This is a cable-stayed tower designed to support the transmission antennas of the Unitel television channel. The tower consists of a steel tube 120 meters high and 30 centimeters in diameter, supported by steel cables that have a marked curvature in their catenary.

We have chosen to publish this project, not because it is a large structure, but because its design, analysis and construction presented significant structural challenges.

The structural problem is that a strongly curved cable presents a highly nonlinear behavior, since when wind forces act on it, the cable changes its shape and, therefore, has a different structural performance than the one it had with the initial geometry.

This nonlinear geometric behavior implies that the governing equations of the structure change over time and must be solved by advanced iterative numerical methods.

As a reference we can indicate that, at the maximum wind speed considered, the marked arrow of the catenary of the cables is completely inverted, presenting its curvature upwards; but remarkably during all this process the tower almost does not move.