下击暴流作用下高层建筑物表面风压分布特性
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摘要
以CAARC(英联邦航空咨询理事会)高层建筑物标准模型为研究对象,基于计算流体动力学方法研究了下击暴流作用下高层建筑物的表面风压分布特性,并将结果同大气边界层近地风作用下的风压分布特性进行了比较分析.结果表明:下击暴流作用下建筑物模型迎风面风压力最大值位于建筑物的中下部约1/3高度处,不同于近地风作用下的最大值位于建筑物中上部靠近顶部附近;在背风面,下击暴流作用下负压力分布呈下小上大、中间小两侧大的特征,不同于近地风作用下的负压力分布较为均匀、上下端和两侧较大、中间小的分布特性.
Based on computational fluid dynamics(CFD) numerical simulation technique,the downburst-induced mean wind pressure on the Commonwealth Advisory Aeronautical Council(CAARC) standard tall building was predicted.The mean wind pressure distribution characteristics of CAARC standard tall building were analyzed and compared with mean wind pressure distribution characteristics under atmospheric boundary layer wind.The results indicate that the maximum mean wind pressure on windward side is located at about 1/3 of the bottom of the building,which is different from the top part under atmospheric boundary layer wind;on the leeward side,negative wind pressures on top of building under downburst are larger than bottom and the both sides are larger than the middle,while the negative wind pressures is comparatively well distributed under atmospheric boundary layer wind and negative wind pressures on top,bottom and two sides of building are larger than middle.
Based on computational fluid dynamics(CFD) numerical simulation technique,the downburst-induced mean wind pressure on the Commonwealth Advisory Aeronautical Council(CAARC) standard tall building was predicted.The mean wind pressure distribution characteristics of CAARC standard tall building were analyzed and compared with mean wind pressure distribution characteristics under atmospheric boundary layer wind.The results indicate that the maximum mean wind pressure on windward side is located at about 1/3 of the bottom of the building,which is different from the top part under atmospheric boundary layer wind;on the leeward side,negative wind pressures on top of building under downburst are larger than bottom and the both sides are larger than the middle,while the negative wind pressures is comparatively well distributed under atmospheric boundary layer wind and negative wind pressures on top,bottom and two sides of building are larger than middle.
引文
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[2]Proctor F H.Numerical simulations of an isolated mi-croburst,part II:sensitivity experiments[J].Journalof Atmospheric Sciences,1989,46(14):2143-2165.
[3]Letchford C W,Mans C,Chay M T.Thunder-storms—their importance in wind engineering,a casefor the next generation wind tunnel[J].Journal ofWind Engineering and Industrial Aerodynamics,2002,90(12-15):1415-1433
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[5]Holmes J D.Recent developments in the specificationof wind loads on transmission lines[J].Journal ofWind and Engineering,2008,5(1):8-18.
[6]Chay M T,Letchford C W.Pressure distributions ona cube in a simulated thunderstorm downburst,partA:stationary downburst observations[J].Journal ofWind Engineering and Industrial Aerodynamics,2002,90(7):711-732
[7]Letchford C W,Chay M T.Pressure distributions ona cube in a simulated thunderstorm downburst,PartB:moving downburst observations[J].Journal ofWind Engineering and Industrial Aerodynamics,2002,90(7):733-753
[8]Sengupta A,Sarkar P P.Experimental measurementand numerical simulation of an impinging jet with ap-plication to thunderstorm microburst winds[J].Jour-nal of Wind Engineering and Industrial Aerodynam-ics,2008,96(3):345-365
[9]Mason M S,James D L,Letchford C W.Wind pres-sure measurements on a cube subjected to pulsed im-pinging jet flow[J].Wind and Structures,2009,12(1):77-88.
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[11]Kim J,Hangan H,Eric Ho T C.Downburst versusboundary layer induced wind loads for tall buildings[J].Wind and Structures,2007,10(5):481-494.
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[14]潘峰,孙炳楠,楼文娟,等.冲击风作用下大跨屋盖多模态随机风致响应研究[J].空气动力学学报,2008,26(1):119-125.
[15]李宏海,欧进萍.下击暴流作用下建筑物表面风压分布模拟[C]∥第19届全国结构工程学术会议论文集(第Ⅲ册).北京:《工程力学》杂志社,2010:76-80.
[16]汤卓,吕令毅.雷暴冲击风荷载的大涡模拟[J].空气动力学学报,2011,29(1):47-51.
[17]陈勇,崔碧琪,余世策,等.雷暴冲击风作用下球壳型屋面模型风压特性试验研究[J].建筑结构学报,2011,32(8):26-33.
[18]Obasaju E D.Measurement of forces and base over-turning moments on the CAARC tall building modelin a simulated atmospheric boundary layer[J].Jour-nal of Wind Engineering and Industrial Aerodynam-ics,1992,40(2):103-126.
[19]Fluent Inc.FLUENT user's guide,release 6.2[S].Lebanon:[s.n.],2005.
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[21]Vicroy D D.A simple,analytical,asymmetric mi-croburst model for downdraft estimation,NASATechnical Memorandum 104053[R].Washington:NASA,1991.
[22]Wood G S,Kwok K.An empirically derived esti-mate for the mean velocity profile of a thunderstormdownburst[C]∥Proceedings of 7th Australian WindEngineering Society Workshop.Auckland:[s.n.],1998:1224-1226.
[23]Letchford C W,Illidge G.Turbulence and topo-graphic effects in simulated thunderstorm down-drafts by wind tunnel jet[C]∥Proceedings of theTenth International Conference on Wind Engineer-ing.Rotterdam:A.A.Balkema,1999:1907-1912.
[24]Hjelmfelt M R.Structure and life circle of micro-burst outflows observed in Colorado[J].Journal ofApplied Meteorology,1988,27(8):900-927.
[25]Huang Shenghong,Li Q S,Xua Shengli.Numericalevaluation of wind effects on a tall steel building byCFD[J].Journal of Constructional Steel Research,2007,63(5):612-627.
[26]聂少锋,周绪红,周天华,等.CAARC标准高层建筑三维钝体绕流风场数值模拟[J].土木建筑与环境工程,2009,31(6):40-46.
[2]Proctor F H.Numerical simulations of an isolated mi-croburst,part II:sensitivity experiments[J].Journalof Atmospheric Sciences,1989,46(14):2143-2165.
[3]Letchford C W,Mans C,Chay M T.Thunder-storms—their importance in wind engineering,a casefor the next generation wind tunnel[J].Journal ofWind Engineering and Industrial Aerodynamics,2002,90(12-15):1415-1433
[4]Holmes J D,Baker C J,English E C,et al.Windstructure and codification[J].Wind and Structures,2005,8(4):235-250.
[5]Holmes J D.Recent developments in the specificationof wind loads on transmission lines[J].Journal ofWind and Engineering,2008,5(1):8-18.
[6]Chay M T,Letchford C W.Pressure distributions ona cube in a simulated thunderstorm downburst,partA:stationary downburst observations[J].Journal ofWind Engineering and Industrial Aerodynamics,2002,90(7):711-732
[7]Letchford C W,Chay M T.Pressure distributions ona cube in a simulated thunderstorm downburst,PartB:moving downburst observations[J].Journal ofWind Engineering and Industrial Aerodynamics,2002,90(7):733-753
[8]Sengupta A,Sarkar P P.Experimental measurementand numerical simulation of an impinging jet with ap-plication to thunderstorm microburst winds[J].Jour-nal of Wind Engineering and Industrial Aerodynam-ics,2008,96(3):345-365
[9]Mason M S,James D L,Letchford C W.Wind pres-sure measurements on a cube subjected to pulsed im-pinging jet flow[J].Wind and Structures,2009,12(1):77-88.
[10]Chen L,Letchford C W.Parametric study on the a-long-wind response of the CAARC building to down-bursts in the time domain[J].Journal of Wind Engi-neering and Industrial Aerodynamics,2004,92:703-724.
[11]Kim J,Hangan H,Eric Ho T C.Downburst versusboundary layer induced wind loads for tall buildings[J].Wind and Structures,2007,10(5):481-494.
[12]瞿伟廉,吉柏锋,李健群,等.下击暴流风的数值仿真研究[J].地震工程与工程振动,2008,28(5):133-139.
[13]瞿伟廉,吉柏锋,王锦文.基于改进的OBV模型的下击暴流风荷载模拟[J].地震工程与工程振动,2009,29(1):46-152.
[14]潘峰,孙炳楠,楼文娟,等.冲击风作用下大跨屋盖多模态随机风致响应研究[J].空气动力学学报,2008,26(1):119-125.
[15]李宏海,欧进萍.下击暴流作用下建筑物表面风压分布模拟[C]∥第19届全国结构工程学术会议论文集(第Ⅲ册).北京:《工程力学》杂志社,2010:76-80.
[16]汤卓,吕令毅.雷暴冲击风荷载的大涡模拟[J].空气动力学学报,2011,29(1):47-51.
[17]陈勇,崔碧琪,余世策,等.雷暴冲击风作用下球壳型屋面模型风压特性试验研究[J].建筑结构学报,2011,32(8):26-33.
[18]Obasaju E D.Measurement of forces and base over-turning moments on the CAARC tall building modelin a simulated atmospheric boundary layer[J].Jour-nal of Wind Engineering and Industrial Aerodynam-ics,1992,40(2):103-126.
[19]Fluent Inc.FLUENT user's guide,release 6.2[S].Lebanon:[s.n.],2005.
[20]Oseguera R M,Bowles R L.A simple analytic 3-di-mensional downburst model based on boundary layerstagnation flow,NASA Technical Memorandum100632[R].Washington:NASA,1988.
[21]Vicroy D D.A simple,analytical,asymmetric mi-croburst model for downdraft estimation,NASATechnical Memorandum 104053[R].Washington:NASA,1991.
[22]Wood G S,Kwok K.An empirically derived esti-mate for the mean velocity profile of a thunderstormdownburst[C]∥Proceedings of 7th Australian WindEngineering Society Workshop.Auckland:[s.n.],1998:1224-1226.
[23]Letchford C W,Illidge G.Turbulence and topo-graphic effects in simulated thunderstorm down-drafts by wind tunnel jet[C]∥Proceedings of theTenth International Conference on Wind Engineer-ing.Rotterdam:A.A.Balkema,1999:1907-1912.
[24]Hjelmfelt M R.Structure and life circle of micro-burst outflows observed in Colorado[J].Journal ofApplied Meteorology,1988,27(8):900-927.
[25]Huang Shenghong,Li Q S,Xua Shengli.Numericalevaluation of wind effects on a tall steel building byCFD[J].Journal of Constructional Steel Research,2007,63(5):612-627.
[26]聂少锋,周绪红,周天华,等.CAARC标准高层建筑三维钝体绕流风场数值模拟[J].土木建筑与环境工程,2009,31(6):40-46.
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