RESPONSE ANALYSES ON ALONG-WIND AND ACROSS-WIND VIBRATIONS OF TALL BUILDINGS IN TIME-DOMAIN

This study discusses the application of a numerical simulation techniq ue to estimate wind-induced vibrations of tall buildings. We simulated fluctuating wind forces acting on a tall building in along-wind and a cross-wind directions using the technique which was developed by Tamur a et al.(1988). The power spectrum of the fluctuating wind force in al ong wind direction is expressed as the product of the power spectrum o f the fluctuating windspeed and the aerodynamic admittance. While, in the case of the across-wind direction, the power spectrum of the lift force is approximated by a mathematical expression based on wind tunne l data. These techniques are proceeded to use for analyses of the alon g-wind and across-wind vibrations of tall buildings, estimating displa cement and acceleration. Further analyses of the response of a buildin g installed with a Tuned Mass Damper(TMD) are also carried out to exam ine its efficiency.