Abstract

This paper shows the map of Japan representing basic wind speeds which were derived by using annual maximum wind speeds observed at weather stations in Japan. The basic wind speeds shown in the map are 100-year recurrence values for the 10-minute mean wind speeds at an altitude of 10 m above a flat and open country. Annual changes of terrain roughness caused by the urbanization of regions peripheral to the weather stations were taken into special consideration. The annual maximum wind speed data were homogenized in consideration of the annual changes of terrain roughness. The results of this analysis are employed in the "Recommendations for Loads on Buildings", compiled by the Architectural Institute of Japan.

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