| Title |
Wind Tunnel Test Study on the Effective Elevation and Plan Shapes of Super High-Rise Building Resisting Wind-Induced Responses : Focussed on the Variations of Openings for Building |
| Keywords |
초고층건축물 ; 중공부 ; 풍진동 ; 와진동 ; 후류 ; 고유진동수 ; 감쇠정수 ; 파워스펙트럼 ; 무차원풍속 ; 공력불안정성 |
| Abstract |
The excessive wind-induced motion of tall buildings most frequently result from vortex shedding induced across-wind oscillations. This form of excitation is most pronounced for relatively flexible, lightweight and lightly damped structure, e.g. super high-rise building. This paper discusses aerodynamic means for mitigating the across-wind vortex shedding induced in such situations. Emphasis is on the change of the building cross section to design the building with openings from side to side which provide pressure equalization and tend to reduced the effectiveness of across-wind forces by reducing their magnitudes and disrupting their spatial correlation. The effects of building with openings on aerodynamic excitations and displacement responses have been studied for high-rise building with an assumed height 96m and breadth 12m in a wind tunnel. Wind tunnel test have been carried out on the Kumoh National University of Technology using rigid models with twenty-four kinds of opening shapes. The measured model aerodynamic excitations and displacement had been compared to those of a square cylinder with no openings to estimate the effectiveness of openings for wind-induced oscillations. Form these results, the effective opening shape, size and location for building to reducing wind-induced vortex shedding and responses are pointed out. |