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인접건물의 종횡비 변화에 따른 고층건물의 변동풍하중 응답
유기표(You Ki-Pyo),김영문(Kim Young-Moon) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.5
Wind loads on buildings in realistic environments may be considerably either increase or decrease by interference buildings. It is commonly known as interference effect. This effect depend on the geometry and arrangement of these structures, their orientation with respect to the direction of flow and upstream terrain conditions. It is objective of this paper to study the interference effects of the tall buildings which have the different aspect ratios, upstream terrain conditions, distance between adjacent structures and direction of approaching flow. Two types of atmospheric flow conditions which represent open country (α =0.15) and urban flow (α=0.30) environment were simulated in the wind tunnel. The obstructing model used in this study have the aspect ratio of 2, 3 and 4 and the distances between adjacent buildings are 0.5B, 1.0B, 1.5B and 2.0B, which B is the width of the building. Incident wind directions are 0°, 15°, 30° and 45° to the face of the building. And the above experimental results were compared with experimental data measured on isolated building.
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.
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,김영문,유장열,You, Ki-Pyo,Kim, Young-Moon,You, Jang-Youl 한국공간구조학회 2013 한국공간구조학회지 Vol.13 No.2
This paper attempted to bridge this gap by identifying the number of flat-plate solar collectors. The characteristics of wind pressure coefficients acting on flat-plate solar collectors which are most widely used were investigated for various wind direction. Findings from this study found that the location where the maximum wind pressure coefficient occurred in the solar collector was the edge of the collector. Regarding the characteristics according to the number of collectors, the paper found that downward wind pressure coefficient of the lower edge of the collector was higher than the upward wind pressure coefficient of the upper edge of the collector in the basic module (1 piece). However, as the number of collectors increases, the upward wind pressure coefficient of the upper edge become higher than the downward wind pressure coefficient of the lower edge. Finally yet important, it was found that the location of the maximum wind pressure coefficient was changed according to the number of solar collectors.
유기표,김영문,유장열,백선영,You, Ki-Pyo,Kim, Young-Moon,You, Jang-Youl,Paek, Sun-Young 한국공간구조학회 2014 한국공간구조학회지 Vol.14 No.2
Meteorological observatories use measuring boards on even ground in open areas to measure the amount of snowfall. However, it is very difficult to evaluate the accurate amount of snowfall because of the effects of the wind. Therefore, this study tried to determine the internal wind flow inside a windbreak fence to identify an area that was not affected by wind in order to measure the snowfall. We performed a computational fluid dynamics analysis, wind tunnel test of the type and height of the windbreak fence, and analyzed the wind flow inside the fence. The results showed that a double windbreak fence was better than a single windbreak fence for reducing the wind velocity. The reduction of the wind velocity was highest in the middle of a windbreak fence with a width of 4 m and a height of 60cm, where the windbreak fences were fixed to the ground.
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.
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.
유기표(You Ki-Pyo),황지욱(Hwang Jee-Wook),유장열(You Jang-Youl),김영문(Kim Young-Moon) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.9
The increase of population and the expansion of residential and industrial districts are continuously decreasing the green coverage and the land coverage that can purify the quality of air. In addition, the increase of energy consumption in urban areas is causing the phenomenon of urban heat island. Accordingly, the urban heat island phenomenon is the best indicator of urban climate characteristics. We examined the change of wind velocity according to building layout in apartment complexes. The development of high-rise apartments in the downtown affected the wind roads of the whole city, decreasing wind velocity by up to 50% compared to that before the development.