摘要
针对350~400km·h^(-1)高速列车作用于声屏障的脉动风荷载问题,基于三维非稳态的k-ε两方程紊流模型,采用移动网格的数值仿真计算多种车速、多种屏轨距条件下列车通过声屏障区域的动态风场过程,得出声屏障各部位的脉动风荷载时程曲线等各类结果数据及多种参数的影响规律,并与实测资料进行对比分析。结果表明:300~400km·h^(-1)列车脉动风荷载随列车速度的增加而加速增大,与声屏障至线路中心距离呈现近双曲线性反比关系,风压值分布沿声屏障高度呈现底部大、顶部小的规律;理论计算风压值及其与实测列车脉动风荷载时程曲线形状、参数影响规律等均相符较好,部分计算风压量值略大于实测值,原因在于计算中列车及声屏障模型光滑表面的模拟方法忽略了实际粗糙表面的风阻等因素。在仿真与实测的基础上,提出380~400km·h^(-1)高速列车脉动风荷载的最大风压取值建议及广义振动频率范围1.96~4.79Hz等动力设计建议。
Aiming at the problem of the fluctuating wind load acting on the sound barrier caused by G-series high-speed train with the speed of 350~400 km·h-1,based on 3D unsteady k-εtwo-equation turbulence model,the dynamic wind field processes of trains passing sound barrier zone at different speeds with different distances between the sound barrier and track center line were simulated and analyzed by using moving mesh method.The time-history curves of fluctuating wind load on various parts of soundbarrier and the influence laws of various parameters were obtained,and were compared with the measured data.Results show that the fluctuating wind load of train with the speed of 300~400 km·h-1 increases with the increasing of train speed,and presents an approximate hyperbolic inverse relationship with the distance between sound barrier and line center.The distribution of wind pressurevalue along the height of sound barrier shows the law of larger on the bottom and smaller on the top.The wind pressure values obtained by theoretical calculation agree well with the time-history curves of the measured fluctuating wind load and the influence laws of parameters.Some calculated air pressure values areslightly larger than the measured ones.The reason is that the simulation methods of train and sound barrier models with smooth surface ignore the factors suchas the wind resistance of the actual rough surface in calculation.Based on simulation and measured results,the maximum value of the wind pressure caused by G-series high-speed train with the speed of 380~400 km·h-1 is proposed and the dynamic design in the generalized vibration frequency range of 1.96~4.79 Hz is also suggested.
作者
施洲
杨仕力
蒲黔辉
邓跞
SHI Zhou;YANG Shili;PU Qianhui;DENG Luo(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Environmental Engineering Research Institute,China Railway Eryuan Engineering Group Limited Company,Chengdu Sichuan 610031,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2018年第2期103-111,共9页
China Railway Science
基金
国家自然科学基金青年科学基金资助项目(51408496)
关键词
高速铁路
声屏障
列车脉动风荷载
风压值
谱特性
High speed railway
Sound barrier
Fluctuating wind load of train
Wind pressure value
Spectrum characteristics
