建筑造型对悬挑屋盖风荷载的影响

Effect of Architectural Surfaces on Wind Load of Cantilever Roof

通过同步测压刚性模型风洞试验,对设置不同建筑造型悬挑屋盖的风荷载特性进行了研究,讨论了肋条高度、波纹间距对该类屋盖风荷载的影响.结果表明:在所选参数范围内,肋条高度对悬挑屋盖风荷载的作用机制影响不大,但当来流与屋盖波纹呈一定夹角时,波纹间距将在一定程度上改变屋盖波纹部分风压的作用机制,该部分风压功率谱及屋盖正压达最大时的风向角均发生变化.肋条高度对悬挑屋盖最不利负压(0°风向角)影响很小,但随着屋盖肋条高度的增加,屋盖最大正压(110°风向角)逐渐减小.最不利负压工况(0°风向角)时,屋盖平底、波纹部分风压均对波纹间距不敏感,最不利正压工况(130°风向角)时,随着波纹间距的增加,屋盖平底、波纹部分风压均减小,尤其是波纹部分.

High-Frequency-Pressure-Integration tests were carried out in a wind tunnel by using rigid models to investigate the effects of architectural surfaces on the wind load acting on the cantilever roof,with emphasis on the height of ribs and the space of waves.The test results show that in the range of the selected parameters in this paper,the height of ribs doesn＇t change the mechanism of wind load,but the space of wave affects the mechanism to some extent when inflow and waves are intersected,resulting in the variations of the PSD of wind load and the wind direction of the maximum wind pressure case.When the height of ribs increases,the maximum wind suction keeps the same（wind direction is 0°）,but the maximum wind pressure decreases（wind direction is 110°）.When the space of waves increase,the maximum wind suction also keeps the same（wind direction is 0°）,but the maximum wind pressure deduces（wind direction is 130°）,especially on the part of wave.