Evaluation of Wind Load Factors for Seven Metropolitan Cities Based on Extreme Wind Analysis

초록

In this study, wind load factors were evaluated by using the power of the ratio between the wind speedsfor strength design and allowable stress design. The wind speeds of seven metropolitan cities (ie., Seoul, Incheon,Daejeon, Daegu, Ulsan, Gwangju, and Busan) were selected for this evaluation. For the analysis, annual maximumwind speeds were obtained from the Korea Meteorology Administration (KMA), and all the wind speed data usedin this study were corrected for the condition of 10m in height above flat open terrain by using surface roughnessand topographical effect models. Also, the Gumbel probability distribution was used for the analysis of extreme windspeeds with various return periods. From this analysis, it can be found that the current wind load factor of 1.3specified in Korean building code (KBC) 2009 may not be appropriate for the seven metropolitan cities, and a windload factor of 1.2 may be proper to be used with a nominal return period of 700 years for the wind speed of strengthdesign. It is also proposed in this study that a basic wind speed with a return period ranging from 500 to 1,000years with a wind load factor of 1.0 could be used for strength design. It is necessary to analyze wind load factorsfor all regions of Korea to generalize the results of the current study.

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