| Title |
The Directional Wind Speeds for a Short Return Period in Korea : Evaluated by the Joint Probability Distribution of the Wind Direction and Speed |
| Keywords |
Wind Direction ; Daily Maximum Wind Speed ; Frequency ; Wind Speed for Return Period ; Probability ; Habitability |
| Abstract |
The basic design wind speed, which is used for the wind resistant building design, is the value estimated for the return period of 100 year to extreme wind speeds. The probabilistic analysis of extreme wind speeds has been performed irrespective of wind direction. It was assumed then, that the design value of the wind speed may occur from any direction with the same probability. However, it is necessary for estimating habitability of wind-induced building vibration to use wind speeds of short return period and to consider directionality. This study deals with an analysis of directional wind speeds for short return period in Korea. The 32 meteorological stations having daily maximum wind speeds records from 1987～1996 years were selected for the directional analysis. We classified a daily maximum wind data from 1987 to 1996 by sixteen wind direction (N～NNW) and evaluated frequency of wind direction. It can be seen that the probability distribution of directional wind data is to be fitted Weibull distribution in Korea. Directional wind speeds for 1, 5, 10 year return period were compared to that wind speeds which is not considering it's directions. It can be seen that the value of directional wind speeds for each return period were estimated 50%～100% of non-directional wind speeds. The result of this study should be used to estimate the habitability to wind-induced building vibration. |