Dynamics of wind-rail vehicle-bridge systems
Dynamics of wind-rail vehicle-bridge systems
复制标题
DOI：
10.1016/j.jweia.2005.04.001
复制
发表时间：
2005-06-01
影响因子：
4.8
通讯作者：
Xu, YL
中科院分区：
文献类型：
--
作者：
Li, YL;Qiang, SZ;Xu, YL
将风、轨道车辆和桥梁作为一个耦合振动系统，建立了风-车-桥系统的时域动力学分析模型。该分析模型考虑了风与桥梁的流固耦合、车辆与桥梁的接触、随机风激励、车辆运动对系统的时间依赖性、桥面车辆风荷载对系统的影响等问题。建立了风、车辆和桥梁的模型，采用简化的谱表示法模拟风速脉动，车辆模型为质量-弹簧-阻尼系统，桥梁模型为有限元模型。风与桥梁之间的相互作用与大跨度桥梁传统抖振分析中考虑的相互作用相似。针对桥面上行驶车辆气动力系数测量困难的问题，采用余弦法则计算行驶车辆的气动力系数，考虑偏航角的影响，推导出行驶车辆所受风荷载的表达式，以供工程应用。为了考虑风荷载的相互影响，采用组合截面模型试验和专门设计的试验装置，分别测量了车辆和桥面的气动参数。车辆与桥梁之间的动力相互作用取决于车辆车轮与桥面钢轨之间的几何和力学关系。推导了耦合WVB系统的运动方程，并采用非线性迭代法求解。最后，以我国某斜拉桥为例，分析了WVB体系的动力相互作用。结果表明了本模型的有效性以及风对轨道车辆和桥梁的影响。(c)2005爱思唯尔有限公司保留所有权利。
An analytical model for dynamics of wind-vehicle-bridge (WVB) systems is presented in this paper in the time domain with wind, rail vehicles and bridge modeled as a coupled vibration system. The analytical model considers many special issues in a WVB system, which include fluid-solid interaction between wind and bridge, solid contact between vehicles and bridge, stochastic wind excitation oil vehicles and bridge, time dependence of the system due to vehicle movement, and effect of bridge deck oil vehicle wind load and vice versa. The models of wind, vehicles and bridge are presented with wind Velocity fluctuations simulated Using the simplified spectral representation method, with vehicles modeled as mass-spring-damper systems, and with bridge represented by a finite element model. The interactions between wind and bridge are similar to those considered in conventional buffeting analysis for long span bridges. In considering difficulties in measuring aerodynamic coefficients of moving vehicles on bridge deck, the Cosine Rule is adopted for the aerodynamic coefficients of moving vehicles to consider yaw angle effect, and expressions of wind forces on moving vehicles are then derived for engineering application. To include mutual effects of wind loads, aerodynamic parameters of vehicles and bridge deck are measured, respectively, using a composite section model test and a specially designed test device. The dynamic interaction between vehicle and bridge depends oil both geometric and mechanical relationships between wheels of vehicles and rails oil the bridge deck. The equations of motion of the coupled WVB system are derived and solved with a nonlinear iterative procedure. A cable-stayed bridge in China is finally selected as a numerical example to demonstrate dynamic interaction of the WVB system. The results show the validity of the present model as well as wind effects on the rail vehicles and the bridge. (c) 2005 Elsevier Ltd. All rights reserved.