高速列车过站时高架站房楼盖表面风压分析

Analysis of Wind Pressure on the Surface of the Elevated Station Building when the High-speed Train Passes through the Station

研究目的:大跨度高架站房结构向着更轻、更柔的趋势发展,高速列车气动力所引起的站房结构表面风压变化是站房抗风设计中不可忽视的重要因素。为了探究高速列车通过大跨度高架站房结构时楼盖表面的风压特性,采用CFD数值模拟,基于Fluent动网格技术,对时速350 km的高速列车以单、双线运行形式通过大跨度高架站房时楼盖表面的风压特性展开数值模拟仿真研究,分析楼盖表面风压的时程特性及其空间分布特性。研究结论:(1)与高速列车单线运行相比,双线列车跨中交会运行时所产生的列车风叠加效应对楼盖底面风压幅值有显著影响;(2)相较于列车单线运行的工况,列车交会运行时跨中区域各测点的头波正、负风压极值均有较大程度增加,其中测点正、负风压极值的最小增幅都有62.30%和64.36%;(3)本研究结果可为进一步优化大跨度车站结构的抗风设计提供参考。

Research purposes:Due to the lighter and more flexible development in the long-span elevated high-speed railway station,it shows more sensitive to the wind pressure changes of the station structure surface generated by aerodynamic force of high-speed trains.In order to explore the wind pressure characteristics of the floor surface when the high-speed trains pass through the long-span elevated station structure,the Fluent dynamic grid and CFD numerical simulation technology was used to analyze the wind pressure characteristics of long-span elevated station's floor surface with the high-speed train running at 350 km per hour in the form of single and double tracks.Both the time-history characteristics and spatial distribution characteristics of the wind pressure on the floor surface were studied.Research conclusions:(1)The superimposed effect of the train wind on the floor surface has a significant effect on the wind pressure amplitude of the floor surface when the double-track train runs in mid-span intersection compared with the single-track high-speed train.(2)Compared with the single-track running condition,the positive and negative wind pressure extreme values of the head wave at each measuring point in the mid-span area increased to a greater extent,and the minimum increases of the positive and negative wind pressure extreme values of the measuring point were 62.30%and 64.36%.(3)The research results can provide a reference for further optimization of wind resistance design of long-span station structures.