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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.
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.
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.
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.
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.
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.
CFD 해석에 의한 그룹으로 조성된 아파트 건축물의 풍압 평가
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
In the paper, computational fluid dynamics analysis is performed for a B apartment building complex, in which building claddings were damaged when Typhoon Maemi hit the Korean Peninsula in September 2003. Wind pressure for two inner buildings was investigated according to the existence or nonexistence of neighboring buildings for the wind directions of S, SE, SSE and SSW. When two inner buildings were surrounded by neighboring buildings, negative wind pressure coefficients, ranged from about -0.1 to -0.7, occurred on the frontal surfaces of two inner buildings. However, when there were no neighboring buildings around two inner buildings, positive wind pressure coefficients, ranged from about 0.0 to 0.98, occurred on the frontal surfaces of the buildings. It was inferred from the study that building window glasses could be broken in a suction condition by strong negative pressures due to the shielding effect of neighboring buildings.