Effect of the cable system on the static and dynamic stability of Guyed Towers

Resumo

This paper aims at understanding the influence of the cable setup on the static and dynamic stability of
the guyed towers. For such, simplified models consisting of mast and cables at different inclinations and guys level
are studied. The effect of these structural characteristics is studied through a nonlinear finite element model. First,
the influence of the configuration of the guys on the linear vibration frequencies and buckling load of the mast is
investigated considering the initial deformations and internal forces due to self-weight and cable pretension.
Coincident buckling loads and vibration frequencies happen for an even cable distribution around the tower. This
symmetry condition may lead to interactive buckling and internal resonance, increasing the effect of the geometric
nonlinearities on the response of the structure. Second, the nonlinear static and dynamic frequencies and buckling
loads are determined for the different guys configurations. The results show that the towers exhibit highly nonlinear
responses, even at low load levels. Thus, the geometric non-linear behavior must be considered in the design stage.
In addition, the results indicate the necessity of further investigation of the nonlinear dynamic response of these
structures for guys setup and mast dimensions used in actual towers.