轨道结构建模精细化程度对高速铁路连续梁桥地震易损性的影响  

THE EFFECTS OF MODEL REFINEMENT OF BALLASTLESS TRACKS ON THE SEISMIC VULNERABILITY OF A CONTINUOUS BRIDGE ON A HIGH-SPEED RAILWAY

作　　者：魏标[1,2] 杨添涵 蒋丽忠 WEI Biao;YANG Tian-han;JIANG Li-zhong(Department of Civil Engineering,Central South University,Hunan,Changsha 410075,China;National Engineering Laboratory for High Speed Railway Construction,Hunan,Changsha 410075,China;China Railway Siyuan Survey and Design Group Co.Ltd,Hubei,Wuhan 430063,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]高速铁路建造技术国家工程实验室,湖南长沙410004 [3]中铁第四勘察设计院集团有限公司,湖北武汉430063

出　　处：《工程力学》2018年第4期16-23,51,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51778635;51778630);中南大学战略先导专项(2016CSU001);新建成都至兰州铁路试验段(成都至川主寺段)工程试验项目(CLRQT-2015-010);中铁二院铁路桥梁减震卡榫及新型防落梁装置研究项目(科2016-38)

摘　　要：为探究CRTS II板式无砟轨道结构建模精细化程度对高速铁路连续梁桥地震易损性曲线的影响,以一座48 m+80 m+48 m高速铁路预应力混凝土连续梁桥为例,采用有限元分析软件Open SEES分别建立四个轨道结构建模精细化程度不同的线桥一体化模型,进行了非线性时程分析和易损性分析,构造了桥梁各关键构件和轨道结构各部件的易损性曲线。计算结果表明,在建立轨道-桥梁一体化模型研究高铁连续梁桥抗震性能时,轨道结构建模精细化程度对滑动层的地震易损性曲线影响很大。随着轨道结构建模的精细化程度降低,滑动层发生地震破坏的概率变大。同时,轨道结构建模越简单,滑动支座发生破坏的概率略微增加,桥墩发生破坏的概率略微减小。此外,轨道结构建模的精细化程度对CA层、扣件、桩基等构件的地震易损性曲线基本上没有影响。By taking a high-speed railway prestressed concrete continuous girder bridge with spans of 48 m+80 m+48 m as an example,the effects of the model refinement of ballastless tracks on the seismic vulnerability were analyzed.The software OpenSEES is used to build four track-bridge models with different model refinement levels of the ballastless tracks.A large number of vulnerability curves of the bridge and track components were obtained.The results show that the seismic vulnerability curves of the sliding layer are greatly influenced by the model refinement of track structure.As the model refinement of track structures is reduced,the failure probability of the sliding layer increases,while it has less influence on the vulnerability curves of the sliding bearing and the pier.Similarly,the sliding bearings are a little more vulnerable with the less refined ballastless track model.On the contrary,the piers are a little less vulnerable.In addition,the model refinement of track structures has feeble influence on the seismic vulnerability curves of the CA layer,fasteners,piles and other components.

关 键 词：高速铁路 连续梁桥 CRTSII型板 抗震 精细化模型 易损性曲线 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]