桥址场地设计风参数的推算和模拟研究
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摘要
对规范不能涵盖的复杂工程场地山川地形和地貌条件,结构抗风设计需要通过相关研究确定在结构设计基准期内的基本风速,以及合适的大气边界层风剖面形式。基于某工程场地附近气象台站多年的10 min年最大风速统计资料,应用极值Ⅰ型分布,推算了工程场地100 a一遇的年最大基本风速。基于计算流体动力学方法,模拟获得了工程场地周围大范围区域的流动特征,获得了工程场地上的不同位置的大气边界层风场剖面,拟合了项目地点的风剖面指数。相关研究方法和结果能为工程建设提供重要参考。
When designing structures prone to wind loads at complicate terrain,which is not covered by currently design code,the extreme wind speed under design life and wind speed profile at construction site still have to be detered. Based on many years records on yearly extreme wind speeds at weather station near the construction site,the basic wind speed upon 100 years return period is recovered by adopting the Type Ⅰ Extreme value distribution. After perforg large scale range flow field simulation around the construction site,the atmosphere boundary layer wind speed profile at construction site is investigated through computational fluid dynamics,and the exponent factor based on power law for wind speed profile is fitted. The present method and obtained results can provide important information for structure design against wind loading.
When designing structures prone to wind loads at complicate terrain,which is not covered by currently design code,the extreme wind speed under design life and wind speed profile at construction site still have to be detered. Based on many years records on yearly extreme wind speeds at weather station near the construction site,the basic wind speed upon 100 years return period is recovered by adopting the Type Ⅰ Extreme value distribution. After perforg large scale range flow field simulation around the construction site,the atmosphere boundary layer wind speed profile at construction site is investigated through computational fluid dynamics,and the exponent factor based on power law for wind speed profile is fitted. The present method and obtained results can provide important information for structure design against wind loading.
引文
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[2] Simiu,E.,and Scanlan,R. H.. Wind effects on structures[M].Third edition,New York:Wiley interscience,1996.
[3] Simiu,E. and Filliben,J. J.,Statistical analysis of extreme winds,Technical Note No. 868,National Bureau of Standards[S]. Washington,D. C.,1974.
[4]陈正洪,向玉春,杨宏青,等.深圳湾公路大桥设计风速的推算[J].应用气象学,2004,15(2):226-234.
[5]吕美仲,侯志明,周毅,气象动力学[M].北京:气象出版社,2004.
[6](美)Sheldon M. Ross,应用随机过程-概率模型导论[M].北京:人民邮电出版社,2016.
[7]数学手册[M].北京:高等教育出版社,1979.
[8] Yoshihide,T.,Akashi,M.,Ryuichiro,Y.,et al,(2008),AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings[J]. Journal of Wind Engineering and Industrial Aerodynamics,96:1749-1761.
[9]项海帆.现代桥梁抗风理论与实践[M].北京:人民交通出版社,2005.
[10] Fluent 6. 2,Fluent Inc[M]. Lebanon,NH,2004.