高层结构群风压力分布与干扰效应
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摘要
为研究群风环境中高层结构的风压分布特性与群风干扰效应,采用1:300缩尺刚性模型风洞试验,在24种风向角下分析了高层结构风荷载特性的群风效应,研究了结构的压分布特性与群风干扰效应。结果表明,现有《建筑结构荷载规范》的结构风压设计值不宜用于群风环境中高层结构抗风设计,而模型风洞试验可有效地反映群风环境中的结构风压特性;迎风面与背风面脉动压力系数较侧风面低,最大脉动压力出现在涡旋运动最强烈处,也是最大负压产生处;结构极值风压可以通过脉动风压的概率特性识别,进而对结构采取相应的加强措施。试验研究技术可靠,结果可用于该工程及类似工程的抗风设计参考。
Wind pressure characteristics and interference effect of a high-rise building in group environment were investigated in detail by wind tunnel tests with 1:300 scale rigid model in 24 wind directions.Wind tunnel test was suggested to be adopted to implement reliable structural wind-resistant design in group environment so as to avoid some shortcomings of the "load code for the design of building structures" used nowadays.the resuls show that the fluctuating pressure coefficients on windward and lee sides are generally less than that on sidewind faces because of stronger vortex motion near the sidewind faces.The maximum fluctuating pressure appears where the strongest vortex motion and also the maximum negative pressure appear.Structural extreme wind pressure can be well identified by probabilitstic characteristics of fluctuating wind pressure and then corresponding structure-enhancing measures can be adopted.The technigue used in this paper is reliable and the results can be used as a reference to wind-resistant design of nuclear engineering and other similar projects.
Wind pressure characteristics and interference effect of a high-rise building in group environment were investigated in detail by wind tunnel tests with 1:300 scale rigid model in 24 wind directions.Wind tunnel test was suggested to be adopted to implement reliable structural wind-resistant design in group environment so as to avoid some shortcomings of the "load code for the design of building structures" used nowadays.the resuls show that the fluctuating pressure coefficients on windward and lee sides are generally less than that on sidewind faces because of stronger vortex motion near the sidewind faces.The maximum fluctuating pressure appears where the strongest vortex motion and also the maximum negative pressure appear.Structural extreme wind pressure can be well identified by probabilitstic characteristics of fluctuating wind pressure and then corresponding structure-enhancing measures can be adopted.The technigue used in this paper is reliable and the results can be used as a reference to wind-resistant design of nuclear engineering and other similar projects.
引文
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[2]金新阳,杨易,盛平,等.新广州火车站大跨屋盖结构风荷载风洞试验与数值模拟研究[J].建筑结构,2009,39(12):55-58.JIN Xinyang,YANG Yi,SHENG Ping,et al.Research on wind loads of new Guangzhou railway station by wind tunnel test and numerical simula-tion[J].Building Structure,2009,39(12):55-58.
[3]韩庆华,陈越,曾芯敏等.大跨度球面网桥结构的风振系数研究[J].地震工程与工程振动,2007,27(1):38-45.HAN Qinghua,CHEN Yue,ZENG Xinmin,et al.Analysis of wind-induced vibration coefficient for long-span reticulated dome[J].Journal ofEarthquake Engineering and Engineering Vibration,2007,27(1):38-45.
[4]黄江,关富玲,吴开成.杭州黄龙体育中心网球馆可开启屋盖的风洞试验[J].江南大学学报(自然科学版),2007,6(1):81-85.HUANG Jiang,GUAN Huling,WU Kaicheng.Wind tunnel test for the wind pressure distribution on hangzhou huanglong tennis gymnasium[J].Journal of Southern Yangtze University(Natural Science Edition),2007,6(1):81-85.
[5]鲜荣,廖海黎,李明水.大跨悬挑屋盖风压分布风洞试验分析[J].空气动力学学报,2009,27(5):572-577.XIAN Rong,NI Haili,LI Mingshui.Wind press distribution characteristics analysis of long-span cantilevered curve roof in wind tunnel test[J].Acta Aerodynamic Sinica,2009,27(5):572-577.
[6]裴永忠,寇岩滔,朱丹,沈顺高,顾志福.北京A380机库风洞试验及风振响应分析[J].土木工程学报,2008,41(2):22-28.PEI Yongzhong,KOU Yantao,ZHU Dan,SHEN Shungao,GU Zhihu.Wind tunnel test and wind-induced dynamic of Beijing A380 hangar[J].China Civil Engineering Journal,2008,41(2):22-28.
[7]李朝,李秋胜,黄生洪,等.大跨度复杂屋盖结构风荷载的大涡模拟[C].//第十三届全国结构风工程学术会议论文集.大连:大连理工大学出版社,2007:995-1005.
[8]孙芳锦,张大明,殷志详.膜结构风振中流固耦合效应的数值模拟研究[J].地震工程与工程振动,2010,30(3):136-140.SUN Fangjin,ZHANG Daming,YIN Zhixiang.Numerical simulation of fluid-structure interaction in wind-induced vibration of membrane struc-tures[J].Journal of Earthquake Engineering and Engineering Vibration,2010,30(3):136-140.
[9]李正良,王承启,赵仕兴,等.复杂体型高层建筑风洞试验及数值模拟.土木建筑与环境工程[J],2009,31(5):69-73.LI Zhengliang,WANG Chengqi,ZHAO Shixing,et al.Wind tunnel test and numerical simulation of wind-induced loads on complex-shapedhigh-rise buildings[J].Journal of Civil,Architectural&Environmental Engineering,2009,31(5):69-73.
[10]张耀春,倪振华,王春刚,秦云.高层开洞建筑测压风洞试验[J].建筑结构,2006,36(2):86-90.ZHANG Yaochun,NI Zhenhua,WANG Chungang,QIN Yun.Wind tunnel measuring pressure tests of tall buildings with opening[J].BuildingStructure,2006,36(2):86-90.
[11]丁威.典型断面高层建筑风荷载风洞试验研究[D].大连:大连理工大学,2010.DING Wei.Wind-tunnel experimental researches on wind loads of high-rise buildings with typical section[D].Dalian:Dalian University ofTechnology,2010.
[12]顾明,黄鹏,周晅毅,等.广州新电视塔模型测力风洞试验及风致响应研究I:风洞试验[J].土木工程学报,2009,42(7):8-13.GU Ming,HUANG Peng,ZHOU Hengyi,etc.Wind tunnel force balance test and wind-induced responses of the Guangzhou new TV towerstructure I:wind tunnel test[J].China Civil Engineering Journal,2009,42(7):8-13.
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