考虑防撞墙影响的高速铁路桥梁声屏障及翼缘板上脉动力数值分析  

Numerical Analysis of High-Speed Train Induced Impulsive Pressure on Railway Bridge′s Noise Barrier andIts Flange Plate with Collision-Preventing Wall

作　　者：张继文[1] 吕坚品[1] 涂永明[1] 孔崔巍 葛文杰[1] 

机构地区：[1]东南大学土木工程学院,江苏南京210096

出　　处：《中国铁道科学》2009年第3期27-32,共6页China Railway Science

基　　金：铁道部科技研究开发计划项目(2006Z2007)

摘　　要：以可压缩黏性流体的N-S方程和k—ε双方程湍流模型为基础,考虑防撞墙对空压的影响,采用计算流体力学软件PHOENICS,对高速列车行驶时作用在有防撞墙铁路桥梁声屏障和箱梁翼缘板上的脉动力分布进行数值分析。结果表明,列车车头驶入声屏障、经过声屏障中部区域和驶出声屏障时,声屏障各处脉动力时程曲线形式不同,脉动力沿声屏障高度的分布为先增大后减小,约在1/2声屏障高度处达到最大值;桥梁翼缘板上的脉动力峰值沿横桥向基本呈线性增大至防撞墙处;声屏障和桥梁翼缘板上的脉动力峰值与列车速度的平方呈线性关系。根据分析结果给出了脉动力峰值计算公式以及考虑脉动力的结构设计组合荷载。Based on the N-S equation of compressible viscosity fluid and κ-ε two-equation turbulence model, considering the influence of collision-preventing wall on air-pressure, train induced impulsive pressure on high-speed railway bridge noise barrier and box girder flange was numerically analyzed by transient computational fluid dynamics software PHOENICS. The results show that the time-history curves of train induced impulsive pressure are different at three stages, the power head traveling into, passing and out the noise barrier area. The impulsive pressure increases at first then decreases along the height of noise barrier, and it reaches peak value at 1/2 height of the noise barrier. The peak values of the impulsive pressure linearly increase along the box girder flange plate to the collision-preventing wall, and the peak values are proportional to the square of train speed. Calculation formulas for peak value of the impulsive pressure are given according to the analysis results and load cases including the impulsive pressure are recommended.

关 键 词：箱梁桥 声屏障 翼缘板 脉动力 防撞墙 计算流体力学 空气动力学 高速铁路 

分 类 号：U443.5[建筑科学—桥梁与隧道工程] TU112.594[交通运输工程—道路与铁道工程]