풍직각방향 풍하중이 작용하는 구조물의 변장비와 형상비에 따른 동적 거동 특성

김주원 대한건축학회지회연합회 2015 대한건축학회연합논문집 Vol.17 No.2

본 연구에서는 풍동실험을 통하여 Liang 등이 제시한 풍직각방향 변동풍력 스펙트럼밀도를 적용하여 풍하중을 생성하고, 생성된 풍하중이 작용하는 사각형 평면형상을 가진 구조물의 동적 거동을 해석하는 프로그램을 개발하고자 한다. 기본풍속 40m/s이고 지표면조도구분 B인 지역 건물의 변장비와 형상비를 변수로 하여 구조물의 동적 거동을 해석하여 건물의 변장비 및 형상비와 구조물의 동적 응답의 관계를 분석하고자 한다. The random dynamic forces experienced by structure due to wind are caused primarily by the turbulence in the approaching flow and motion of the structure. In the paper, fluctuating wind velocity for time history analysis are simulated by a single variate single dimensional random process using Liang spectrum about across-wind direction. This paper analyzed and obtained the dynamic response for structures modeled as multi degrees of freedom system - the multistory shear building. The method for evaluating the damping matrix corresponds to any set of specified modal damping ratio. The numerical results, obtained by the Newmark-β method, shows the time-history responses and trends of maximum accelerations and displacements by applying various aspect ratios. In the paper, dynamic reponse characteristics including building side ratio and aspect ratio will be discussed.

건축물의 높이 및 변장비 변화에 따른 각주형 건축물의 평균풍압분포 특성에 관한 연구

하영철(Ha Young-Cheol),박재형(Park Jae-Hyeong),황성권(Hwang Sung-Kwon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4

This study summarizes basic results on the characteristics of mean wind pressure distribution on rectangular buildings with various heights and side ratio which is needed to estimate reasonable wind load of buildings, through simultaneous multi-point wind pressure test. 12 types of rectangular wind pressure test models with various heights and side ratios have been made for this study. Wind pressure tests are conducted on the Boundary Layer Wind Tunnel at Kumoh National Institute of Technology. The characteristics of mean wind pressure distribution with respect to various heights and side ratios of buildings are analyzed as a function of the aspect ratios and side ratios. The result shows that wind pressure is decreased as the aspect ratio decreases and wind pressure distribution is significantly effected by side ratios on low-rise buildings.

고층건축물의 비틀림방향 풍하중 평가를 위한 변동풍력계수 및 파워스펙트럼밀도계수의 제안

길용식,김동우,김하림,하영철 한국풍공학회 2007 한국풍공학회지 Vol.11 No.2

This study is to 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, force balance tests have been conducted on 27 types 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. 본 논문은 고층건축물의 비틀림방향 응답을 평가하기 위하여 필요한 변동비틀림모멘트계수와 변동비틀림모멘트의 파워스펙트럼밀도계수의 경험식을 제안한 연구이다. 이러한 경험식을 제안하기 위하여, 다양한 형상비와 변장비를 가진 27개의 각주형 모형을 제작한 후 노풍도을 다양하게 변화시켜 풍력실험을 실시하였다. 본 논문에서 비틀림방향 변동풍력의 경험식은 주로 건물의 노풍도와 형상비 그리고 변장비에 의하여 분석되어졌다.

도시내 건축물 주변의 풍자원 평가

조강표(Kang Pyo Cho),정승환(Seung Hwan Jeong),홍성일(Sung Il Hong),신승화(Seung Hwa Shin) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-

Wind velocity magnitude around buildings can be used to assess pedestrians' comport and wind energy. This paper's main purpose is to give basic ideas that may be used for wind resource assessment around buildings. In this paper, side ratio and span wise distance were selected as variables which affect wind velocity variation around buildings. Then wind velocity increasement ratios at the heights of pedestrian, small wind turbine installed in a roadlamp and the roof level by CFD analysis. It was shown that maximum wind velocity increasement ratios were obtained at the height of pedestrian about 116% and 148% for the side ratios of 1 and 2. Respectively at the height of small wind turbine installed in a roadlamp, maximum wind velocity increasement ratio was 95.3% for the side ratio of 2. Wind Velocity increasement ratios at the roof level were about 19% to 21% for all the side ratios. Locations at which maxim velocity increasement ratios were obtained were not the same for each height.

고층건축물의 비틀림방향 풍력특성에 관한 풍동실험연구

길용식,김동우,정영배,하영철 한국풍공학회 2006 한국풍공학회지 Vol.10 No.2

본 연구는 고층건축물의 비틀림방향 응답을 평가하기 위하여 필요한 변동비틀림모멘트계수와 변동비틀림모멘트의 파워스펙트럼밀도의 특성을 확인하는데 목적이 있다. 이러한 특성들을 평가하기 위하여, 다양한 형상비와 변장비를 가진 52개 형상의 공탄성 각주형 모형을 제작한 후 노풍도를 다양하게 변화시켜 풍동실험을 실시하였다. 본 논문에서는 비틀림방향의 변동풍력의 특성을 간단히 설명하였다. 그리고 그 결과는 대부분 건물의 형상비와 변장비에 의하여 분석되었다. This study aims at ascertainment 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.

풍하중을 받는 고층건축물의 변장비 변화에 따른 구조축방향의 동적응답 특성

배진석,황성권,하영철 한국풍공학회 2009 한국풍공학회지 Vol.13 No.1

이 연구는 고층건축물이 풍하중을 받을 때 변장비의 변화에 따라 구조축방향으로 풍응답이 어떻게 배분되어 가는지를 규명한 것이다. 변장비가 다른 3종류의 장방형 강체모형을 경계층 풍동 내에 설치하여 풍력실험을 수행하였다. 풍력실험으로부터 얻어진 변동모우멘트계수와 변동모우멘트의 파워스펙트럼밀도를 사용하여 스펙트럼모드해석법에 의하여 고층건축물의 응답을 평가하였고, X축방향의 풍응답과 Y방향의 풍응답을 비교하고 그 차이점을 분석하였다. 결과로부터 대상 고층건축물의 경우 모든 변장비에서 Y방향의 동적인 응답이 X방향 보다 큰 것을 알 수 있었다. The purpose of this study is to examine the difference of the structural axis directions response of tall buildings according to varying side ratios under wind actions. High Frequency Force Balance (HFFB) test was conducted on using elastic model of prismatic section with 3 types of side ratios in turbulent boundary layer flows. Tall building responses were estimated by Spectral Modal Analysis based on the values, such as fluctuating moment coefficient and power spectral density, acquired by the HFFB test. Finally, wind force responses of X-direction were compared to those of Y-direction and the differences of the two are pointed out. From the results, it is known that the dynamic responses of Y-direction are larger than those of X-direction to the all side ratios.

노풍도에 따른 고층건축물의 풍직각방향 변동풍력의 특성

하영철,김동우,최심국,길용우 한국풍공학회 2005 한국풍공학회지 Vol.9 No.1

By conducting HFFB(High Frequency Force Balance) test of across-wind forces on rectangular cylinders with various side ratios under 4 types of surface roughness condition in a boundary layer wind tunnel, this paper investigates across-wind fluctuating moment spectra, moment coefficients and Strouhal numbers by changing the conditions of surface roughness. Experimental results show that the across-wind fluctuating moment coefficients, moment spectra and Strouhal numbers do not significantly change dependent on the conditions of surface roughness. 지표면 상태에 따른 풍직각방향의 풍력특성을 규명하기 위하여 4가지의 지표면상태 하에서 다양한 변장비를 가진 사각형 각주에 대한 풍력실험을 실시하여 풍직각방향의 변동전도모멘트 스펙트럼, 변동모멘트계수 및 스트로할 수의 변화특성을 조사하였다. 실험 결과에 의하여 풍직각방향의 변동전도모멘트 스펙트럼, 변동모멘트계수 및 스트로할 수는 지표면의 상태에 따라 크게 변하지 않음을 알 수 있었다.

고층건축물의 풍상면 및 풍하면 평균풍압의 연직분포 특성

이은지,황성권,김동우,하영철 大韓建築學會 2008 大韓建築學會論文集 : 構造系 Vol. No.

This study summarizes basic results on the characteristics of the vertical distribution of mean wind pressure, which is needed to estimate reasonable vertical wind load of tall buildings. Aspect ratio of rectangular wind pressure models have been fixed to six and side ratios are changed into 15 type. Wind pressure tests are conducted on the Boundary Layer Wind Tunnel at Kumoh National Institute of Technology. The characteristics of vertical mean wind pressure distribution with respect to various side ratios are analyzed into windward direction and leeward. From these results, empirical formula for distribution of mean wind pressure with respect to height of windward and leeward direction were proposed

풍동실험에 기초한 풍방향 풍하중의 특성고찰

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.

고층건축물의 풍상면 및 풍하면 평균풍압의 연직분포 특성

이은지(Lee Eun-Ji),황성권(Hwang Sung-Kwon),김동우(Kim Dong-Woo),하영철(Ha Young-Cheol) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.3

This study summarizes basic results on the characteristics of the vertical distribution of mean wind pressure, which is needed to estimate reasonable vertical wind load of tall buildings. Aspect ratio of rectangular wind pressure models have been fixed to six and side ratios are changed into 15 type. Wind pressure tests are conducted on the Boundary Layer Wind Tunnel at Kumoh National Institute of Technology. The characteristics of vertical mean wind pressure distribution with respect to various side ratios are analyzed into windward direction and leeward. From these results, empirical formula for distribution of mean wind pressure with respect to height of windward and leeward direction were proposed