在风洞试验和数据分析的基础上，对面对面和角对角两种布局的双子塔建筑的气动特性和抗风性能进行了对比研究。研究的目的是为超高层双子塔的设计选型优化提供技术参考。结果表明，双塔建筑对风效应的性能取决于多个因素，包括双塔间距、结构动力特性、设计风速等。在较低的约化风速下，这两种布局的双子塔风效应没有明显差别。然而，当约化风速达到7以上后，双子塔将对塔楼的间距变得相当敏感，从而这两个不同的布局的抗风性能差别就会很明显。当双塔的相对间距在0.5左右或更窄时，角对角布局会导致严重的尾流激振，因此面对面布局的抗风性能相对较好。然而，随着间距的增加，角对角布局中的尾流激振会相应减弱。同时，角对角布局开始展示在借助气动干扰抑制涡激振动方面比面对面布局更为持续的优点，这导致角对角布局下的横风向动力响应比面对面布局显著减小。在相对间距为2时，角对角布局的风致倾覆力矩仅为面对面布局时的60%左右。
Abstract
A comparison study is conducted on aerodynamic characteristics and wind resistance of twin-tower buildings with two configurations, i.e., side-by-side and corner-to-corner, based on wind tunnel testing and aftermath analysis. The purpose of the study is to provide technical references to the optimization design of supertall twin buildings. The results indicate that the performance of the twin-tower buildings to wind effects depends on many factors, including the spacing between the two buildings, the structural dynamic properties, design wind speed, etc. In a lower reduced wind speed, the wind responses of the twin-tower buildings with these two configurations are similar to each other. However, when the reduced wind speed exceeds 7, the twin-tower buildings become quite sensitive to the spacing between the two buildings, and corresponding performance of these two configurations appears very different from each other. At relative spacing of 0.5 or narrower, the corner-to-corner configuration can cause severe wake buffeting, so the side-by-side configuration shows better performance for wind effects. However, as the spacing increases, the wake buffeting in the corner-to-corner configuration becomes less significant. Meanwhile, the corner-to-corner configuration starts to show a more sustainable benefit than the side-by-side configuration in suppressing vortex shedding by aerodynamic interference, which results in a much lower response in the across-wind dynamic response. At a relative spacing of 2, the wind-induced overturning moment of the corner-to-corner configuration is only about 60% of that of the side-by-side configuration.
关键词
高层建筑 /
双塔建筑 /
建筑布局 /
气动特性 /
风致响应 /
风洞试验
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Key words
high-rise building /
twin towers /
building layout /
aerodynamic characteristics /
wind induced response /
wind tunnel test
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