大跨曲面屋盖脉动风荷载非高斯分布特性试验研究  

EXPERIMENTAL STUDY ON NON-GAUSSIAN DISTRIBUTION CHARACTERISTICS OF FLUCTUATING WIND LOADS ON A LONG-SPAN CURVED ROOF

作　　者：李志国[1] 彭宇轩 秦川 杨雄伟 LI Zhiguo;PENG Yuxuan;QIN Chuan;YANG Xiongwei(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《工业建筑》2021年第7期84-89,106,共7页Industrial Construction

摘　　要：在模拟的大气边界层紊流场中对某机场航站楼进行刚性模型同步测压试验,研究大跨度曲面屋盖脉动风荷载非高斯分布特性及非高斯分布区风荷载峰值因子取值方法。根据屋盖结构表面测点在3个典型风向角下的风压数据,分析了屋盖表面脉动风荷载测试信号的平均风压、脉动风压、斜度值和峰度值分布特性,并对比分析了典型位置测点脉动风荷载概率密度分布曲线与标准高斯分布曲线间的差异,发现不同风向角下受流动分离影响剧烈的屋盖迎风前缘及部分曲面弧度变化较大的位置,测点脉动风荷载的斜度、峰度以及概率密度函数较标准高斯分布出现严重偏离,具有显著的非高斯性,为此采用Hermite矩模型计算该曲面屋盖非高斯分布区域测点的风荷载峰值因子,给出了此类复杂大跨曲面屋盖结构风荷载峰值因子较GB 50009—2012《建筑结构荷载规范》取值更为合理的参考取值。The non-Gaussian distribution characteristics of fluctuating wind loads on a long-span curved roof and the determination method for the peak factor of wind loads in the non-Gaussian distribation region were studied by using synchronous pressure measurement of rigid models in the turbulent flow field simulated atmospheric boundary layers.According to wind pressure data under three typical wind directions,the characteristics of mean wind pressure,fluctuating wind pressure,skewness and kurtosis of fluctuating wind loads on roof surfaces were analyzed,the differences between the probability density function of fluctuating wind loads and standard Gauss distribution curves were also compared.It was found that the skewness,kurtosis and probability density function of wind loads under different wind directions deviated from the standard Gaussian distribution,which had significant non-Gaussianity.Thus,the Hermite moment model was used to calculate the peak factor of wind loads for measured points in non-Gaussian region of curved roof,which provided more reasonable reference values of peak factors of wind loads for the complex long-span curved roof compared to the values of Load Code for the Design of Building Structures(GB 50009-2012).

关 键 词：大跨曲面屋盖 脉动风荷载 非高斯性 峰值因子 风洞试验 

分 类 号：TU312.1[建筑科学—结构工程]