(湖南科技大学土木工程学院， 湘潭 411201)

［摘要］为研究开洞低矮房屋在台风环境下的破坏机理，基于ANSYS软件采用SST k\|ω湍流模型对低矮房屋封闭、单一洞口的屋面风压分布及变化规律进行数值模拟研究，与全尺模型实测及风洞试验结果对比表明：数值模拟结果与实测及风洞试验结果基本吻合，验证了采用SSTkω湍流模型研究低矮房屋表面风压的可靠性；湍流度对平均内风压系数的影响随开洞位置不同而不同，屋顶开洞时，随着湍流度的增大，平均内风压系数的绝对值变小，屋面平均净风压系数增大；屋沿开洞时，随着湍流度的增大，平均内风压系数的绝对值增大，但平均净风压系数的变化不大；风向角对整体屋面平均内风压系数的影响显著，尤其是在开洞边缘区和迎风角部区域。

［关键词］低矮房屋； 数值模拟； 风致内压； 湍流度； 风向角

中图分类号：TU312+.1     文献标识码：A     文章编号：1002-848X(2015)02-0095-05

Numerical simulation on mean external and internal pressures of lowrise 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 lowrise building roof with openings under the environment of typhoon, the wind pressure distribution and changing law of lowrise building roof with one main opening were studied with turbulence SST kω 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 kω 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:lowrise building; numerical simulation; windinduced internal pressure; turbulence intensity; wind angle

*交通运输部重大科技项目（2011318824140），广西防灾减灾与结构安全重点实验室开放课题（2013ZDK 06），湖南省教育厅（13K088），湖南科技大学项目（E51257，J11216）。

作者简介：戴益民，博士，副教授，Email：dymzzy@163.com。

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