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동조액주관댐퍼의 가진진폭별 오르피스감쇠특성에 대한 연구
유기표(You Ki-Pyo),유장열(You Jang-You),송창현(Song Chang-Hyun),김영문(Kim Young-Moon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.6
With the production of light?weight and high?strength construction materials and the advance of structure design techniques, various forms of high?rise buildings are being constructed. These buildings cannot help considering the effect of wind load. Because wind velocity grows higher with the increase in height from the ground, high?rise buildings respond sensitively to the wind and make vibration. In order to reduce the vibration, many additional mass devices are being developed. Recently, supplementary dampers using tuned liquid column damper (TLCD) are being developed actively. This study purposed to measure the amplitude response and the head loss coefficient of TLCD for different sizes of excitation amplitude according to the aperture ratio of orifice. In addition, we obtained the head loss coefficient according to the length of the horizontal column at natural frequency determined by the length of the vertical column and the horizontal column of TLCD. Thus, this study analyzed for the amplitude response and head loss coefficient of tuned liquid column damper according to the porosity of orifice while vibrating amplitude and natural frequency change. In addition, as the natural frequency of TLCD is determined by the length of the vertical and the horizontal column, we examined the variation of the head loss coefficient of orifices in adjusting natural frequency according to the length of the horizontal column. In the results of experiment, the larger vibrating amplitude was, the lower the head loss coefficient was. Under the same porosity, the head loss coefficient decreased by up to 4 times by 1mm of vibrating amplitude and 20mm of vibrating amplitude. Porosity and vibrating amplitude had a considerable effect on the head loss coefficient. When the length of the horizontal pipe increased, the overall head loss coefficient decreased by around 1.5-2 times.
공력진동실험을 이용한 고층건물의 변장비 변화에 따른 횡방향 진동응답
유기표(You Ki-Pyo),김한영(Kim Han-Young),조지은(Cho Ji-Eun),김영문(Kim Young-Moon) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.10
Modern flexible tall buildings with reduced damping ratios are sensitive to wind-induced vibrations. Most of the excessive wind-induced vibrations of tall building are due to vortex-induced vibrations. The type of building section model having sectional area of 0.0025㎡ and the height of 0.5m with side ratio denoted as D/B, of 1.0, 2.0, 3.0, 4.0 was selected for aeroelastic experimental study. All measurements were made in a boundary layer wind tunnel at the Chonbuk National University Wind-tunnel Lab. In this paper, the vortex induced vibration of tall buildings with aspect ratio 10 was investigated in turbulent layer flows over suburban areas. Effectiveness of increasing damping ratios was investigated.
설시뮬레이션풍동을 이용한 단동형과 연동형 비닐하우스 지붕에 대한 적설하중평가
유기표(You, Ki-Pyo) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.7
Heavy snowfall has damaged standalone green houses and the typical pattern was, regardless of area, M?shaped collapse resulting from the breakdown of roof rafters by excessive snow load on the roof. As to the pattern of damage to multi?span green houses by heavy snowfall, excessive snow load worked on the hollow parts and pressed the rafters and, as a result, the columns were broken and tilted. This study purposed to analyze snowdrift pattern by conducting a snow simulation wind tunnel experiment on single?span and multiple?span green house roofs using artificial snow. Snow depth was larger on single?span roofs than on multiple?span ones. However, Snow depth on the hollow part between two houses in multiple?span green houses was larger than that on the top of the roof. When three standalone green houses were deployed in parallel, the middle one showed 18?20% larger snow depth than the others. The largest snow depth was measured on the top of each green house, and snow depth at the part where wind direction changed was 20?30% less than that at other parts.
유기표(You Ki-Pyo),황진택(Hwag Jin-Taik),이후룡(Lee Hoo-Ryong),윤현재(Yoon Hyun-Jae),김영문(Kim Young-Moon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
Wind pressure experiments are conducted using a pressure transducer in order to examine the change of wind pressure in tall buildings, but the equipment is expensive and difficult to fix directly on the model. Thus, wind pressure experiments are often performed using pipes and tube taps. In many cases, however, because of the reduced scale in wind tunnel experiments and other reasons, the pipe for measuring wind pressure at a specific position of a tall building cannot be maintained constant. Thus, the present study obtained a pressure transfer function according to the length and thickness of tube tap and the shape of tube in the model, and conducted a calibration experiment using a restrictor . The results of the experiment are as follows. 1) The effect of the length of the tube tab installed in the model was insignificant that it was negligible in the tube pressure measuring system using a tube. 2) In case the tube tab was bent when a model was built, the length of the bent part did not have a significant effect on pressure. 3) When the tube installed inside the model was twisted, it did not have a significant effect on the result of wind pressure measurement.
유기표(You Ki-Pyo),김영문(Kim Young-Moon) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.2
This study purposed to predict wind energy for small size wind power generators at 50m above the ground in each area using mean wind speed data for 10 minutes collected from 2001 to 2011 by meteorological data in large cities having over 60% of 15 story (50m) or higher apartments including Seoul, Daejeon, Gwangju and Daegu representing the inland region, and Busan, Incheon and Ulsan representing the coastal region. In the results of analysis, we confirmed close agreement between observatory weather data and probability density distribution obtained using Weibull's parameters, and this suggests that Weibull's parameter is applicable to the estimation of wind energy. Hourly output energy using the mean wind speed for 10 minutes and output energy obtained from Weibull's parameter showed an error less than 5%, and thus it was found that wind energy can be evaluated using Weibull's modulus.
모의눈의 상사와 풍동실험장치를 이용한 건축물의 적설형태에 대한 연구
유기표(You Ki-Pyo),이후룡(Lee Hoo-Ryong) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.4
We need to know snowdrift patterns in order to assess snow load on a building. Various methods have been studied to evaluate snowdrift patterns, but the most effective one is the use of snow particle. This study examined how to simulate of snow particle, and analyzed snowdrift patterns on buildings using a wind tunnel system. Snow particle was produced with sodium bicarbonate. Snowdrift patterns on buildings simulated using snow particle were compared with measured data obtained from a real building (the roof of low-rise building and antarctic building). In the results of wind tunnel experiment with buildings using snow particle, the snowdrift patterns on flat roof and gable roof according to wind velocity agreed well snow accumulation of real buidling. The form of snow accumulation around the antarctic building was similar to the form of snow accumulation actually measured by Mitusuhashi.
유기표(You Ki-Pyo),유장열(You Jang-Youl),김영문(Kim Young-Moon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.2
Fruit growers install wind fences to prevent fruits from dropping. To examine the effect of wind fences in reducing wind velocity, this study conducted a performance experiment, a farmhouse model wind tunnel experiment, and field measurements, and analyzed how wind fences reduce wind velocity. Among the three types of wind fence with porosities ranging between 30%, 40% and 55%. For the wind fence experiment, we selected two fruit farms growing pears. We modeled the fruit farms and the surrounding topography at a scale of 1/1000. Field measurements to examine the effect of wind fences on wind velocity reduction were made at a real farm, which was Farm 1 in the model experiment. The windbreak performance of the wind fence was highest when its porosity was 40%. According to the result of a field measurements at Farm 1, wind velocity decreased by 92% at 6m behind the shelter fence. This result is almost coincident with the result of an experiment on the performance of a wind tunnel experiment.
기상측정을 위한 팔각형 적설 바람막이 팬스에 대한 성능실험 및 평가
유기표(You, Ki-Pyo),남병희(Nam, Byung-Hee),이천우(Lee, Chun-Woo) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.6
Meteorological Observatory installs measuring boards on the even ground of open space to measure the amount of snowfall. However it is very difficult to evaluate the accurate amount of snowfall because of the influence of wind. In order to measure snow fall, it was tried to identify the inside airflow of octagon wind fence which was not influenced by wind. We performed computing fluid dynamics, wind tunnel test and field measurement of width and types of octagon wind break fence to analyze airflow inside of the fence. According to the result, dual fence was better than mono fence in wind speed reduction such as more than 50%. The fence whose wind fence wings were fixed on the surface showed better results than the fence detaching the wings from the surface. The reduction of the wind speed was the highest in the middle of the dual wind fence with 4m width. In wind tunnel test results, the fence attached to the surface with 4m width showed better wind speed reduction at the center of the inside than the fence with 6m width. In the actual measurement, 4m fence showed the best effects in wind speed reduction.