도플러 소다 실측을 통한 익산 지역의 풍속 연직분포에 관한 연구

조강표(Cho, Kang-Pyo),정승환(Jeong, Seung-Hwan),다니 페르위타 사리(Dany Perwita Sari) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.1

The mean wind velocity profile obtained using wind velocities measured by Doppler SODAR at Iksan City Hall area are analyzed. Wind velocities are measured at a total of twelve levels, at 20-meter intervals from 39.4 meters to 259.4 meters, and are averaged for ten minutes. Also, the occurrence frequency of wind velocity by wind direction is estimated. The area of Iksan City Hall corresponds to exposure B according to Korean Building Code. The mean wind velocity profile and the power law exponent at Iksan City Hall area are estimated using data measured by Doppler SODAR and are compared with those of Korean Building Code. It was found from the study that wind velocities obtained from Doppler SODAR were 0.1m/s to 0.5m/s larger than those from Korean Building Code above about 80 meters from ground.

고층 건축물의 수평진동에 대한 사용자의 지각임계가속도

조강표,신성우,정승환,조수연,Cho, Kang-Pyo,Shin, Sung-Woo,Jeong, Seung-Hwan,Cho, Soo-Youn 한국전산구조공학회 2007 한국전산구조공학회논문집 Vol.20 No.3

본 논문에서는 진동대를 이용하여 고층 건축물의 수평진동에 대한 지각임계가속도를 측정하였다. 바람에 의한 초고층 건축물의 과도한 진동은 거주자들에게 시각차와 현기증 같은 불쾌감을 줄 수 있다. 초고층 건축물 거주자들에게 쾌적한 환경을 제공하기 위해서는 가속도를 제한할 필요가 있다. 초고층 건축물은 1차 고유주기에 지배적이다 본 연구진은 1차 고유주기를 재연하기 위해 진동대를 사용하여 사인파진동에서 실험을 수행하였다. 실험은 진동하우스를 제작하고, 건장한 40명의 피험자를 대상으로 실시하였다 40명의 피험자를 8명씩 5개조로 나누고, 특정주파수범위$(0.2Hz{\sim}1.2Hz)$에서 가속도를 증가시키면서 수평진동에 대한 인지도를 측정하였다. 수평진동실험으로 피험자들의 진동에 대한 인지도를 누적분포표로 만들고, $0{\sim}20%,\;21{\sim}40%,\;41{\sim}60%,\;61{\sim}80%,\;81{\sim}100%$의 누적분포에 대해 추세선을 그려서 성능평가곡선을 작성하였다. In this paper, acceleration threshold of perception for the horizontal vibration of tall buildings was estimated. Excessive vibration of tall buildings by wind can give displeasure, such as giddiness and visual insecurity. To provide comfortable environment to residents of tall buildings, acceleration needs to be limited. For tall buildings the first mode of vibration is dominant. To reproduce the first mode of vibration, experiments were performed by generating sine waves by a shaking table. A nitration house was made and forty persons were employed for experiments. The forty persons were organized into five experimental groups, each of which was composed of eight persons, and the threshold of perception for horizontal vibration was measured by increasing acceleration in the range of 0.2Hz through 1.2Hz of frequency, Performance curves were obtained by dividing the distribution of perception for horizontal vibration into the range of $0{\sim}20%,\;21{\sim}40%,\;41{\sim}60%,\;61{\sim}80%\;and\;81{\sim}100%$ and by fitting curves.

벽식점성감쇠기의 고층건물 풍진동 제어성능에 관한 연구

조강표(Cho Kang-Pyo) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.12

This paper presents the effectiveness of wall-type viscous dampers for controlling wind-induced vibrations of a high-rise building. A five-story experimental building model, square in plan, was designed and constructed for investigation of effectiveness of wall-type viscous dampers in the wind tunnel. This paper describes the physical modelling, its instrumentation, experimental set-up, damping mechanism, and methodology. The effectiveness of wall-type viscous dampers in attenuating vibratons was investigated for different fluid levels in the walls and at varying wind speeds and attack angles. Wind-tunnel results show that wall-type viscous dampers are highly effective in reducing wind-induced vibrations and in wide band of exciting frequency.

주변 구조물이 산악지형의 풍속 증가에 미치는 영향

조강표(Cho Kang-Pyo),정승환(Jeong Seung-Hwan) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.1

In the study, the effects of surrounding structures on wind speed-up over an isolated hill are investigated by performing computational fluid dynamics (CFD) analysis. In the analysis, topographic factors are estimated first for the hill the height of which is H, and then topographic factors for the hill are estimated when there is a structure of a rectangular parallelepiped type around the hill. In the case that there is a structure, topographic factors are estimated for different locations and heights of the structure, that is, in the cases that the structure is 5H, 10H, 20H and 30H windward from the crest of the hill and the height of the structure is 0.25H, 0.5H and 0.75H. In the analysis, wind speed increased largely above the crest of the hill. Wind speed increased about 87% above the crest of the hill when there was no structure around the hill. In the cases that the structure was 5H, 10H, 20H and 30H from the hill, wind speed increased about 57% to 82%. In the case that the location of the structure was greater than 30H and the height of the structure was less than 0.25H, wind speed above the hill decreased a little bit. It was shown that as the location of the structure became less distant from the hill, wind speed-up effects became smaller.

고층아파트 건축물 창유리의 내풍 안전성

조강표(Cho Kang-Pyo),홍성일(Hong Sung-Il),김원술(Kim Won-Sool) 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.1

전산유체 해석에 의한 두 산악지형 사이의 풍속증가에 관한 연구

조강표(Cho Kang-Pyo),정승환(Jeong Seung-Hwan) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.1

Wind velocities at various locations around hills for the distances between two conical shaped hills having the same height of 100m, that is, 2m, 20m, 40m, 60m and 140m, are estimated using computational fluid dynamics(CFD) analysis. Wind velocities obtained for the two hills are compared with those obtained for one hill as well as a plain. Compared with wind velocities for a plain, for the distances between two hills, that is, 2m, 20m, 40m, 60m and 140m, wind velocity between two hills at the height of 3m was increased by about 37%, 23%, 16%, 11% and 4%, respectively. In the case that the distance between two hills was 2m, the rate of wind speed-up at 3m above ground at the midpoint between two hills was about two times larger than that of the case of one hill. When the distance between two hills was 140m, the rate of wind speed-up was less than 5% at 3m above ground at the midpoint between two hills. Also, at the midpoint between two hills and at the foot of a hill in the crosswind direction, the rate of wind speed-up was less than 5% above 230m above ground. It was found from the study that the closer the distance between two hills, the larger wind velocity between two hills and at the foot of a hill by channeling effect.

거주자의 자세에 따른 수평진동 체험실험

조강표(Cho Kang-Pyo),김선희(Kim Sun-Hee) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.7

The purpose of this study is to estimate occupant's acceptability-grade for horizontal vibrations of tall buildings by posture of occupants, of which human comfort criteria are not currently included in the Korean building code. A one-dimensional shaking table was used for horizontal vibration experience of young people group. And a container-room with similar to a living space in residental house was prepared on the shaking table. The horizontal vibration experience test was performed by people sit or lie on the floor of the container-room. They experienced by increasing acceleration in the specified frequency range of from 0.2㎐ through 1.2㎐. The feeling of testee was examined using a questionnaire based on human comfort criteria of foreign countries. From the results of the horizontal vibration experience test, cumulative percentage of allowable acceleration amplitude by each frequency was computed for the two postures. It was shown from analyzing trend lines of allowable acceleration by posture for horizontal vibrations that as the natural frequency of a building becomes higher, testee in a lying posture experienced less shaking than those in a sitting posture and the slopes of the trend lines were generally gentle. It was observed from investigating the feeling of testee that as the natural frequency of a building becomes higher, they experienced intense shaking and testee in a lying posture felt less displeasure for vibrations than those in a sitting posture did.

아파트 건축물 군(群)에 의한 건축물 외장재의 풍압분포

조강표,홍성일,김원술,Cho, Kang-Pyo,Hong, Sung-Il,Kim, Won-Sool 한국공간구조학회 2006 한국공간구조학회지 Vol.6 No.1

이 논문은 풍동실험 결과를 토대로 고층아파트 건축물의 풍압분포에 대한 내용을 다루고 있다. 태풍에 의해 창유리 파손을 입은 아파트 단지의 풍압모형을 제작하여 각 건축물의 상호간섭효과를 조사하였다. 풍동실험은 풍압모형을 이용하여 대형경계 층풍동에서 수행하였다. 간섭하는 주변건물의 여부에 따른 실험결과를 비교하고 검토하였다. 주변건물이 없어서 바람을 직접 맞을 때에는 105동, 106동은 주로 정압이 작용하였지만, 주변건물이 둘러싸고 있을 때의 105동, 106동은 큰 부압이 작용하는 것을 관찰할 수 있었다. 따라서 고층아파트 외장재 설계시 외장재의 안전성 확보를 위해서는 풍동실험을 수행하여 바람에 의해 야기되는 상호간섭효과를 고려하는 것이 가장 적합한 방법이라 할 수 있다. This paper presents wind pressure distribution on high-rise apartment buildings through wind-tunnel tests. In order to investigate wind-induced interference efforts on building claddings an apartment complex, which was damaged on the claddings during typhoon attack, was exampled and constructed as a scaled model. A series of wind tunnel tests using pressure models were performed in a boundary layer wind tunnel. The test results with and without interfering buildings were compared and discussed. It is observed that the wind pressure on buildings 105 and 106 with surrounding buildings shows highly negative, while the pressure without surrounding buildings were positive. Therefore the wind-induced interference effects should be taken into account in the design of claddings through wind-tunnel tests.

강풍시 고층아파트 건축물의 외장재 파손

조강표(Cho Kang-Pyo),홍성일(Hong Sung-Il) 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.2

초고층 건축물의 기하학적 형상에 따른 풍진동응답

조강표(Cho Kang-Pyo),이옥진(Lee Ok-Jin) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.6

Modern tall buildings having multiplex functions are increasing in height for the powerful use of city land by the development of construction skills and the progress of structural analysis techniques. However, those tall buildings are very slender and vulnerable to lateral forces such as wind load because the height of a tall building is much larger than its width. Wind-induced responses of buildings are different according to the geometry of buildings, which have possible dynamic effects by wind, flexible and slender tall buildings, structural characteristics and turbulent characteristics of wind. In the paper, square, equilateral triangular and circular sections were selected as basic plane shapes of buildings, and wind-induced vibration experiments were performed in a boundary layer wind tunnel for the very slender case with the ratio of section and height (aspect ratio, H/√A) of six for each section. Also, the setback and tapering were tried to suggest an aerodynamically favorable shape for the circular section. The experiment results are in the form of response lissajous, response with reduced response with reduced wind velocity. Comparing the reponses by each basic shape, the response of displacement by wind velocity was the first largest for the equilateral triangular section, the second largest for the square section, and the third largest for the circular section. Also, investigating aerodynamically favorable shapes for the circular section, it was found that the response amplitude for the setback was much less than the tapering.