http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
유기표(You Ki-Pyo),김영문(Kim Young-Moon) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
Many investigations for reducing wind-induced vibrations of tall building have been conducted. One of them is adding an auxilIary damping device to the building so increase damping ratio of building and reducing responses of the building. In this paper, a passive TLD attached on the top of the aeroelastic building model of which has different side ratio of 2 and 3 and of which aspect raio is 8, was used for wind tunnel test. The boundary layer flow representing suburban area was simulated with normal direction is normal to the small face of the building model. The rms across-wind displacements at the top of the building model which was caused mainly by vortex-induced excitation were measured. It was found out that the effect of vortex-induced excitations of tall building is reduced effect of vortex-induced excitations of tall building 15 TLDs which have mass ratio of 1%-2% and frequency ratio of 0 95-1 05 were used for test. From the test results, maximum TLD effects for reducing vortex-induced excitations appears at the mass ratio of 15% and frequency ratio of 1%.
TMD을 이용한 풍하중을 받는 고층건물의 공력진동응답실험
유기표(You Ki-Pyo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.12
The aeroelastic experiment of along and acrosswind vibration was carried out on squire model in a suburban boundary layer. The model tuned mass damper consisted of a small aluminium block cantilevered downward on a piano wire. The TMD mass ratios are respectively 1.0%, 2.0%. The dampers were approximately tuned to the natural frequency of the building model. The type of building section model having sectional area of 0.004㎡ and the height of 0.4m with side ratio denoted as D/B, of 2.0, was selected for aeroelastic experimental study. The lop maximum displacement RMS value appears at TMD2 and generalized mass ratio of 2%.
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.
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),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.
풍하중을 받는 고층건물의 진동 가속도 응답-각국의 하중기준과 풍동실험 비교-
유기표(You. Ki-Pyo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.7
For tall buildings the magnitude of wind induced building motions is an important design consideration. Under the<br/> influence of dynamic wind loads, typical tall building oscillate in the alongwind, acrosswind and torsional directions. The<br/> codes and standards by this study are Japan, United States, Canada, Korea. The wind tuneel data of building section model<br/> having sectional area of 0.01㎡and the height of 0.4m with side ratio denoted as D/B, of 1.0 was selected for force balance<br/> experimental study. Two types of atmospheric flow conditions which represent suburban (α=0.15) and urban(α=0.33) flow<br/> environment were simulated in the wind tunnel. All measurements were made in a boundary layer wind tunnel at the Chonbuk<br/> National University Wind-tunnel Lab. In this paper, the comparison between the acceleration response predicted by wind<br/> tunnel data and estimated by provisions in codes.
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.
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),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.