下击暴流作用下双坡屋面建筑风荷载分布特性研究
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摘要
采用RNG k-ε湍流模型模拟下击暴流场,在与已有建筑下击暴流场试验数据进行对比验证的基础上,模拟分析了下击暴流对双坡屋面建筑的风压作用;侧重考虑了建筑处于下击暴流径向最大风速位置(r/D_0=1.0)处,风向与坡角变化及有无挑檐对风压分布的影响。分析结果表明:风向与坡角的变化对表面风压有显著影响,坡角变化时,屋面风荷载体型系数最大增幅达到152.2%;随风向角增大,迎风面总体风荷载体型系数呈显著减小趋势,而背风面的负压绝对值则有较大提高,其系数变化幅度达到120.7%;因风向变化,侧风面风荷载体型系数出现261.4%的增幅;有无挑檐对建筑表面风压也产生影响,但主要表现在迎风面近挑檐区域的风压发生较大改变。
The downburst field is simulated by RNG k-ε turbulence model in this paper. On basis of comparison between simulation and test data of the existing building, the wind pressure effect of downburst on gable roofs building is simulated and analyzed, focused on the influence of roof slope and presence or absence of cornice on wind load distribution in the vicinity of radial location(r/D_0=1.0). The results show that the change of wind direction and slope angle has significant influence on surface wind pressure distribution. For instance the wind load shape coefficient of roof facade increased up to 152.2%, which is affected by the slope angle. As the wind direction angle increases, the total wind load shape coefficient on windward facade decreases significantly, while the negative pressure absolute value on leeward facade greatly increases, with the coefficient of variation reaching to 120.7%. Due to the change of wind direction, wind load shape coefficient will appear increase amplitude of 261.4% in proximity to crosswind facade. Surface wind pressure also has been impacted by the cornice, but the wind pressure mainly changed in the windward of proximity to cornices.
The downburst field is simulated by RNG k-ε turbulence model in this paper. On basis of comparison between simulation and test data of the existing building, the wind pressure effect of downburst on gable roofs building is simulated and analyzed, focused on the influence of roof slope and presence or absence of cornice on wind load distribution in the vicinity of radial location(r/D_0=1.0). The results show that the change of wind direction and slope angle has significant influence on surface wind pressure distribution. For instance the wind load shape coefficient of roof facade increased up to 152.2%, which is affected by the slope angle. As the wind direction angle increases, the total wind load shape coefficient on windward facade decreases significantly, while the negative pressure absolute value on leeward facade greatly increases, with the coefficient of variation reaching to 120.7%. Due to the change of wind direction, wind load shape coefficient will appear increase amplitude of 261.4% in proximity to crosswind facade. Surface wind pressure also has been impacted by the cornice, but the wind pressure mainly changed in the windward of proximity to cornices.
引文
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[13]王辉,邓羊晨,易兵兵,等.湿下击暴流作用下建筑立面雨压分布特性的数值分析[J].应用力学学报,2016,33(1):99-104.(WANGHui,DENG Yangchen,YI Bingbing,et al.Numerical analysis of distribution characteristics of rain pressure on building facade under downburst accompanied with rain[J].Chinese journal of applied mechanics,2016,33(1):99-104(in Chinese)).
[14]ZHANG Y,SARKAR P P,HU H.Comparison of microburst-wind loads on low-rise structures of various geometric shapes[J].Journal of wind engineering&industrial aerodynamics,2014,133:181-190.
[15]王辉,陈水福,唐锦春.低层坡屋面群体建筑表面风压的数值模拟[J].工程力学,2003,20(6):135-140.(WANG Hui,CHEN Shuifu,TANG Jinchun.Numerical simulation of wind pressures on a low-rise building complex with gable roofs[J].Engineering mechanics,2003,20(6):135-140(in Chinese)).
[16]李宏海,欧进萍.下击暴流作用下建筑物表面风压分布模拟[J].工程力学,2011,28(增刊2):147-151.(LI Honghai,OUJinping.Numerical simulation of the wind-induced pressure distribution on building surface in downburst[J].Engineering mechanics,2011,28(S2):147-151(in Chinese)).
[2]陈水福,吕少琳.低层双坡房屋屋面风荷载的数值研究--坡角和高宽比影响的分析[J].浙江大学学报,2006,40(10):1738-1742.(CHEN Shuifu,LüShaolin.Numerical study of wind loads on low-rise gable-roofed building roofs-analysis of roof pitch and height-width ratio effects[J].Journal of Zhejiang university,2006,40(10):1738-1742(in Chinese)).
[3]李宏海.下击暴流时空分布统计与风场特性和结构风荷载实验研究[D].哈尔滨:哈尔滨工业大学,2015.(LIHonghai.Spatio-temporal distribution statistical analysis and experiments of wind field characteristics and wind loads on structures of downburst[D].Harbin:Harbin Institute of Technology,2015(in Chinese)).
[4]赵雅丽,全涌,黄鹏,等.典型双坡屋面风压分布特性风洞试验研究[J].同济大学学报,2010,38(11):1586-1592.(ZHAO Yali,QUANYong,HUANG Peng,et al.Wind tunnel test study on wind pressure on typical gable roofs of low-rise buildings[J].Journal of Tongji university,2010,38(11):1586-1592(in Chinese)).
[5]周绪红,聂少锋,周天华,等.低层双坡屋面建筑三维定常风场的数值模拟[J].工程力学,2010,27(3):19-29.(ZHOU Xuhong,NIEShaofeng,ZHOU Tianhua,et al.Numerical simulation of 3D steady atmospheric flow around low-rise gable roof building[J].Engineering mechanics,2010,27(3):19-29(in Chinese)).
[6]JESSON M,STERLING M,LETCHFORD C,et al.Aerodynamic forces on generic buildings subject to transient,downburst-type winds[J].Journal of wind engineering&industrial aerodynamics,2015,137(137):58-68.
[7]JESSON M,STERLING M,LETCHFORD C,et al.Aerodynamic forces on the roofs of low-,mid-and high-rise buildings subject to transient winds[J].Journal of wind engineering&industrial aerodynamics,2015,143(2):42-49.
[8]汤卓,王兆勇,卓士梅,等.雷暴冲击风作用下双坡屋面风压分布[J].东南大学学报,2014,44(1):168-172.(TANG Zhuo,WANGZhaoyong,ZHUO Shimei,et al.Pressure distribution on gable roofs in thunderstorm downburst[J].Journal of southeast university,2014,44(1):168-172(in Chinese)).
[9]KIM J,HANGAN H.Numerical simulations of impinging jets with application to downburst[J].Journal of wind engineering&industrial aerodynamics,2007,95(4):279-298.
[10]李宏海,欧进萍.我国下击暴流的时空分布特性[J].自然灾害学报,2015,24(6):9-18.(LI Honghai,OU Jinping.Spatio-temporal distribution characteristics of downburst in China[J].Journal of natural disasters,2015,24(6):9-18(in Chinese)).
[11]SENGUPTA A,SARKAR P P.Experimental measurement and numerical simulation of an impinging jet with application to thunderstorm microburst winds[J].Journal of wind engineering&industrial aerodynamics,2008,96(3):345-365.
[12]王辉,曹洪明,陈雨生,等.下击暴流作用下群体高层建筑风压干扰特性的数值分析[J].应用力学学报,2017,34(1):76-81.(WANGHui,CAO Hongming,CHEN Yusheng,et al.Numerical analysis on aerodynamic interference characteristics of wind pressure on high-rise building complex in downburst[J].Chinese journal of applied mechanics,2017,34(1):76-81(in Chinese)).
[13]王辉,邓羊晨,易兵兵,等.湿下击暴流作用下建筑立面雨压分布特性的数值分析[J].应用力学学报,2016,33(1):99-104.(WANGHui,DENG Yangchen,YI Bingbing,et al.Numerical analysis of distribution characteristics of rain pressure on building facade under downburst accompanied with rain[J].Chinese journal of applied mechanics,2016,33(1):99-104(in Chinese)).
[14]ZHANG Y,SARKAR P P,HU H.Comparison of microburst-wind loads on low-rise structures of various geometric shapes[J].Journal of wind engineering&industrial aerodynamics,2014,133:181-190.
[15]王辉,陈水福,唐锦春.低层坡屋面群体建筑表面风压的数值模拟[J].工程力学,2003,20(6):135-140.(WANG Hui,CHEN Shuifu,TANG Jinchun.Numerical simulation of wind pressures on a low-rise building complex with gable roofs[J].Engineering mechanics,2003,20(6):135-140(in Chinese)).
[16]李宏海,欧进萍.下击暴流作用下建筑物表面风压分布模拟[J].工程力学,2011,28(增刊2):147-151.(LI Honghai,OUJinping.Numerical simulation of the wind-induced pressure distribution on building surface in downburst[J].Engineering mechanics,2011,28(S2):147-151(in Chinese)).
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