中文摘要：

建筑结构抗风设计中相当多地区的设计风速,往往参考当地气象观测到的雷暴冲击风的最大风速值,但雷暴冲击风的风场与目前抗风设计采用的大气边界层流场相差悬殊,使得设计风速与设计风场并不匹配。本文将在CFD计算结果与已有文献资料进行比较以验证CFD计算模型及参数准确性的基础上,进行了风场特性的全面研究,主要通过改变冲击风描述参数,来研究雷暴冲击风水平风速及竖向风速的分布特性变化情况,研究成果较为完整的描述了冲击风风场特性。最后提出了用于结构抗风设计的水平风速及竖向风速经验模型,较为简明地反映了雷暴冲击风三维风速的空间分布情况,并得到了CFD模拟、实测以及试验结果的验证。该经验模型为雷暴冲击风下的抗风设计计算提供了理论基础。

英文摘要：

Designing wind velocity in many regions used for structural wind resistance design,usually adopt the maximum wind velocity in a thunderstorm downburst.Nevertheless wind velocities profile caused by downburst differs significantly from codes guided aero boundary layer winds,which leads to that design wind velocity doesn＇t match wind field.After verification of exactness of CFD results by comparing with scaled and full scale experimental results,detailed research was conducted.Studies on both horizontal and vertical wind velocity profiles,varying with different thunderstorm downbursts factors,were accomplished,and the detailed characteristics of downbursts wind filed were approached.Finally the empirical models of horizontal and vertical wind velocity were established,and it describes the space distribution of three dimensional wind velocity,and verified by the CFD simulations,experimental and field test results.These model also give a solid theory foundation for structural thunderstorm downburst wind resisting design.