摘要
基于两栋角对角布置、横截面复杂的实际超高层建筑的刚性模型测压风洞试验数据,分析了综合体型系数以及风压系数分布特性,详细讨论了建筑间的气动干扰机理。研究结果表明,两栋塔楼在气流方向上串列布置时,其间可能产生恒定的旋涡,使得上游建筑背风面和下游建筑迎风面的平均风压都表现为较高的负压,上游建筑的平均风荷载会大大超过单体建筑的情况;两栋塔楼在气流方向上大致并列布置时,建筑两侧可能产生周期性的旋涡脱落,导致横风向响应的均方根值较大。此外,建筑的等效静力风荷载以平均风荷载为主,且建筑的自由振动频率远远大于气动力的卓越频率,脉动风荷载以背景分量为主而共振分量较小,这使得结构刚度的增加无法显著降低建筑的等效静力风荷载。
Based on test data achieved from wind tunnel test conducted for wind pressure measurement of rigid models of two practical buildings with complicated section in diagonal arrangement, the comprehensive shape coefficient and distribution characteristics of wind pres- sure coefficient were analyzed, and mechanism for aerodynamic interference effect on buildings was discussed. The results indicate that with two tower buildings in side by-side arrangement a constant vortex would exist between two buildings, whose surface are characterized by high nega- tive pressure, and wind load would largely exceed the single building; Possible periodic vortex shedding from both sides of these two buildings increases RMS value of across-wind dynamic response when in parallel arrangement. In addition, average wind load accounts for significant proportion of equivalent static wind load, so was background components in fluctuating wind load. For free vibration frequency of building largely exceeds the excellence frequency of aerody- namic force, the increased stiffness of structure can＇t significantly reduce equivalent static wind load. ：
出处
《实验流体力学》
CAS
CSCD
北大核心
2013年第5期16-24,共9页
Journal of Experiments in Fluid Mechanics
基金
国家自然科学基金项目(51278367-50878159)
土木工程防灾国家重点实验室自主课题(SLDRCE10-B-03)
关键词
高层建筑
风荷载
气动干扰
等效静力风荷载
high-rise building
wind load
aerodynamic interference effect
equivalent static wind load
