摘要
基于重复采样风洞试验和概率相关系数检验法,对具有典型参数的球面屋盖和柱面屋盖的气动力效应的不确定性进行了系统研究。着重分析了平均风压系数和脉动风压系数的概率分布特征。研究结果表明:正态分布是平均风压系数的最优分布,球面屋盖、柱面屋盖平均风压的变异系数均值分别为0.11和0.13。对数正态分布为脉动风压系数的最优概率分布,对于球面屋盖,脉动风压系数均值在来流前缘和尾流区较大,最大值出现在屋盖后缘,标准差最大值出现在屋盖左右两侧与来流约成45°的轴线上;对于柱面屋盖,脉动风压系数均值和标准差在屋盖顶部较大,最大值均出现在顶部与两侧墙体连接处。基于风洞试验结果,采用Monte Carlo方法研究了样本数量对平均风压系数抽样误差的影响,定义了与平均风压变异系数和样本数量有关的平均风压调整系数,并给出了具体取值,可为现行风洞试验提供参考。
The aerodynamic effect uncertainties for two kinds of typical large span roofs,a spherical shell and a cylindrical shell were analysed systematically based on repeated wind tunnel tests and the probability plot correlation coefficient method. Probability distribution characteristics of mean wind pressure and fluctuating wind pressure were investigated. The study indicates that normal distribution is the ideal model to describe the probability distribution of mean wind pressure coefficients. The mean value of variation of mean pressure coefficients for the spherical shell and the cylindrical shell are 0. 11 and 0. 13,respectively. Lognormal distribution is the ideal model to describe the probability distribution of fluctuating wind pressure coefficients. For the spherical shell,the mean value of fluctuating pressure coefficients at the leading edge and downwind part are relatively high,and the maximum value occurs at the leeward edge. The maximum value of standard deviation occurs at a 45° angle to the incoming flow. For the cylindrical shell,both the mean value and standard deviation of fluctuating pressure coefficients reach the maximum at the joint area of the rooftop and the side walls. Monte Carlo method is carried out to investigate the influence of sample size on the sampling error of mean wind pressure coefficients. Adjusting factor related to the variation of mean pressure coefficients and sample size is proposed,which will provide references for current wind tunnel tests.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2016年第10期147-153,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51308039
91215302)
关键词
大跨度屋盖
平均风压
脉动风压
风洞试验
不确定性
large span roof
mean wind pressure
fluctuating wind pressure
wind tunnel test
uncertainty
