车辆-高架桥耦合系统竖向振动分析车辆轨道新模型  

A New Track Model for Vertical Vibration Analysis of Vehicle-Ballastless Track-Bridge Coupling

作　　者：罗文俊[1,2] 雷晓燕[2] 练松良[1] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]华东交通大学铁路环境振动与噪声教育部工程研究中心,江西南昌330013

出　　处：《华东交通大学学报》2013年第2期1-8,共8页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(U1134107;51108180);江西省自然科学基金项目(20114BAB212002);江西省教育厅项目(GJJ11118)

摘　　要：针对CRTS Ⅱ型无砟轨道-桥梁轨道结构的特点,建立了列车-无砟轨道-桥梁耦合振动新模型。整个系统离散成一个多节点的轨道单元和具有二系悬挂的动轮单元,基于有限元方法和Lagrange方程,建立列车-无砟轨道-桥梁时变系统竖向振动方程。该模型具有程序编制容易、计算效率高的特点。作为应用实例,计算得出了两车通过时随机不平顺条件下轨道桥梁结构的动力特性,说明新模型正确可行。Based on the structural characteristics of the CRTS II ballastless track-bridge system,a new model of vehicle-track-bridge coupling vibration is presented.The system is firstly separated into driven wheel element and a single＂four layer beam＂element.Then the vertical vibration equation of the vehicle-ballastless track-bridge time-dependent system is established by means of finite element method and Lagrange equation.The proposed model has advantages of convenience for programming and high efficiency for computing.The vertical displacements are obtained by assuming the pure smooth rail.The comparison between the result and reference shows the correctness and feasibility of the new model.As an application,the vibration characteristics of the track bridge structure are calculated under random irregular conditions.

关 键 词：动轮单元 无砟轨道-桥梁单元 动力分析 

分 类 号：U213.2[交通运输工程—道路与铁道工程]