- 摘 要
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(1 湖南科技大學(xué)結(jié)構(gòu)抗風(fēng)與振動(dòng)控制湖南省重點(diǎn)實(shí)驗(yàn)室， 湘潭 411201；2 湖南科技大學(xué)土木工程學(xué)院， 湘潭 411201)
［摘要］采用縮尺比為1[DK]∶20風(fēng)洞試驗(yàn)剛性模型，以風(fēng)向角及坡角為變量，針對雙坡低矮建筑屋面易損區(qū)極值風(fēng)壓特性展開風(fēng)洞試驗(yàn)研究?；陲L(fēng)壓時(shí)程概率密度、偏度及峰度，對低矮建筑屋面風(fēng)壓高斯區(qū)與非高斯區(qū)劃分進(jìn)行了研究。采用Wang法、Quan法及峰值因子法對比分析了屋面風(fēng)壓極值估計(jì)誤差，并研究了低矮建筑屋面迎風(fēng)屋檐、屋脊及角部局部區(qū)域的分區(qū)陣風(fēng)系數(shù)變化規(guī)律。結(jié)果表明：屋面坡角影響屋面風(fēng)壓高斯與非高斯分布明顯。Wang法較適用于低矮建筑屋面風(fēng)壓極值估計(jì)。風(fēng)向角對45°坡角屋面局部風(fēng)壓陣風(fēng)系數(shù)影響較明顯。9-6°，30°坡角房屋局部區(qū)域陣風(fēng)系數(shù)規(guī)范取值明顯小于試驗(yàn)值。
［關(guān)鍵詞］低矮建筑； 極值風(fēng)壓； 偏度； 峰度； 陣風(fēng)系數(shù)
中圖分類號(hào)：TU312-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)01-0122-08
Experimental study on extreme wind pressure characteristic on gable roof vulnerable zone of low-rise building
Gao Yang1,2, Dai Yimin1,2, Song Siji1,2, Tao Lin1,2
(1 Hunan Key Laboratory of Wind Resistant and Vibration Control of Structures, Hunan University of Science and Technology, Xiangtan 411201, China; 2 School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China)
Abstract:A rigid wind tunnel test model with a scaling ratio of 1:20 was adopted, and the wind direction angle and slope angle were taken as variables to conduct a wind tunnel test study on the extreme wind pressure characteristics of the vulnerable zone of the gable roof of the low building. Based on the time-history probability density, skewness and kurtosis of wind pressure, the division of gaussian region and non-gaussian region of wind pressure on the roofs of low buildings were studied. The Wang method, Quan method and peak factor method were used to compare and analyze the estimation error of roof wind pressure extreme value, and the variation law of regional gust coefficient in local areas of windward eaves, ridges and corners of the low-rise building was studied. The results show that the roof slope angle obviously affects the gaussian and non-gaussian distribution of roof wind pressure. Wang method is more suitable for estimating the extreme wind pressure of the low-rise building roof. Wind direction angle has obvious influence on local wind pressure gust coefficient of 45° slope angle roof. The code values of the gust coefficients of the local area of the 9-6° and 30° slope angle roofs of the building are obviously smaller than the test values.
Keywords:low-rise building; extreme wind pressure; skewness; kurtosis; gust coefficient
*國家自然科學(xué)基金項(xiàng)目(51578237）。
通訊作者：戴益民，博士，教授，Email：617275190@qq.com。
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