桁段有限元法分析钢桁梁桥振动  

Analysis of steel truss girder bridge vibrations by finite truss element method

作　　者：杨仕若[1] 曾庆元[2] 

机构地区：[1]中南林业科技大学土木工程与力学学院,长沙410004 [2]中南大学土木建筑学院,长沙410075

出　　处：《深圳大学学报（理工版）》2011年第3期195-199,共5页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(50078006);湖南省自然科学基金资助项目(07JJ6098)~~

摘　　要：将列车-钢桁梁桥作为整体振动系统,钢桁梁桥采用桁段有限元法离散,列车采用具有23个自由度的二系弹簧车辆空间振动模型,得到系统振动的矩阵方程.以桥上实测蛇形波作为激振源,分别计算了旅客列车以80、100和120 km/h,货物列车以60和80 km/h车速通过某连续梁桥时车桥系统的振动响应,与传统有限元法相比,桁段有限元法能更好地处理钢桁梁桥中的桥门架单元.对某3×64 m连续梁桥的车桥振动进行分析表明,其Sperling指标、脱轨系数和减载率均在安全行车范围内,行车安全有保障,舒适度和车辆平稳性指标均达合格以上.The train and the continuous truss girder bridge were taken as one composite system.The steel truss bridge was discretized by the finite truss element method,and the train was treated by the two-stage suspension vehicle space dynamic model with 23 degrees of freedom.The measured hunting curves of bogie were taken as excitation,and the vibration responses of train and bridge were calculated when passenger train past through a continuous truss girder bridge at 80 km/h,100 km/h,and 120 km/h,and goods train past through the bridge at 60 km/h and 80 km/h.Compared with the traditional finite element method,finite truss element method can deal better with the bridge frame units of steel truss bridges.The analysical results of a 3×64 m continuous truss bridge show that the Sperling index,derailment coefficients,and unloading rates are within safety range.The transportation safety is guaranteed,and comfort level and vehicle smoothness index meet the requirements.

关 键 词：桥梁工程 有限元 振动方程 车桥系统 刚度 舒适度指标 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]