摘要
对设有外镂空装饰结构的扭转体型高层建筑的风荷载采用风洞试验方法进行研究,分析扭转体型高层建筑风压和风荷载合力的分布特征,研究装饰结构对主体结构风压分布的影响、装饰结构自身内外表面的风压分布特点,比较有无装饰结构的扭转体型高层建筑风荷载合力。结果表明:扭转体型对主体结构的局部风压和扭矩产生较大的影响,但对主体结构X向和Y向风荷载合力的影响不大;装饰结构对主体结构迎风面和背风面的风压影响较小,但能明显减小主体结构侧风面风压的平均值和脉动效应,使得主体结构的极值负压得到降低,有利于围护结构的抗风设计;装饰结构上同一位置内外表面的平均风压非常接近,合成的净压值很小;装饰结构对于主体结构的平均风荷载影响较小,但降低了主体结构风荷载的脉动效应,对主体结构的抗风有利。
In order to obtain wind loads on a torsion shaped high-rise building with outer pierced ornament structure,wind tunnel testing method was employed.The distribution characteristics of wind pressures and resultant forces on the torsion shaped high-rise building were analyzed.The influence of the ornament structure on wind pressure distribution of the main building was investigated.The wind pressure distribution on the ornament structure itself was also studied.Finally,the resultant forces on the torsion shaped high-rise building with or without the ornament structure were compared.Results show that the torsion shape has significant influences on the local wind pressures and torsional moments of the building and has insignificant influences on the resultant forces in X and Y directions of the building.The ornament structure has insignificant influences on the pressures in the windward and leeward surfaces of the main structure.However,the mean and fluctuating wind loads on the side wind surface of the main structure can be reduced significantly due to the influence of the ornament structure,resulting in a reduction in peak negative pressure which is quite beneficial for wind-resistant design of enclosure structures.The wind pressures on the inner and outer surfaces of the ornament structure are quite close,indicating that the net wind pressures on the ornament structure are very low.Totally speaking,the ornament structure has a insignificant influence on mean wind loads of the main building,but it can reduce the fluctuating wind loads on the main building to some extent.As a result,the wind-resistant design of the main building is beneficial from the existing of the ornament structure.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2013年第6期68-74,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51178425)
关键词
高层建筑
风荷载
风洞试验
扭转
风压
high-rise building
wind load
wind tunnel test
torsional effect
wind pressure
