| Title |
Wind-Excited Motions of Tall Buildings with Geometrical Shapes |
| Authors |
Cho Kang-Pyo ; Lee Ok-Jin |
| Keywords |
Tall Building ; Wind Tunnel Test ; Vortex ; Geometrical Shape ; Wind-induced Vibration ; Wind-induced Displacement |
| Abstract |
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, ) 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. |