Wind loads on tall buildings considering directionality

摘要

In order to evaluate the wind load effect considering the wind speed directionality, the wind speed probability and the directional wind speed-load effect relationship should be known. Because of the 'hidden' values problem and the rarity of strong typhoons, the nonexceedance probability can not be evaluated from the database of daily maximum wind speeds with their wind directions for some decades. This paper proposes improved typhoon simulation, the so-called POD-based pressure model and hybrid use of observed records and calculated values. Directional wind speed probabilities are evaluated using an improved method for typhoon winds and a statistical method for non-typhoon winds. Wind load effects of tall buildings are calculated on the basois of directional wind speed probabilities. The wind load effects vary according to the building's orientation. The maximum load is slightly less than the non-directional value. The minimum is 60 to 80% of the non-directional value. A longer side ratio of the building plan shows a larger load variation with changing orientation.