EFFECTS OF NONLINEAR DAMPING AND TIME CONSTANT ON WIND-INDUCED RESPONSES OF A 79-STOREY TALL BUILDING

摘要

The full-scale tests on wind-induced response of Di Wang Tower during several typhoons were conducted during the past few years. The amplitude-dependent nonlinear damping ratios for this tall building were obtained from these full scale tests. Meanwhile a Monte Carlo simulation procedure was adopted in this study to generate the time series data of local fluctuating along-wind force acting on this building. The wind-induced response of this building was numerically analyzed in time domain based on the generated local fluctuating wind force and the established finite element model. The effect of nonlinear damping on the wind-induced response was evaluated under different load cases. Finally the effect of time constant on the wind-induced response was analyzed by comparing the time domain analysis results with those from conventional spectral analysis method. Some conclusions resulted from this study may be helpful to the wind resistant design of tall building structures.