Dynamic along wind forces on tall buildings were estimated based on the results of the force balance tests carried out in the turbulent boundary layer wind tunnel. The empirical formula for static and dynamic wind forces were proposed. The dynamic wind forces estimated by the formula were much greater than the values given in 'Recommendation of Loads on Buildings (AIJ)'. It is considered that this large discrepancy comes from the over-estimation of the fluctuating coefficient of overturning moment in the empirical formula. When the fluctuating coefficient of overturning moment is corrected based on the wind tunnel results in the paper, the dynamic along wind forces estimated by the empirical formula are as same as the values given in the recommendation.
