驶至柔软场地时,需要适当减速。Taking a multi-span simply supported beam with CRTS Ⅱ slab ballastless track as research object,the distribution law of post-earthquake residual deformation was analyzed.A characteristic curve to describe the postearthquake residual deformation was proposed.The influence of site conditions on post-earthquake residual deformation under different earthquake intensities conditions was compared.The results show that under the action of transverse earthquake,bearings suffer serious transverse deformation,and girders undergo obvious transverse displacement,while the other components keep intact.Under the action of longitudinal earthquake,all the components keep intact.After frequent earthquakes,high-speed railway bridge-track system does not need to be repaired,and high-speed train does not need to slow down after earthquakes.After fortification earthquakes and rare earthquakes,bearing needs to be replaced and high-speed train needs to slow down.With the increase of site softness,the post-earthquake residual deformation increases significantly.High-speed train needs to slow down properly when driving from hard site to soft site.

关 键 词：桥梁工程 高速铁路 演化功率谱密度 短时傅里叶变换 地震残余变形 场地条件 

分 类 号：U24[交通运输工程—道路与铁道工程]