强台风“黑格比”登陆过程中近地风场特性  

Surface layer wind field characteristics during a severe typhoon 'Hagupit' landfalling

作　　者：李秋胜[1,2] 戴益民[1] 李正农[1] 胡尚瑜[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]香港城市大学建筑工程系,香港999077

出　　处：《建筑结构学报》2010年第4期54-61,共8页Journal of Building Structures

基　　金：湖南大学"985"工程;国家自然科学基金重大研究项目(90815030)

摘　　要：为准确研究低矮房屋的风载特性,基于建造在强台风"黑格比"登陆地点的低矮房屋原型实测房,对强台风"黑格比"登陆的全过程进行了监测,获取了在强台风登陆过程中近地风场及实测房屋表面风压的实测数据。通过对台风登陆过程的风速及风向、阵风因子、湍流度、湍流积分尺度和风速谱等参数的分析,研究了强台风"黑格比"登陆时的近地风场特性,同时介绍了实测房屋及测压系统。结果表明:强台风"黑格比"的最大瞬时风速达到56.7/s,10m in最大平均风速为40.2m/s;台风登陆前,风速及风向脉动变化很大;台风登陆后,湍流度及阵风因子明显减小;风速变大,阵风因子与湍流度有减小的趋势;实测风速谱与von Karman谱吻合较好。研究结果将增进对强台风近地风场的理解和认识,可为今后改进低矮房屋的抗风设计提供参考。Based on field measurements of wind effects on a low-rise building,during typhoon Hagupit,the paper presented selected field measured data.The characteristics of wind speed,wind direction,gust factor,turbulence intensity,turbulence scale and spectra were discussed in detail.The measurement arrangements for the wind pressures on the low rise building were also introduced in the paper.The results show that,the instantaneous maximum wind speed was 56.7m/s,10-minitues mean wind speed 40.2m/s.The higher was the wind speed,the lower values were the turbulence intensity and the gust factor.Before Typhoon ＇Hagupit＇ landfalling,the wind speed and wind direction were fluctuated remarkably.After ＇Hagupit＇ landfalling,the turbulence intensity,the gust factor and the turbulence integral length scale became smaller obviously;and the measured wind speed spectra were in good agreement with von Karman spectrum.The outputs of this study are very useful for further understanding of the characteristics of wind field during severe typhoon,it is also expected that the results presented in this paper should be valuable for wind-resistant design of low-rise buildings.

关 键 词：低矮房屋 强台风“黑格比” 实测 风场 风压 

分 类 号：TU375.4[建筑科学—结构工程]