인접건물에 의한 고층건축물의 피크국부풍압 분포 I - 피크풍압분포 및 풍압파워스펙트럼 중심으로 -
Interference Effects on Local Peak Pressure of a Tall Building with an Adjacent Building - Focus on Peak Pressure Distribution and Pressure Power Spectra -
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초록
본 연구에서는 풍동실험을 통해 인접건축물의 다양한 높이비, 위치와 풍향에 따른 고층건축물에 작용하는 피크풍압계수에 대하여 조사하였다. 그리고 피크풍압계수는 Cook and Mayne의 제안식을 이용하여 산출하였다. 실험결과는 우선적으로, 인접건축물의 유무에 따른 최대 및 최소풍압계수의 분포도를 통해 비교 분석하였다. 풍동실험결과 풍향 135도에서 인접건축물의 높이비가 H_r≥1.5이고, (S_x,S_y)=(1.5B,0)에 위치할 때, 대상건축물의 정면에 작용하는 최소풍압계가 단독건축물에 작용하는 최소풍압계수(-3.5)에 비해 전반적으로 크게 나타났으며, 최소풍압계수의 최소값은 정면의 최상부 코너 부근에서 -4.7(H_r=1.5), -5.7(H_r=2.0)으로 나타났다. 본 연구의 결과는 CFD 해석 결과의 정당성 입증과 두동 이상으로 이루어진 고층건축물의 초기설계단계에서 상호간섭효과로 인한 외장재용 풍하중을 대략적으로 평가하는데 유용하게 사용할 수 있을 것이다.
Abstract
Local peak pressures between two buildings were studied by using wind tunnel experiments for various locations and height ratios of an interfering building and wind directions. The measured local peak pressure coefficients were compared to those obtained previously from a study on an isolated building. The experimental results have been examined and presented from the viewpoint of cladding design. The results show that at wind direction θ=135˚, minimum peak pressure coefficient on the front surface of the principal building with the interfering building for H_r≥1.5 at (S_x,S_y)=(1.5B,0) tends to increase generally and the smallest values of minimum peak pressure coefficients on the front surface of the principal building were -4.7(H_r=1.5), -5.7(H_r=2.0), while the smallest value of minimum peak pressure coefficient on the isolated building was -3.5. It can be explained by the fact that an increase in energies is associated with the reattaching shear layers on the principal building caused by high turbulence, thus significantly increasing the suction.
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