跨座式单轨平移式道岔结构数值仿真分析  

Numerical Simulation Analysis of the Translational Turnout in the Straddle Type Monorail

作　　者：卢明奇[1] 杨庆山[1] 何希和 王恒 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]重庆市轨道交通设计院,重庆250002 [3]北京交通大学机械电子学院,北京100044

出　　处：《中国铁道科学》2012年第1期13-18,共6页China Railway Science

基　　金：国家自然科学基金青年科学基金资助项目(51008013);中央高校基本科研业务费专项资金资助项目(2009JBM060)

摘　　要：根据相关规范给出平移式道岔结构在列车作用下的动力荷载类型及相应计算方法。为减少计算单元的划分数量、提高计算分析效率,提出单元重分法模拟列车移动加载。运用有限元数值仿真方法,对平移式道岔在列车运行过程中的力学行为和结构安全性进行分析。结果表明:列车运行过程中平移式道岔结构在长台车处产生最大应力,其应力比为0.86,梁体挠度小于规范规定的相应限值,说明在列车运行过程中平移式道岔的强度和刚度均能够满足结构安全性要求;长台车上部连接板的边缘处存在较大的集中应力,因此在道岔结构制造和施工过程中,需确保其焊缝连接强度不小于母材强度。The dynamic load types of the translational turnout induced by trains and the relevant calculation methods were given on the basis of the correlative design codes.In order to reduce the distribution number of computational elements and improve the efficiency of calculation and analysis,element redistribution method was suggested to simulate the moving load for trains.By means of finite element numerical simulation method,the mechanical behaviors and structural safety of the translational turnout during train operation were analyzed.Results show that the maximum stress emerges at the long trolley of the translational turnout during trains operation,and its stress ratio is 0.86.The deflection of girder is less than the corresponding limit value defined in the design code.It indicates that both the strength and stiffness of the translational turnout can meet the requirements for structural safety during train operation.Because higher stress concentration exists at the edge of the joint plates on the top of the long trolley,it must be ensured that the strength of the welding in the part should be no less than the strength of the base metal in the process of the manufacture and construction of the turnout structure.

关 键 词：跨座式单轨交通 平移式道岔 强度 刚度 单元重分法 

分 类 号：U23[交通运输工程—道路与铁道工程]