低空封闭连廊的表面风压和整体体型系数  

Surface Wind Pressure and Overall Shape Coefficients of Low-elevation Enclosed Skybridge

作　　者：沈国辉[1,2] 韩康辉[1] 刘若斐 余杭聪 林巍 SHEN Guohui;HAN Kanghui;LIU Ruofei;YU Hangcong;LIN Wei(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Centre for Balance Architecture,Zhejiang University,Hangzhou 310028,China;The Architectural Design and Research Institute of Zhejiang University Co.Ltd.,Hangzhou 310028,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]浙江大学平衡建筑研究中心,浙江杭州310028 [3]浙江大学建筑设计研究院有限公司,浙江杭州310028

出　　处：《湖南大学学报（自然科学版）》2024年第5期123-131,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52178511,51838012);浙江省公益技术研究计划项目(LGG21E080009)。

摘　　要：采用刚性模型测压风洞试验研究低空封闭连廊的风压分布和整体体型系数,分析连廊4个表面测点的体型系数和非高斯分布特性,研究连廊整体体型系数随风向角和连廊长度的变化,给出低空封闭连廊的正迎风整体体型系数和角度风分配系数,基于极值分析方法给出连廊的全风向极值风压系数,最后给出连廊抗风设计的建议值.研究表明,低空封闭连廊在正吹情况下背风面的体型系数约为-1.04~-0.86,绝对值均大于规范中方柱的-0.6,导致连廊的整体体型系数大于规范中方柱的1.4,30 m长低空封闭连廊的整体阻力系数为1.61;正吹情况下连廊中间截面的整体体型系数大于其他截面,正吹风向角的整体体型系数大于其他风向角,连廊越长正迎风整体体型系数越大;在正吹情况下,连廊迎风面风压主要为高斯分布,其他表面主要为非高斯分布;给出正迎风整体体型系数和角度风分配系数以用于低空封闭连廊主体结构的抗风设计.Wind tunnel testing is employed to study the wind pressure distribution and wind load on lowelevation enclosed skybridges.The characteristics of shape coefficients and non-Gaussian distributions on the four surfaces of the skybridges are analyzed.The overall shape coefficients of the skybridges concerning wind azimuths and skybridge length are investigated.Then,the windward overall shape coefficients and skewed wind loading distribution factors of low-elevation enclosed skybridges are provided.The peak wind pressure coefficients under all azimuths based on extreme value analysis are given.Finally,recommended values for the wind-resistant design of skybridges are suggested.Results show that the shape coefficients in the leeward side of a low-elevation enclosed skybridge range from-1.04 to-0.86,which are much larger than-0.6 in magnitude specified for the square tall building in the load code.As a result,the overall shape coefficient of the enclosed skybridge is 1.61,which is larger than the 1.4 specified for the square-high building in the load code.In the windward direction,the overall shape coefficient in the middle section is larger than that in the other section.The overall shape coefficient in the windward direction is larger than that in the other azimuths.The longer the skybridge length,the larger the overall shape coefficient.In the windward direction,the pressures on the windward surface present a Gaussian distribution,whereas those on the other three surfaces present a non-Gaussian distribution.The windward overall shape coefficients and skewed wind loading distribution factor are used as references for the main load-resistant design of the enclosed skybridges.

关 键 词：连廊 风洞试验 体型系数 非高斯分布 极值风压系数 

分 类 号：TU312[建筑科学—结构工程]