Revision of Basic Wind Speed Map of KBC-2009

건축구조기준(KBC-2009) 기본풍속도의 개선

Since 1970s, the rapid urbanization process by industrial and economic development 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 revise basic wind speed map of Korean Building Code 2009(KBC-2009) drowned by past meteorological data from 1951 to 1995. This paper proposes new basic wind speed map corresponding to a return period of 100 years in Korea. The values are established from data of annual-maximum 10-minute mean wind speeds collected at 68 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 100 years (it is called as basic wind speeds) were calculated for each region. The equivalent wind speed contour line to a return period of 100 years were drown up interval of 2m/s to the map of Korea. The basic wind speeds of this study were compared with those of KBC-2009, and the causes of wind speed up or down were described. The basic wind speed map of this study shall be used to revise that of KBC-2009.