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원형다공방풍팬스의 후면에 있는 저층건물의 풍압분포 특성에 대한 연구
유기표,전종길,김영문,유장열 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.10
The effects of porous wind fence on the pressure characteristics around low-rise building model were investigated experimentally. Flow characteristics of velocities and turbulences behind wind fence were measured using hot-wire anemometer. The wind fence characterize by varying the porosity of 0 %, 20 %, 40 % and the distances from the wind fence from 1 H to 9 H with maintaining the uniform flow velocity of 6 m/s. we investigated the overall characterization of the low-rise building by measuring pressure seventy four on model. The effects of porosity fences varied with the porosity of the fence and measurement locations(1H-9H). The 20% porosity proved to be effective for the protection area of 1H to 3H, but the 40% porosity proved to be effective for the protection area of 4H to 6H. The low-rise building of front face was found to be best wind fence for decreasing the mean, maximum and minimum pressure fluctuation.
유기표,You, Ki-Pyo 한국공간구조학회 2011 한국공간구조학회지 Vol.11 No.2
축사는 비닐하우스 다음으로 자연재해에 취약한 농촌시설물이다. 축사의 경우 측벽 없이 지붕만 있는 형태가 가장 많이 사용되고 있는데, 태풍이 불면 지붕 전제가 날아가 많은 피해가 발생하는 실정이다. 그래서 농가에서는 태풍피해예방을 위한 측벽에 윈치 커튼설치하여 피해를 예방하고 있는 실정이다. 본 논문에서는 측벽 개방에 따른 축사지붕에 위치별 풍압 계수 분포특성에 대해서 알아보고자 한다. 측벽유무에 관계없이 축사지붕면의 피크외압계수분포에서 풍향각 $0^{\circ}$로 불어오는 방향에 대해서 불리하게 작용하고 있는 것을 알 수 있다. 그러나 측벽의 유무에 따라 피크외압계수가 풍향각과 처마의 길이에 영향을 받는 것을 확인할 수 있었다. Livestock buildings are rural facilities as vulnerable to natural disasters as vinyl houses. Many of livestock buildings have a roof but without side walls. The roof of such structures is easily blown away by a typhoon and this results in a heavy loss. Therefore, farmers install winch curtains on the sides to prevent damages caused by typhoons. This study purposed to examine the distribution of wind pressure coefficient among different positions of livestock shed roof according to the opening of side walls. It was found that according to the distribution of peak external pressure coefficient on the roof surface of livestock shed, the wind blowing at wind angle $0^{\circ}$ was disadvantageous to roof surface regardless of the presence of side walls. However, it was confirmed that the peak external pressure coefficient was affected by wind angle and the length of eave depending on the presence of side walls.
유기표,김영문 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.1
Advanced in structural materials and construction methods have resulted In flexible and light tall building Therefore, the assessment of structural safe ad service performance of a tall building during strongwind is an Important design criteria Many investigations for mitigating wind-induced excitations of tall building have been carried out Aerodynamic modification of building shape changing the cross section w1th height through tapering, which altering the flow pattern around the building could reduce wind-induced excitations of tall building The fact that a tapered tall building might spread the vortex-shedding over a broad range of frequencies makes more effective for reducing acrosswind responses has been established In this paper, to investigate tapering effect for reducing wind-induced responses of a tapered tall building, high-frequency force-balance test was conducted Four types of building models which have different taper ratio of 5%, 10%, 15% and one basic budding model of a square cross-section were tested under the two typical boundary layers representing suburban and urban flow environment The effect of wind direction was also considered
유기표,조지은,전종길,김영문 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
To investigate the tapering effect for reducing the across-wind response of a tapered tail building, aeroelastic model tests were carried out. Three types of aeroelastic building models which have different taper ratio of 5, 15% and one basic model of a square cross-section were made and tested under the one typical boundary layer of suburban flow conditions with a power low exponents of 0.15 with the wind direction is 0 degree which is normal to the front surface of each model. Dimensions of each aeroelastic model were appeared in Figule2. Before experiments, natural frequencies and damping ratios of each model were estimated by the free vibrations decay method based on the logarithmic decrement. Silicon oil with varied viscosities was used to adjust the damping ratio of each model.
유기표,고낙호,김종수,김영문 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
Research about vibration control that use tuned liquid damper (TLD) that is economical and efficient to reduce vibration (vibration displacement and acceleration)occurrence about strong wind of tall building The effect of reducing vortex induced the vibration of tall buildings with TLD which has a aspect ratio of 8 was investigated in the boundary layer flows presenting suburban area. Using aeroelastic building model which have a TLD in the top level. The top displacement RMS value reduces to that of the original building model without a TLD when the generalized mass ratio equals to 1.0%. The optimal frequency of the TLD range between 0.9 and 1.0 of that of the building model which is consistent with the analytical derivation.
유기표,유장열,고낙호,김영문 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.4
The present study examined the characteristics of rectangular and circular tuned liquid dampers (TLDs), which are used to control wind-induced vibration in tall buildings, according to natural frequency. For this, we conducted shaking table experiments for four natural frequencies (0.44, 0.55, 0.64 and 0.73Hz). The tuning characteristic of the TLD water tanks was better in circular water tanks than in rectangular water tanks. The damping ratio based on the energy dissipation capacity was affected by the excitation amplitude. At low excitation (below amplitude 5mm) and low natural frequency (0.44Hz), circular water tanks were more advantageous than rectangular water tanks. However, at high excitation (over amplitude 5mm) and high natural frequency (over 0.55Hz), rectangular water tanks were better than circular water tanks.
유기표,김영문,조지은 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.3
Wind induced vibration of tall buildings have been of interest to engineering for a long time. Most effective of Wind-induced vibration control of a tall building use passive control devices. This paper investigates the effect of damping ratios using a triangular shaped bar in order to increase the TLD damping ratio for a rectangular TLD tank with a shallow water. Triangular shaped bars were installed at the base of a water tank in which the height (H) of these bars were 60mm, 80mm, and 100mm. These bars were installed by 1, 2, and 3 with a specific distance at the base of a water tank in order to experiment for certain applied amplitudes. The installation of dampers didn't affect the natural frequency. In the characteristics of the base shearing force and wave height, it is evident that the small excited vibration amplitude (1mm~5mm) presented a decreased rate of about 40% as the maximum value, and the large excited vibration amplitude (20mm) presented about 20% of the decreasing rate. These effects were also observed in the change in the damping ratio.