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（湖南科技大學風工程研究中心， 湘潭 411201）
［摘要］采用縮尺比為1∶20的雙坡屋面低矮房屋風洞試驗剛性模型，以湍流積分尺度為變量，研究湍流積分尺度影響低矮房屋屋面局部區(qū)域平均、脈動、極值風壓分布特征和變化規(guī)律。研究發(fā)現(xiàn)，湍流積分尺度的改變對平均風壓系數(shù)影響不明顯，對脈動、極值風壓系數(shù)影響較大,且隨湍流積分尺度的增大，屋面測點脈動、極值風壓系數(shù)絕對值增大。當來流垂直于屋面長邊時，在迎風屋面，距迎風屋檐越遠,平均風壓系數(shù)絕對值越小，山墻和角部區(qū)域脈動風壓系數(shù)越小，而迎風屋面中心區(qū)域脈動風壓系數(shù)越大。在背風屋面，遠離屋脊測點的平均、脈動風壓系數(shù)絕對值逐漸越小。雙坡屋面低矮房屋在迎風屋檐及山墻區(qū)域風壓相對較大，這些局部區(qū)域在強風作用下更易受到破壞。
［關(guān)鍵詞］湍流積分尺度； 雙坡屋面； 低矮房屋； 風壓系數(shù)； 風洞試驗
中圖分類號：TU312-1文獻標識碼：A文章編號：1002-848X(2019)14-0131-05
Wind tunnel test research of wind pressures on roof of low-rise building under turbulence integral scale
Xu De， Dai Yimin， Yang Mengchang， Yu Youliang， Li Yonggui， Li Shouke
(The Wind Engineering Research Center of Hunan University of Science and Technology, Xiangtan 411201, China)
Abstract:A rigid wind tunnel test model of low-rise buildings with double slope roofs with scale ratio of 1:20 was used to study the influence of turbulence integral scale on the local average, fluctuation and extreme wind pressure distribution characteristics and variation law of low-rise buildings. It is found that the change of turbulence integral scale has no obvious effect on the average wind pressure coefficient, but has great influence on the fluctuation and extreme wind pressure coefficient. With the increase of turbulence integral scale, the absolute values of the fluctuation and extreme wind pressure coefficient of roof measurement points increase. When the inflow is perpendicular to the long side of the roof, the farther away from the windward roof, the smaller the absolute value of the average wind pressure coefficient, the smaller the fluctuating wind pressure coefficient in the gables and corners, and the larger the fluctuating wind pressure coefficient in the central area of the windward roof. On the leeward roof, the mean and absolute values of fluctuating wind pressure coefficients, which are far away from the roof, are gradually smaller. Low-rise buildings with double slope roofs have relatively high wind pressure along windward roofs and gable areas, which are more vulnerable to damage under strong wind.
Keywords:turbulence integral scale; double slope roof; low-rise building; wind pressure coefficient; wind tunnel test
*國家自然科學基金(51578237),國家自然科學基金青年科學基金項目(51508184,51508183)。
作者簡介：許德，碩士研究生， Email:xudhust@163.com。
