와류진동 메카니즘 변화를 통한 초고층건축물의 풍진동저감
uppression of Wind-Induced Vibration of Tall buildings by Modifying Vortex Shedding Mechanism
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초록
초고층 건축물은 매우 세장하여 지진하중보다는 오히려 풍하중에 대해 매우 취약하다. 이러한 초고층건축물에 작용하는 풍진동은 buffeting, 와류 및 wake에 의해서 주로 발생한다. 풍진동은 구조적인 안전성뿐만 아니라 거주성을 결정짓는 중요한 인자이다. 본 논문에서는 풍진동을 줄이기 위해 와류진동에 대한 메커니즘을 변화시켜 저감효과를 연구하였다. 원형기둥과 원형기둥에 대하여 공력학적 형상으로 변화시킨 경우에 각각 rib와 spiral을 설치하였다. 풍동실험결과, rib와 spiral의 효과는 풍직각 방향에서 비슷한 저감정도를 보였고 원형기둥을 공력학적으로 변화시킨 형상에 rib와 spiral을 사용함으로써 공력학적인 이점이 복합적으로 작용하여 원형기둥의 풍직각방향에 대해 50%정도의 저감효과가 있었다.
Abstract
Tall buildings are very slender more vulnerable to strong winds than earthquakes. Wind-induced vibration on tall buildings are largely due to buffeting, vortex-shedding, and wake. Wind-induced vibration on such tall buildings is a significant factor to determine habitation as well as stability of a structure. In this paper, vortex-shedding mechanisms are varied to investigate suppression of wind-induced vibration. Wind-induced vibration experiments were performed for five shapes including the circle model, the case that ribs and spirals were attached to the circular model, and the case that ribs and spirals were attached to the aerodynamic shapes for the circular section From the results of the wind-induced experiments ,the response reduction effects by ribs or spirals were similar. The reduction of response amplitude about 50% that of the basic circular section for the cross-wind direction was the case that ribs and spirals were attached to the aerodynamically shapes.
참고문헌 (9)
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