沿海高聳結(jié)構(gòu)臺風(fēng)風(fēng)壓高度變化系數(shù)取值初探
沈之容1，李孫偉2，倪陽3
- 摘 要
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（1 同濟(jì)大學(xué)建筑工程系, 上海 200092； 2 西安大略大學(xué)土木與環(huán)境工程學(xué)院, 安大略省N6G 5B9；3 華東電力設(shè)計院，上海 200001）［摘要］ 臺風(fēng)邊界層風(fēng)場特性是決定受臺風(fēng)影響較大的沿海地區(qū)高聳結(jié)構(gòu)風(fēng)荷載取值的一個主要因素。實(shí)際觀測到的臺風(fēng)邊界層風(fēng)剖線和《建筑結(jié)構(gòu)荷載規(guī)范》（GB 50009—2012）中冪函數(shù)律或?qū)?shù)律所描述的風(fēng)剖線有一定的差別。通過利用下放探空對臺風(fēng)邊界層風(fēng)場的測量數(shù)據(jù)（1997~2010年），在已有的臺風(fēng)風(fēng)剖線模型的基礎(chǔ)上，擬合了下放探空實(shí)測的風(fēng)速數(shù)據(jù)并和荷載規(guī)范中的冪函數(shù)律或?qū)?shù)律所計算的風(fēng)剖線進(jìn)行了比較，對比結(jié)果表明：荷載規(guī)范的計算方法在一定的臺風(fēng)條件下，在100～250m范圍內(nèi)低估了風(fēng)速的高度變化，造成在臺風(fēng)風(fēng)荷載作用下，離海岸較近的高聳結(jié)構(gòu)(100m以上)按荷載規(guī)范計算的風(fēng)荷載值會偏小。［關(guān)鍵詞］臺風(fēng)風(fēng)荷載; 高聳結(jié)構(gòu); 下放探空; 平均風(fēng)剖線; 風(fēng)壓高度變化系數(shù)中圖分類號：TU312+.1 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)24-0084-05Study on hurricane height variation factor of wind pressure of coastal high-rise structuresShen Zhirong1, Li Sunwei2, Ni Yang3（1 Department of Building Engineering, Tongji University, Shanghai 200092, China; 2 Department of Civil and Environmental Engineering, University of Western Ontario, OntarioN6G 5B9, Canada; 3 East China Electric Power Design Institute, Shanghai 200001, China）Abstract: Wind property of the hurricane boundary layer is one of the key factors in determining wind loads acted on high-rise structures in coastal hurricane-prone regions. The wind profile described by the conventionally used power law or log law in the Load code for the design of building structures（GB 50009—2012）is noticeably different from that implied by observations established in the hurricane boundary layer. By using the dropsonde measurement data gathered during 1997~2010 years, the wind velocity data of dropsonde measurement was fitted based on existing wind profile model. Fitted wind velocity data is compared with that calculated by power law or log law in the code. Results show that the calculating method of the code underestimates the wind velocity height variation within 100～250m under certain hurricane wind conditions, which leads to smaller wind load value acted on coastal high-rise structures above 100m when the code calculating method is used.Keywords: hurricane wind load; high-rise structure; dropsonde; mean wind profile; height variation factor of wind pressure作者簡介：沈之容，博士，副教授，Email：shenzhirong@#edu.cn。參考文獻(xiàn)［1］徐旭,劉玉. 高聳結(jié)構(gòu)在臺風(fēng)作用下的動力響應(yīng)分析［J］.建筑結(jié)構(gòu)，2009，39（6）:105-109.［2］葛耀君, 趙林, 項海帆. 基于極值風(fēng)速預(yù)測的臺風(fēng)數(shù)值模型評述［J］.自然災(zāi)害學(xué)報，2003，12（3）：31-40.［3］趙林,朱樂東,葛耀君. 上海地區(qū)臺風(fēng)風(fēng)特性Monte-Carlo隨機(jī)模擬研究［J］.空氣動力學(xué)學(xué)報，2009，27（1）:25-31.［4］GB 50009—2012 建筑結(jié)構(gòu)荷載規(guī)范［S］. 北京：中國建筑工業(yè)出版社，2012.［5］FRANKLIN J L, BLACK M L, KRYSTAL V. GPS dropwindsonde wind profiles in hurricanes and their operational implications.［J］. Weather & Forecasting,2003，18:32-44.［6］HOCK T F, FRANKLIN J L. The NCAR GPS dropwindsonde ［J］. Bulletin of the American Meterological Society, 1999，80:407-420.［7］POWELL M D, VICKERY P J, REINHOLD T A. Reduced drag coefficient for high wind speed in tropical cyclone［J］. Nature, 2003， 422:279-283.［8］VICKERY P J, WADHERA D, POWELL M D, et al. A hurricane boundary layer and wind field model for use in engineering application［J］.Journal of Applied Meteorology and Climatology, 2009, 48:381-405.［9］KEPERT J. The dynamic of boundary layer jet with in tropical cyclone, Part I: linear theory ［J］. Journal of the Atmospheric Sciences，2001, 58:2469-2484.［10］ZHANG J, DRENNAN W M, BLACK P G, et al. Turbulence structure of the hurricane boundary layer between the outer rain bands ［J］. Journal of the Atmospheric Sciences, 2009，66:2455-2467.［11］ZHANG J, ROGERS R F, NOLAN D S, et al. On the characteristic height scales of the hurricane boundary layer［J］. Monthly Weather Review, 2011，139:2523-2535.
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