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길용식(Kil Yong-Sik),황규석(Hwang Kyu-Seok) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
This study estimated the characteristic of Topographic factors on three dimensional complex hills through the wind tunnel tests. The wind tunnel tests was performed using various hills models which have a slop of 21.80°, that is based on the Korean Building Code (KBC2005). From the results of wind tests, Topographic factors on three dimensional complex hills were calculated at various positions and the ranges of topographic effects were decided. In the characteristics of wind speed-up, the results of wind tests show that the complex hills have difference from the general hills.
고층건축물의 비틀림방향 변동풍력 평가를 위한 경험식 제안
길용식(Kil Yong-Sik),김동우(Kim Dong-Woo),하영철(Ha Young-Cheol) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This study estimate the empirical formulae of torsional fluctuating moment coefficient and power spectral density, which is needed to estimate torsional response of tall buildings. In order to estimate empirical formulae, the wind tunnel tests have been conducted on 27 types aero-elastic model of the rectangular prisms with various aspects ratios, side ratios and surface roughness in turbulent boundary layer flows. In this paper, empirical formulae of torsional fluctuating wind force are mainly analyzed as a function of the aspects ratios, side ratios and various roughness of buildings.
신구용,임재섭,황규석,길용식,Shin, Koo-Yong,Lim, Jae-Seob,Hwang, Kyu-Seok,Kil, Yong-Sik 한국강구조학회 2011 韓國鋼構造學會 論文集 Vol.23 No.1
골조로 구성된 철탑의 풍력계수는 구성부재의 단면형상, 충실율 등에 의해 변하며 풍향각에 의해서도 여러 가지 특성이 나타난다. 본 연구에서는 이러한 철탑골조에 대하여 충실율과 풍향각을 변화시키면서 풍동실험을 수행하여 철탑골조에 작용하는 풍력특성을 평가한다. 실험은 먼저 철탑을 구성하고 있는 부재의 특성을 파악하기 위한 기본형상 부재에 대한 실험을 수행하였다. 그리고 철탑 사각골조는 2D와 3D 형태로 기본형에 철탑부재를 추가하는 방법과, 부재크기를 증가시키는 방법으로 충실율을 변화시킨 모형을 제작하였으며, 2D 형상은 풍향각을 0도에서 90도까지, 3D 형상은 풍향각을 0도에서 45도까지 변화시키면서 풍동실험을 수행하였다. 본 연구의 결과인 철탑 사각골조의 풍력계수 특성은 향후 철탑 풍하중 설계의 기초자료로 사용될 것이다. The wind force coefficient of a transmission tower frame shows several characteristics when the section shape, solidity ratio, and wind direction angle are changed. In this study, the wind force characteristics of a transmission tower frame with a basic structure were evaluated using different solidity ratios and wind direction angles in a wind tunnel test. According to the solidity ratio, the size of the structure and the rectangular-frame model of the transmission tower were changed by adding a two-dimensional (2D) or three-dimensional (3D) structure. The transmission tower's rectangular frame was tested by changing the wind direction angle of the 2D-type structure from 0 to $90^{\circ}$ and by changing the wind direction angle of the 3D-type structure from 0 to $45^{\circ}$ Based on the results that were obtained, it can be concluded that the wind force coefficient of a transmission tower frame can be used as preliminary data in deciding the transmission tower's wind load.
고층건축물의 비틀림방향 변동풍력의 특성에 관한 실험적 연구
하영철(Ha Young-Cheol),김동우(Kim Dong-Woo),길용식(Kil Yong-Sik) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This study aims at verifying characteristics of torsional fluctuating moment coefficient and power spectral density, which is needed to estimate torsional response of tall buildings. In order to estimate characteristics, the wind tunnel tests have been conducted on 52 types aero-elastic model of the rectangular prisms with various aspects ratios, side ratios and surface roughness in turbulent boundary layer flows. In this paper, characteristics of torsional fluctuating wind force are briefly discussed and then these results were mainly analyzed as a function of the aspects ratios and side ratios of buildings.
이은지(Lee Eun-Ji),황성권(Hwang Sung-Kwon),길용식(Kil Yong-Sik),하영철(Ha Young-Cheol) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.9
In the previous study, when wind direction was fixed to 0 degree, vertical mean wind pressure distributions with respect to building height had been examined by using wind tunnel test and an empirical equation of vertical mean wind pressure distribution with height had been proposed. This study examines how to change the vertical distribution of mean wind pressure of tall buildings when wind direction was changed. And the differences of vertical wind pressure distribution between to fix wind direction and to change wind direction were pointed out. Wind pressure tests were performed by using five rigid rectangular models with different cross sections in boundary layer flow. Aspect ratio of rectangular models has been fixed to six and wind direction has been changed an interval of 15 degree.
최운호(Choi Un-Ho),황성권(Hwang Sung-Kwon),길용식(Kil Yong-Sik),하영철(Ha Young-Cheol) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
This study survey the characteristics of along-wind loadings based on wind tunnel test. To analyze along-wind loading, the High Frequency Force Balance Tests have been conducted on 27 types aero-elastic model of the rectangular prism with various aspect ratio, side ratio and surface roughness in turbulent boundary layer flows. In this study, expression of along wind loading are mainly analyzed as a function of the aspects ratios, side ratios and various roughness of buildings.
길용식,김동우,하영철,이광렬,김종락 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This paper describes on the results of 1:400 geometrical laboratory modeling of wind-induced point pressure on the membrane roof structure of Stadium with variable roof slopes. The wind flow for flat ground surface was simulated in a boundary wind tunnel at Kumoh National Institute of Technology. The roof slope of membrane structure changed into 5 types. The locations of wind pressures taps are distributed on the same upper and lower part of membrane roof. The resultant wind pressure for each measurement points are analysed on 2 categories. One is acting on upper direction, the other is lower direction. The results showed that in the case of upper direction the changes of wind pressures on the membrane roof are not dominant in regard to changing roof slope, but in lower direction wind pressures are increased at the rear part of roof with changing roof slopes.