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（1 湖南科技大學(xué)土木工程學(xué)院，湘潭 411201； 2 湖南大學(xué)建筑安全與節(jié)能教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410082；3 香港城市大學(xué)，香港 999077）

［摘要］ 在邊界層風(fēng)洞中完成了一系列矩形截面高層建筑1∶500剛性模型的同步測(cè)壓試驗(yàn)。根據(jù)試驗(yàn)結(jié)果研究了高層建筑表面脈動(dòng)風(fēng)壓的概率特性。結(jié)果表明：高層建筑迎風(fēng)面脈動(dòng)風(fēng)壓的概率特性可采用高斯分布來(lái)描述，但側(cè)風(fēng)面、背風(fēng)面均表現(xiàn)出不同程度的非高斯性，側(cè)風(fēng)面氣流分離所形成的剪切層的厚度越大，非高斯性越明顯；基于目標(biāo)概率法，提出了便于工程應(yīng)用的峰值因子的取值方法，隨著保證率的增大，按該方法計(jì)算得到的峰值因子的增大速度比正態(tài)分布峰值因子的增大速度快；對(duì)矩形截面高層建筑，以99.38%作為目標(biāo)概率，極大值峰值因子取2.7；極小值峰值因子在立面中間區(qū)域取3.3，邊緣區(qū)域取3.9。

［關(guān)鍵詞］高層建筑; 風(fēng)洞試驗(yàn); 概率特性; 峰值因子

中圖分類號(hào)：TU312      文獻(xiàn)標(biāo)識(shí)碼：A      文章編號(hào)：1002-848X(2014)10-0089-05

Probability characteristics and peak factor for fluctuating wind pressures on rectangular tall buildings

Li Yonggui1,2, Li Qiusheng2,3

 (1 College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China; 2 Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan University, Changsha 410082, China; 3 City University of Hong Kong, Hong Kong 999077, China)

Abstract: A series of 1∶500 rigid tall building models were used in boundary layer wind tunnel tests for simultaneous pressure measurements. Based on the experimental results, the probability characteristics of the fluctuating wind pressure were analyzed. The results show that a Gaussian distribution is suitable for describing the probability distribution of the windward fluctuating wind pressure, but the kurtosis and skewness show a non-Gaussian behavior of different degree on crosswind side and leeward side. The thicker the shear layer formed by the separation flow is, the more obvious the non-Gaussian behavior is on crosswind side. A method was supposed to determine the peak factor for engineering application based on the target probability method. With the guarantee rate increasing, peak factor determined by the supposed method increases faster than that by Gaussian distribution. Taking 99.38% as a target probability, for rectangular tall buildings, the maximum peak factor is preferable to be 2.7, and the minimum peak factor can be taken as 3.3 in the middle areas of the facades and 3.9 in the edge regions, respectively.

Keywords: tall building; wind tunnel test; probability characteristic; peak factor

*國(guó)家自然科學(xué)基金（51178179）, 國(guó)家自然科學(xué)基金重大研究計(jì)劃（91215302），湖南省自然科學(xué)基金（14JJ6026），交通部西部交通科技項(xiàng)目重大科技專項(xiàng)（2011318824140）。

作者簡(jiǎn)介：李永貴，博士，講師，Email：lyg313@126.com。

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