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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
풍하중을 받는 테이퍼 고층 건물의 감쇠율변화에 따른 횡방향 공력진동응답
유기표 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.3
A wind-tunnel experiment using an aeroelastic tapered tall building model is carried out to investigate the tapering effect for reducing the across-wind response. Three tapered models which have different taper ratio of 5% and one basic model of a square cross-section without taper .Included in this study is the damping ratio effect of the model for reducing the response. Natural frequency and damping ratio of each model were estimated by the free vibration test. Tapering effect appears as the reduced wind speed is increased specially where the damping ratio of model has a higher value. At a lower value of damping ratio model tapering effect does not appears even a higher tapering ratio model it is.
Analysis of Performance Test Result of a Rectangular Tuned Liquid Damper by Direction of Wind
You, Ki Pyo,Kim, Young Moon,You, Jang Youl,Paek, Sun Young Trans Tech Publications, Ltd. 2015 Applied Mechanics and Materials Vol.775 No.-
<P>This study conducted a vibration table excitation test in order to evaluate performance of a tuned liquid damper (TLD), which was installed for vibration attenuation in a high-rise building, according to its installation direction. The TLD's base shear force and wave height characteristics changed according to excitation direction. When the excitation direction of the TLD was lower than 45 degrees, base shear force and wave height were the same as excitation direction at zero degree. However, when the excitation direction was 45 degrees or higher, base shear force and wave height were affected by excitation amplitude at 5mm or larger.</P>
The wind-induced response characteristics of atypical tall buildings
You, Ki-Pyo,Kim, Young-Moon John Wiley Sons, Ltd. 2009 The structural design of tall and special building Vol.18 No.2
<P>A tall building reacts sensitively to winds because the wind force increases according to the height and shape of the building. Various shapes of tall buildings and their aerodynamic characteristics have been studied extensively. For structural design and occupant comfort, the dynamic displacement of a tall building must be maintained within the criteria for acceptable levels of wind-induced motion. An aerodynamically appropriate building shape needs to be selected at the design stage of a tall building. In this study, wind-induced vibration responses were investigated, according to the criteria for maximum acceptable displacement and acceleration. Copyright © 2007 John Wiley & Sons, Ltd.</P>
Change of Wind Velocity Caused by the Development of Downtown Areas: A Case Study in Jeonju Korea
You, Ki Pyo,Kim, Young Moon,You, Jang Youl Trans Tech Publications, Ltd. 2013 Applied Mechanics and Materials Vol.421 No.-
<P>The development of downtown areas causes urban heat island (UHI), which raises the temperature of cities. To remove the causes of UHI, extensive research is underway for securing green spaces and fresh air corridors in urban districts. The development of high-rise apartments in the downtown affected the fresh air corridor of the whole city, decreasing wind velocity by up to 50% compared to that before the development. In addition, with regard to apartment layout in complexes, the front-rear inter-building distance had a higher effect on the change of wind velocity in the complexes than the side-to-side inter-building distance. However, in a layout with the same repetitive form, a wide side-to-side space increased the intensity of turbulent flow in the complex, making the wind velocity almost three times higher at some parts.</P>
Tuned Liquid Damper Experiment Using Shaking Table
You, Ki Pyo,Kim, Young Moon,You, Jang Youl Trans Tech Publications, Ltd. 2013 Applied mechanics and materials Vol.421 No.-
<P>The present study examines the characteristics of rectangular and circular tuned liquid dampers, which control wind-induced vibration in tall buildings, according to the natural frequency. The tuned liquid dampers (TLD) were of frequencies: 0.44Hz, 0.55Hz, 0.64Hz and 0.73Hz. The tuning feature of TLD water tanks was better in circular water tanks than in rectangular water tanks. Excitation amplitude affected the damping ratio based on energy dissipation capacity. At low excitation (below 5mm) and low natural frequency (0.44Hz), circular water tanks were advantageous over rectangular water tanks. However, at high excitation (over 5mm) and high natural frequency (over 0.55Hz), rectangular water tanks were advantageous over circular water tanks.</P>
You, Ki Pyo,Kim, Young Moon,You, Jang Youl Trans Tech Publications, Ltd. 2013 Advanced materials research Vol.823 No.-
<P>High-rise buildings in the city center construction has been with diversify disposition. As there is high wind on top of high-rise buildings, wind turbines are often installs on top of high-rise buildings. However, we can expect efficient power generation only by installing when the turbine in the place of heavy wind. In this article, it tries to evaluate wind power generation by performing airflow analysis around the roof according to the disposition of high-rise buildings.</P>
Fluctuations Response of Tall Building to Change of Aspect Ratio in Interference Building
You, Ki Pyo,Kim, Young Moon,You, Jang Youl,Paek, Sun Young Trans Tech Publications, Ltd. 2014 Advanced materials research Vol.937 No.-
<P>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. It is objective of this work to study the interference effects of the tall buildings which have the different aspect ratios, upstream terrain conditions, distance between adjacent structures and direction. The obstructing model used in this work 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. And the above experimental results were compared with experimental data measured on isolated building.</P>