Alongwind static equivalent wind loads and responses of tall buildings. Part II: Effects of mode shapes

Abstract The reconsideration of the alongwind responses of tall buildings in part I is continued in the present paper. According to the literature to date, the effects of mode shape on the alongwind responses of tall buildings are taken to be negligible. In this paper, it is pointed out that only the effect of the first-mode displacement response has been included in the previous literature. Closed form expressions for the mode-shape correction are provided. The factor for the first-mode displacement response is in good agreement with that in the literature, and it can be neglected; but the factors for some other wind-induced responses, such as the base shear force, cannot be neglected. Finally a new correction procedure, which provides directly the static equivalent wind load, is developed.