Vibration of tall buildings under wind loads

Resumo

The evaluation of the dynamic response of tall buildings exposed to wind loads is an important complex
subject that is usually treated through different simplify method which are addressed in this study. The first one is
Mario Franco’s “Synthetic Wind Method”, which allows simulating the fluctuation of the wind from the
superposition of harmonics obtained from a power spectrum of wind speed. It was also studied methods for the
assessment of dynamic torsional moments caused by turbulent wind, and its influence on the total dynamic
response of tall buildings. The torsional dynamic wind loads were simulated trough literature available power
spectra. All load methods were addressed on case studies which involved two different tall buildings modelled on
commercial software’s based on Finite Element Method. It was observed that reliability of the obtained results
depends strongly on the choosing of the method appropriate for the buildings geometry. Also, the disregarding the
floating torsional moments due to wind load in the dynamic analysis of tall buildings can lead to major error in the
human comfort analysis.