- 摘 要
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(湖南科技大學土木工程學院， 湘潭 411201)
［摘要］為研究開洞低矮房屋在臺風環(huán)境下的破壞機理，基于ANSYS軟件采用SST k\|ω湍流模型對低矮房屋封閉、單一洞口的屋面風壓分布及變化規(guī)律進行數值模擬研究，與全尺模型實測及風洞試驗結果對比表明：數值模擬結果與實測及風洞試驗結果基本吻合，驗證了采用SSTkω湍流模型研究低矮房屋表面風壓的可靠性；湍流度對平均內風壓系數的影響隨開洞位置不同而不同，屋頂開洞時，隨著湍流度的增大，平均內風壓系數的絕對值變小，屋面平均凈風壓系數增大；屋沿開洞時，隨著湍流度的增大，平均內風壓系數的絕對值增大，但平均凈風壓系數的變化不大；風向角對整體屋面平均內風壓系數的影響顯著，尤其是在開洞邊緣區(qū)和迎風角部區(qū)域。
［關鍵詞］低矮房屋； 數值模擬； 風致內壓； 湍流度； 風向角
中圖分類號：TU312+.1 文獻標識碼：A 文章編號：1002-848X(2015)02-0095-05
Numerical simulation on mean external and internal pressures of lowrise building roof with openings
Dai Yimin, Wang Xiangjun, Liu Ye
（School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:In order to investigate the failure mechanism of lowrise building roof with openings under the environment of typhoon, the wind pressure distribution and changing law of lowrise building roof with one main opening were studied with turbulence SST kω model in numerical simulation software ANSYS.
Comparing with the field measurements and wind tunnel test results of full scale model, it is found that the results of numerical simulation agree well with those of field measurements and wind tunnel test. The reliability is verified to use turbulence SST kω model in studying the surface wind pressure of low\|rise buildings. The influence of turbulence intensity on the average internal wind pressure coefficient varies with opening position. If the opening is in top of roof, with increase of turbulence intensity, absolute value of the average internal wind pressure coefficient becomes small and the average net wind pressure coefficient on the roof increases. If the opening is along the roof, with the increase of turbulence intensity, the absolute value of the average internal wind pressure coefficient increases while the little change is in average net wind pressure coefficient. The effect of wind angle on average internal wind pressure coefficient of the overall roof is significant, especially in the opening edge area and upwind corner region.
Keywords:lowrise building; numerical simulation; windinduced internal pressure; turbulence intensity; wind angle
*交通運輸部重大科技項目（2011318824140），廣西防災減災與結構安全重點實驗室開放課題（2013ZDK 06），湖南省教育廳（13K088），湖南科技大學項目（E51257，J11216）。
作者簡介：戴益民，博士，副教授，Email：dymzzy@163.com。
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