DYNAMIC WIND PRESSURES ACTING ON A TALL BUILDING MODEL - PROPER ORTHOGONAL DECOMPOSITION

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