Abstract
The 192 m tall Brasilia Telecom Tower was designed in 1958 as part of the infrastructure of the new capital of Brazil. During its more than 55 years in service, a great number of accessories and antennas have been attached to the upper third of its height altering the lumped mass distribution and the wind loading on the tower structure. To evaluate the effect of such alterations, a comprehensive study of the aerodynamic behavior and structural stability was performed with the aid of a 3D computational model of the complete tower structure and short-term dynamic monitoring. This procedure allowed the structural model to be validated through the correlation between theoretical and experimental vibration frequencies and aerodynamic displacement amplitudes. The computational model was then used to obtain time-domain responses of the tower structure under the action of turbulent wind loading for various wind directions. It was found that the existing antennas and their supports caused a considerable increase in the aerodynamic forces and consequent response amplitudes. Two alternative solutions were then considered: structural reinforcement of elements and the installation of dynamic control devices. Both alternatives are described briefly, and their efficiency is discussed in light of the numerical results obtained.
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