DYNAMIC ANALYSIS OF A GUYED MAST UNDER WIND LOAD WITH UNCERTAIN GUY TENSION

JORGE SEBASTIAN BALLABEN; MARTA ROSALES; RUBENS SAMPAIO

Viena

Congreso; 8th European Nonlinear Dynamics Conference; 2014

European Mechanics Society (EUROMECH)

The dynamic response of a guyed mast is analyzed under wind load action. The structural model consists of a beam-column model accounting for the second order effect due to axial loads and the presence of one guy. The guy is represented by an extensible cable governed by nonlinear equations. The wind velocity is derived considering temporal and spatial correlations. The resulting governing system is discretized using finite elements and, afterwards, a reduced order model is developed using two vibration modes as a basis. The wind load is obtained from a stochastic wind velocity field and it is derived using the Spectral Representation Method. Usually, the design tension changes during the structure service life affecting the system performance. As the guy pretension is a significant parameter in the behavior of guyed structures, its variation is a relevant issue. Hence an uncertainty quantification study appears necessary to obtain more realistic results of the behavior of the structure.