均匀流场中圆角方形断面极值风压系数试验研究  

Experimental Study on Extreme Wind Pressure Coefficient of Square Prism with Rounded Corners in Uniform Flow

作　　者：高佳文 田学东 杨群 刘小兵[1,2,3] Gao Jiawen;Tian Xuedong;Yang Qun;Liu Xiaobing(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043 [3]河北省风工程和风能利用工程技术创新中心,河北石家庄050043

出　　处：《石家庄铁道大学学报（自然科学版）》2022年第4期8-13,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金(52008273,52078313);河北省自然科学基金(E2020210083)。

摘　　要：通过刚性模型测压风洞试验,在均匀流场中研究了雷诺数Re=1.2×10^(5)、圆角率为0.1、0.2、0.3、0.4时的圆角方形断面在不同风向角下的脉动风压非高斯特性。结果发现,圆角方形断面也存在比较明显的非高斯特性。对不同模型表面风压时程进行分析,将峰值因子概率密度曲线进行拟合,并选取保证率为99.38%时的取值。基于以上结果,分析了不同圆角率时极值风压系数随风向角的变化规律,并得到风向角统计意义下的极值风压系数。结果表明,圆角方形断面的极值风压系数分布与圆角率密切相关。Non-Gaussian characteristics of pressure fluctuation on square prisms with rounded corner ratio 0.1,0.2,0.3 and 0.4 were tested through rigid model pressure-measured wind tunnel tests in uniform flow when the Reynolds number was 1.2×10^(5).The results showed that the square prisms with rounded corners also had obvious non-Gaussian characteristics.The research analyzed the time history of wind pressure on the surface of different models,fitted the probability density curve of peak factor,and selected the value when the assurance rate is 99.38%.Based on the above results,the variation of the extreme wind pressure coefficient with the wind direction angles at different rounded corner ratios was analyzed,and the extreme wind pressure coefficient in the statistical sense of the wind direction angle was obtained.The results show that the distribution of the extreme wind pressure coefficient of the square prism with rounded corners is closely related to the rounded corner ratios.

关 键 词：圆角方形断面 圆角率 非高斯特性 极值风压系数 风洞试验 

分 类 号：TU973[建筑科学—结构工程]