건축물의 주골조 설계용 풍향계수의 추정

Abstract

The types of wind in Korea shall be divided into Typhoon, Frontal system storm and Monsoon. Korean peninsula has geographical characteristics both having many mountains and surrounding three sides by sea. Because of these, the wind speed presents different values to wind direction in each region. For the wind-force resisting design of buildings, wind speed for the 100 year's return period defined in KBC (Korean Building Code) 2016 shall be used at all directions. KBC2016 does not take into account the wind directional effect. Therefore, wind loads evaluated by KBC2016 may be somewhat conservative. In this paper, the 10-minute mean wind speed date at 16 wind direction in 10 regional weather stations were collected, and the wind speeds for 100 year's return period at 16 wind directions were evaluated. To homogenize the collected wind data, the effective height has been considered for each wind direction, and both the gust factor method and the visual measurement method were used to judge the surface roughness category. Gumbel's distribution was has been selected to estimate the wind speed for 100 year's return period at 16 wind directions. Empirical exceed probability was used Hazen method. Compatibility both Gumbel's distribution and Hazen plot was judged by conformity assesment function. Based on these, wind directional coefficients at each region were evaluated. By comparing the wind directional coefficient each regions, the characteristics of the wind speed both each region and each wind direction were discussed.