考虑气弹效应的超大型冷却塔脉动风压非高斯特性研究
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摘要
设计制作可同步测压测振的超大型冷却塔(高度为200 m)完备气弹模型,获取了考虑气弹效应的表面脉动风荷载,并对脉动风压的非高斯统计特性进行研究。基于测点脉动风压时程及其概率密度分布曲线,对具有非高斯分布特性的局部区域作出判断,再从风压信号的时间空间相关性入手,并结合中心极限定理讨论非高斯风压的形成机理,最后基于高阶矩的斜度及峰态值给出非高斯特征的区域划分和判别标准。
Taking the super large cooling tower(H=200 m) as the example,based on modified equivalent beam-net design method,wind tunnel test of simultaneous pressure and vibration measurement for large cooling towers was carried out firstly.Wind pressure sample and histograms were employed to identify the local regions in which the wind pressure fluctuations exhibit non-Gaussian feature.The reason for non-Gaussian features in separated regions was discussed by combining the analysis of spatial correlation of wind pressure and the central limit theorem.The skewness and kurtosis of fluctuating wind pressures were employed to obtain a description of non-Gaussian features,and the criterions of non-Gaussian were proposed.
Taking the super large cooling tower(H=200 m) as the example,based on modified equivalent beam-net design method,wind tunnel test of simultaneous pressure and vibration measurement for large cooling towers was carried out firstly.Wind pressure sample and histograms were employed to identify the local regions in which the wind pressure fluctuations exhibit non-Gaussian feature.The reason for non-Gaussian features in separated regions was discussed by combining the analysis of spatial correlation of wind pressure and the central limit theorem.The skewness and kurtosis of fluctuating wind pressures were employed to obtain a description of non-Gaussian features,and the criterions of non-Gaussian were proposed.
引文
[1]CHEN Kai,WEI Qingding.Investigation of wind-induced vibration of cooling towers[C]//The Proceedings of11th Structural Wind Engineering Conference.Xi'an,2003:177-182.
[2]张彬乾,李建英,阎文成.超大型双曲冷却塔双塔干扰的风荷载特性研究[J].流体力学试验与测量,2003,17(增刊):93-97.ZHANG Binqian,LI Jianying,YAN Wencheng.Investigation on interrelation of,wind load for double super large hyperbolic cooling tower[J].Experiments and Measurements in Fluid Mechanics,2003,17(S):93-97.
[3]刘若斐,沈国辉,孙炳楠.大型冷却塔风荷载的数值模拟研究[J].工程力学,2006,23(6):177-184.LIU Ruofei,SHEN Guohui,SUN Bingnan.Numerical simulation study of wind load on large hyperbolic cooling tower[J].Engineering Mechanics,2006,23(6):177-184.
[4]Ke S T,Ge Y J,Zhao L,et al.A new methodology for analysis of equivalent static wind loads on super-large cooling towers[J].Journal of Wind Engineering&Industrial Aerodynamics,2012,111(3):30-39.
[5]柯世堂,葛耀君.大型双曲冷却塔表面脉动风压随机特性:非高斯特性研究[J].实验流体力学,2010,24(3):12-18.KE Shitang,GE Yaojun.Research on features of fluctuating wind pressure on large hyperbolic cooling tower:Features of non-gaussian[J].Journal of Experiments in Fluid Mechanics,2010,24(3):12-18.
[6]Zhang J F,Ge Y J,Zhao L.Effect of latitude wind pressure distribution on the load effects of hyperboloidal cooling tower shell[C]//The13th International Conference on Wind Engineering.Amsterdam,Netherlands,2011:326-341.
[7]武际可.大型冷却塔结构分析的回顾与展望[J].力学与实践,1996,18(6):1-5.WU Jike.Review and expectation of structure analysis for large cooling tower[J].Mechanics and Practice,1996,18(6):1-5.
[8]徐华舫.空气动力学基础[M].北京:北京航空学院出版社,1987:124-126.XU Huafang.The basic theory of aerodynamics[M].Beijing:Beijing University of Aerospace Press,1987:124-126.
[9]Gioffre M,Gusella V.Non-Gaussian wind pressure on prismatic buildings[J].Journal of Structural Eingineering,2001,127(9):990-995.
[10]柯世堂,赵林,葛耀君.大型双曲冷却塔气弹模型风洞试验和响应特性[J].建筑结构学报,2010,31(2):61-68.KE Shitang,ZHAO Lin,GE Yaojun.Wind tunnel test on aeroelastic model of large hyperbolic cooling towers and features ofwind2induced response[J].Journal of Building Structure,2010,31(2):61-68.
[11]阎文成,张彬乾,李建英.超大型双曲冷却塔风荷载特性风洞试验研究[J].流体力学试验与测量,2003,17(增刊):85-89.YAN Wencheng,ZHANG Binqian,LI Jianying.Investigation on characteristics of wind load for super large hyperbolic cooling tower in wind tunnel[J].Experiments and Measurements in Fluid Mechanics,2003,17(S):85-89.
[12]柯世堂,赵林,葛耀君,等.超大型冷却塔结构风振与地震作用影响比较[J].哈尔滨工业大学学报,2010,42(10):1635-1641.KE Shitang,ZHAO Lin,GE Yaojun,et al.Comparison of super large cooling towers under earthquake excitation and wind loading[J].Journal of Haerbin Industry University,2010,42(10):1635-1641.
[2]张彬乾,李建英,阎文成.超大型双曲冷却塔双塔干扰的风荷载特性研究[J].流体力学试验与测量,2003,17(增刊):93-97.ZHANG Binqian,LI Jianying,YAN Wencheng.Investigation on interrelation of,wind load for double super large hyperbolic cooling tower[J].Experiments and Measurements in Fluid Mechanics,2003,17(S):93-97.
[3]刘若斐,沈国辉,孙炳楠.大型冷却塔风荷载的数值模拟研究[J].工程力学,2006,23(6):177-184.LIU Ruofei,SHEN Guohui,SUN Bingnan.Numerical simulation study of wind load on large hyperbolic cooling tower[J].Engineering Mechanics,2006,23(6):177-184.
[4]Ke S T,Ge Y J,Zhao L,et al.A new methodology for analysis of equivalent static wind loads on super-large cooling towers[J].Journal of Wind Engineering&Industrial Aerodynamics,2012,111(3):30-39.
[5]柯世堂,葛耀君.大型双曲冷却塔表面脉动风压随机特性:非高斯特性研究[J].实验流体力学,2010,24(3):12-18.KE Shitang,GE Yaojun.Research on features of fluctuating wind pressure on large hyperbolic cooling tower:Features of non-gaussian[J].Journal of Experiments in Fluid Mechanics,2010,24(3):12-18.
[6]Zhang J F,Ge Y J,Zhao L.Effect of latitude wind pressure distribution on the load effects of hyperboloidal cooling tower shell[C]//The13th International Conference on Wind Engineering.Amsterdam,Netherlands,2011:326-341.
[7]武际可.大型冷却塔结构分析的回顾与展望[J].力学与实践,1996,18(6):1-5.WU Jike.Review and expectation of structure analysis for large cooling tower[J].Mechanics and Practice,1996,18(6):1-5.
[8]徐华舫.空气动力学基础[M].北京:北京航空学院出版社,1987:124-126.XU Huafang.The basic theory of aerodynamics[M].Beijing:Beijing University of Aerospace Press,1987:124-126.
[9]Gioffre M,Gusella V.Non-Gaussian wind pressure on prismatic buildings[J].Journal of Structural Eingineering,2001,127(9):990-995.
[10]柯世堂,赵林,葛耀君.大型双曲冷却塔气弹模型风洞试验和响应特性[J].建筑结构学报,2010,31(2):61-68.KE Shitang,ZHAO Lin,GE Yaojun.Wind tunnel test on aeroelastic model of large hyperbolic cooling towers and features ofwind2induced response[J].Journal of Building Structure,2010,31(2):61-68.
[11]阎文成,张彬乾,李建英.超大型双曲冷却塔风荷载特性风洞试验研究[J].流体力学试验与测量,2003,17(增刊):85-89.YAN Wencheng,ZHANG Binqian,LI Jianying.Investigation on characteristics of wind load for super large hyperbolic cooling tower in wind tunnel[J].Experiments and Measurements in Fluid Mechanics,2003,17(S):85-89.
[12]柯世堂,赵林,葛耀君,等.超大型冷却塔结构风振与地震作用影响比较[J].哈尔滨工业大学学报,2010,42(10):1635-1641.KE Shitang,ZHAO Lin,GE Yaojun,et al.Comparison of super large cooling towers under earthquake excitation and wind loading[J].Journal of Haerbin Industry University,2010,42(10):1635-1641.
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