| 大跨度平屋面结构的气动抗风措施及其机理分析 |
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| 引用本文： | 傅继阳.大跨度平屋面结构的气动抗风措施及其机理分析[J].暨南大学学报,2007,28(1):79-83. |
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| 作者姓名： | 傅继阳 |
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| 作者单位： | 暨南大学力学与土木工程系,广东,广州,510632 |
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| 基金项目： | 国家自然科学基金
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广东省科技厅科技计划 |
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| 摘 要： | 通过综合一些典型大跨度平屋面结构的风洞试验结果,分析了这种结构风敏感方向的风压分布特征及其产生机理.用频域相干分析法间接地证实了锥形涡的存在,并指出它是造成此类结构角区附近负压显著偏大的主要原因.针对此类结构的风压分布特征,提出了气动抗风措施.试验结果显示它可以干扰锥形涡的形成,大大削减风敏感部位的风荷载值,使平均局部体型系数降低约50%.
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| 关 键 词： | 大跨屋盖 风荷载 相干函数 锥形涡 气动抗风措施 大跨度 平屋面结构 抗风措施 机理分析 mechanism analysis structures roof flat span 体型系数 局部 风荷载 敏感部位 干扰 显示 风洞试验 类结构 负压 结构角 存在 |
| 文章编号： | 1000-9965(2007)01-0079-05 |
| 修稿时间： | 04 3 2006 12:00AM |
Aerodynamic wind-resistance measures of long span cantilevered flat roof structures and their mechanism analysis |
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| FU Ji-yang.Aerodynamic wind-resistance measures of long span cantilevered flat roof structures and their mechanism analysis[J].Journal of Jinan University(Natural Science & Medicine Edition),2007,28(1):79-83. |
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| Authors: | FU Ji-yang |
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| Institution: | Department of Mechanics and Civil Engineering, Jinan University, Guangzhou 510632, China |
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| Abstract: | Some wind tunnel experimental results for typical long span cantilevered flat roof structures are presented in this paper.The largest peak suction values are observed from pressure taps beneath conical "delta-wing type" corner vortices that occur for oblique winds,then the characteristics and causes of the local peak suctions are discussed in detail.Furthermore,it is verified that the peak suctions are highly correlated with the conical vortices by coherence functions of fluctuating pressures.Finally,according to the characteristics of wind loads on the roof,an aerodynamic solution to minimize the peak suctions by venting the leading edges and the corners of the roof is recommended.The experimental results show that the suggested strategy can effectively control the generation of the conical vortices and make a reduction of 50% in mean local shape factors at wind sensitive locations on the roof. |
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| Keywords: | long span roof wind load coherence function conical vortices aerodynamic wind-resistance measure |
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