Dynamic wind pressures acting on a tall building model — proper orthogonal decomposition

Abstract

Dynamic wind pressures acting on buildings are complicated functions of both time and space. Earlier studies have applied the proper orthogonal decomposition (POD) technique to such random wind pressure fields to identify hidden deterministic structures. In this study, the POD technique is applied to fluctuating wind pressures acting on a tall building model, and the following facts are found: the along-wind and across-wind forces can be approximated by only a few dominant modes, while the torsional moment requires approximately 10 modes; and the wind-induced response of a tall building has a maximum evaluation error of less than 6% with the reconstruction of the dominant modes.