基于现场实测的大跨度膜结构风场特性分析
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摘要
基于实测数据,对强风作用下某大跨度膜结构进行了近地风场特性、风压特性与非高斯特性分析。该工程对大跨度膜结构进行了多点(21点)同步风压实测,同时进行同步风速风向实测。依靠这些数据得到了平均风速、平均风向、纵向、横向脉动风速、阵风因子、湍流度、风压系数、风压相关性、概率密度分布、高阶特征统计量及功率谱密度等参数。实测数据分析表明:在强风作用下大跨度膜结构膜边缘处的风压呈现出明显非高斯特性,且为峰度值大于3的超高斯随机过程;膜边缘测点上下风压呈负相关;该实测风压中低频成分幅值较大,同时,膜结构各位置所受风荷载连续冲击所隔的时间间隔相似。
In this paper,near-surface wind field characteristics,wind pressure characteristics and nonGaussian characteristics of a long-span membrane structure under strong wind are analyzed based on measured data.The multi-point synchronous wind pressure measurement of the large span membrane structure is carried out in this project.Based on these data,the mean wind speed,the mean wind direction,longitudinal and lateral fluctuating wind velocity,gust factor,turbulence intensity,wind pressure coefficient,wind pressure dependency,probability density distribution,high-order characteristic statistics,power spectral density and other parameters are obtained.The results show that the edge of the membrane has obvious non-Gaussian characteristics under the strong wind,and it is a super-Gaussian process with the kurtosis over three;The up-and-down wind pressure is negatively correlated;The amplitude of the lowfrequency component of the measured wind pressure is larger,and the time interval of continuous impact of wind load on each position of the membrane structure is similar.
In this paper,near-surface wind field characteristics,wind pressure characteristics and nonGaussian characteristics of a long-span membrane structure under strong wind are analyzed based on measured data.The multi-point synchronous wind pressure measurement of the large span membrane structure is carried out in this project.Based on these data,the mean wind speed,the mean wind direction,longitudinal and lateral fluctuating wind velocity,gust factor,turbulence intensity,wind pressure coefficient,wind pressure dependency,probability density distribution,high-order characteristic statistics,power spectral density and other parameters are obtained.The results show that the edge of the membrane has obvious non-Gaussian characteristics under the strong wind,and it is a super-Gaussian process with the kurtosis over three;The up-and-down wind pressure is negatively correlated;The amplitude of the lowfrequency component of the measured wind pressure is larger,and the time interval of continuous impact of wind load on each position of the membrane structure is similar.
引文
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[10]Kumar K S,Stathopoulos T.Wind loads on low building roofs:a stochastic perspective[J].Journal of Structural Engineering,2000,126(8):944-956.
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[2]李锦华,吴春鹏,陈水生.矩形结构非高斯风荷载特性研究[J].振动、测试与诊断,2014,34(5):951-959.Li Jinhua,Wu Chunpeng,Chen Shuisheng.Characteristics of non-Gaussian wind pressures on rectangular structure[J].Journal of Vibration,Measurement&Diagnosis,2014,34(5):951-959.(in Chinese)
[3]Li Qiusheng,Wang Yujin,Li Jiacheng.Monitoring of wind effects on an instrumented low-rise building during the landfall of a severe tropical storm[J].Structural Control&Health Monitoring,2016,24(6):e1917.
[4]汤怀强,梁枢果,王磊,等.武汉证劵大厦表面风压风洞试验与现场实测研究[J].武汉理工大学学报,2014,36(3):88-93.Tang Huaiqiang,Liang Shuguo,Wang Lei,et al.Comparative study of wind tunnel test and field measurements of wind pressure of Wuhan international stock building[J].Journal of Wuhan University of Technology,2014,36(3):88-93.(in Chinese)
[5]Liang Fei,Xian Jiahao,Wang Jianwen.Wind-induced dynamic analysis of rung-shape long-span tensile cable membrane structure[J].Applied Mechanics&Materials,2014,578-579:432-440.
[6]Bartko M,Molleti S,Baskaran A.In situ measurements of wind pressures on low slope membrane roofs[J].Journal of Wind Engineering&Industrial Aerodynamics,2016,153:78-91.
[7]李兆杨,杨彬,张其林,等.良态风作用下索膜结构风压特性现场实测研究[J].施工技术,2016,45(11):102-107.Li Zhaoyang,Yang Bin,Zhang Qilin,et al.Field measurement research on wind pressure characteristics of a cable-membrane structure during normal wind[J].Construction Technology,2016,45(11):102-107.(in Chinese)
[8]张志宏,刘中华,董石麟.强/台风作用下大跨空间索桁体系现场风压风振实测研究[J].上海师范大学学报:自然科学版,2013,42(5):546-550.Zhang Zhihong,Liu Zhonghua,Dong Shilin.Field measurement of wind pressure and wind-induced vibration of large-span spatial cable-truss system under strong wind or typhoon[J].Journal of Shanghai Normal University:Natural Sciences,2013,42(5):546-550.(in Chinese)
[9]李利孝,郑斌,肖仪清,等.考虑结构尺寸效应的台风场阵风因子特性分析[J].振动工程学报,2016,29(1):177-183.Li Lixiao,Zheng Bin,Xiao Yiqing,et al.Characteristics of gust factors considering the structural size effect in typhoon wind field[J].Journal of Vibration Engineering,2016,29(1):177-183.(in Chinese)
[10]Kumar K S,Stathopoulos T.Wind loads on low building roofs:a stochastic perspective[J].Journal of Structural Engineering,2000,126(8):944-956.
[11]庞加斌,朱乐东,陈伟.大面积屋顶上下表面脉动风压的相关性分析[J].同济大学学报:自然科学版,2001(5):626-630.Pang Jiabin,Zhu Ledong,Chen Wei.Fluctuating pressure correlativity analyxix between up and down surfaces of large roof[J].Journal of Tongji University:Natural Science,2001(5):626-630.(in Chinese)