농업 관련 시설물의 내풍설계를 위한 기본풍속도의 제안

For estimating wind loads on agricultural facilities, basic wind speed at each region in Korea is required. However, basic wind speeds for wind resistant structural design of agricultural facilities are not established in Code. This paper proposes a basic wind speed map corresponding to a return period of 30 and 50 years for estimating wind loads on agricultural facilities in Korea. The rapid urbanization process by industrial and economic development since 19070s in Korea causes to a severe change of surface roughness and recent abnormal weather by global warming causes to increasing the intensity of strong wind and Typhoon. It is necessary to reflect those phenomena. Wind speed values are established from data of annual-maximum 10-minute mean wind speeds collected at 69 meteorological offices recent past 40 years from 1973 to 2012. They were standardized homogeneously to an altitude 10m above the surface roughness category C. Surface roughness category was determined by surrounding surface conditions of meteorological station in 1999 and 2012. The data were statistically reduced using extreme value analysis procedures based on Gumbel’s distribution, and the expected wind speeds corresponding to a return period of 30 and 50 years (it is called as basic wind speeds) were calculated for each region. The equivalent wind speed contour line to a return period of 30 and 50 years were drown up interval of 2m/s to the map of Korea. The basic wind speed map of this study shall be used to estimate wind loads on agricultural facilities.