波纹状悬挑大跨屋盖的风荷载特性

发布时间：2018-09-16 20:50

【摘要】：采用同步测压风洞试验技术,对相同尺寸的波纹状悬挑屋盖、光滑表面悬挑屋盖风荷载进行了研究,重点讨论了波纹形状对悬挑屋盖风荷载的影响。风压分布云图表明,波纹形状没有改变风荷载的主要作用机制,但加剧了来流在屋盖前缘的分离。通过积分得到了对屋盖主体结构抗风设计起控制作用的弯矩系数,相对于光滑表面悬挑屋盖,最不利风向角下波纹状悬挑屋盖的平均弯矩系数增加23%,脉动弯矩系数增加20%,但波纹形状减缓了脉动风荷载在折算频率0.1~0.2范围内的能量集中。波纹形状对风压极值影响较大,特别是对围护结构抗风设计起控制作用的负压极值,波纹状悬挑屋盖较光滑表面悬挑屋盖增加13%。进行波纹状悬挑屋盖抗风设计时,不考虑波纹形状的影响是不安全的。
[Abstract]:The wind load of corrugated cantilever roof with the same size and smooth surface is studied by using synchronous wind tunnel test technique. The influence of corrugated shape on the wind load of cantilever roof is discussed emphatically. The distribution of wind pressure shows that the corrugated shape does not change the main mechanism of wind load, but it intensifies the separation of incoming flow in the front edge of roof. The bending moment coefficient which can control the wind-resistant design of the main roof structure is obtained by integral, which is relative to the cantilever roof with smooth surface. The average moment coefficient of corrugated cantilever roof increases by 23 and the pulsating moment coefficient increases by 20 at the most unfavorable wind direction angle, but the corrugated shape slows down the energy concentration of the fluctuating wind load in the converted frequency of 0.1 ~ 0.2. The corrugated shape has a great influence on the extreme value of wind pressure, especially the negative pressure extremum which controls the wind resistance of the envelope structure. The corrugated cantilever roof increases by 13% compared with that of the smooth surface cantilever roof. It is not safe to design the wind resistance of corrugated cantilever roof without considering the influence of corrugated shape.
【作者单位】：北京交通大学土木建筑工程学院;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;中国建筑设计研究院;
【基金】：国家自然科学基金项目(51578059,51338001,51378060) 高等学校学科创新引智计划(B13002)
【分类号】：TU393.3

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