车桥耦合系统的非线性动力响应分析  

Analysis of the nonlinear dynamic behavior of the bridge under moving load system

作　　者：谭子翼 唐雪松[1] 盛国刚[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《长沙理工大学学报（自然科学版）》2016年第1期49-55,共7页Journal of Changsha University of Science and Technology:Natural Science

基　　金：湖南省自然科学基金资助项目(11JJ3013)

摘　　要：考虑桥面的不平整度和桥梁结构的几何非线性效应,根据达朗贝尔原理,建立了车桥耦合的动力学模型。利用模态分析的方法,得到了耦合系统关于广义坐标的非线性动力学方程。通过龙格-库塔法和Visual Fortran语言编程对方程进行求解,获得了梁桥在移动车辆系统作用下的动力响应曲线及冲击系数曲线,并计算了系统参数变化对桥梁结构非线性动力效应的影响。研究结果显示,桥的跨径、弯曲刚度、车辆速度和不平整度系数等参数发生变化时,非线性对桥梁动力特性的影响程度也将发生变化。Considering the surface irregularities of the bridge and nonlinear influence,according to D＇Alembert＇s principle,the basic dynamic equations of vehicle-bridge interaction system are formulated.With the application of modal analysis method,the nonlinear dynamic equations are deduced using generalized coordinates.By Runge-Kutta methods and Visual Fortran program,the displacement response curves of the beam bridge and the curves of impact effect are obtained.The nonlinear dynamic influence on beam bridges is calculated considering the change of system parameters.According to the results,the nonlinear influence on beam bridges is changed with the change of parameters,including span,flexural stiffness,velocity of vehicle and surface roughness.

关 键 词：梁桥 移动荷载系统 非线性 动力响应 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]