Abstract The present investigation is concerned with the phenomenon of aerodynamic interference across three cases: between two circular cylinders; a pair of 1:50 tapered cylinders; and a pair of 1:40 tapered cylinders—all in staggered arrangement. Experiments were conducted in the 1.6 ​m × 1.6 ​m wind tunnel at IIT Delhi. Our focus is on the enhanced across-wind response of the downstream cylinder near the first critical wind speed (at which the vortex shedding frequency matches the natural frequency of the structure). It is shown that the magnification in the response (with respect to that of the isolated cylinder) is a strong function of both the pitch and the orientation. It is evident from the current investigation that the magnification factors recommended in IS 4998 (Part 1: 1992, see Fig. 1 therein/2015) and Eurocode 1 (Actions on structures- General actions- Part 1–4: Wind actions, see Equation E. 11 therein) need to be revised upwards. Further, the rule of thumb, used in the design of tall structures, that beyond 15/20 diameters interference is negligible is not tenable, especially for structures of identical geometry.

中文翻译：

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第一临界风速附近直筒和锥筒对的气动干扰

摘要 本研究涉及三种情况下的气动干扰现象：两个圆柱之间；一对 1:50 锥形圆柱体；和一对 1:40 的锥形圆柱体——全部交错排列。实验在 IIT 德里的 1.6 米 × 1.6 米风洞中进行。我们的重点是在第一临界风速附近增强下游圆柱体的横向风响应（此时涡旋脱落频率与结构的自然频率相匹配）。结果表明，响应中的放大倍数（相对于孤立圆柱体的放大倍数）是俯仰和方向的强函数。从目前的调查中可以明显看出，IS 4998（第 1 部分：1992，见图 1）中推荐的放大系数。1 其中/2015) 和欧洲规范 1（结构作用-一般作用-第 1-4 部分：风作用，参见其中的公式 E.11）需要向上修订。此外，在高层结构设计中使用的经验法则，即超过 15/20 直径的干扰可以忽略不计是站不住脚的，尤其是对于相同几何形状的结构。