大跨屋盖结构表面风向折减因子研究  

Directionality reduction factor of wind load on long-span roof structures

作　　者：郑星辰 任彧 杨庆山[2,3] Zheng Xingchen;Ren Yu;Yang Qingshan(Fujian Provincial Institute of Architectural Design and Research Co.Ltd,350001,Fuzhou,China;Beijing Key Laboratory of Structural Wind Engineering and Urban Wind Environment,Beijing Jiaotong University,100044,Beijing,China;School of Civil Engineering,Chongqing University,400044,Chongqing,China)

机构地区：[1]福建省建筑设计研究院有限公司,福州350001 [2]北京交通大学结构风工程与城市风环境北京市重点实验室,北京100044 [3]重庆大学土木工程学院,重庆400044

出　　处：《应用力学学报》2019年第6期1340-1347,I0006,I0007,共10页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金重大研究计划集成项目(91215302)

摘　　要：为研究风向对屋盖表面风荷载的折减效应,选取风速检验方法对不同城市的实测风速数据进行了均一性修正;采用不同极值风速理论模型,计算各风向上不同重现期的极值风速,并对比分析了我国不同城市极值风速结果;结合实测风速数据和风洞试验结果,分析了不同屋盖几何特征、风速样本数量对风向折减因子的影响,给出了我国部分城市的风向折减因子。研究结果表明:与基于经典极值理论的Gumbel法相比,基于小容量样本理论的POT法所得的极值风速偏小12%左右;与日本规范相比,美国规范计算所得风向折减因子受屋盖的几何特征影响较大;可根据本文提出的最佳建筑朝向判别标准对结构进行优化设计。In order to study the reduction factor of wind load on roof, different homogeneity tests methods are compared and selected to correct the records of wind speed data in different cities firstly. Secondly, different extreme-value theory models are adopted to calculate extreme wind speed in different wind directions. Results from both methods in different cities are compared. On this basis, the measured data and wind tunnel test results are combined, effect of geometrical character of roof and sample size on the directionality reduction factor are analyzed, and finally, the wind directionality reduction factors of three cities in China are presented. Results show that the maximum wind speed obtained based on small samples theory is about 12% smaller than that from the Gumbel method based on the classical extreme-value theory. Compared with the value obtained by Japanese code, the wind directionality reduction factor is not sensitive to geometrical character by American code. The winddirectionality reduction factors in various cities and optimal building orientations obtained could be used in future structural optimization design.

关 键 词：风向折减因子 风荷载 均一性检验 极值分布 建筑规范 

分 类 号：TU312[建筑科学—结构工程]