SPECTRAL REPRESENTATION METHOD AND ITS APPLICATION TO WIND LOADS ON A GUYED TOWER

JORGE SEBASTIAN BALLABEN; MARTA ROSALES

Buenos Aires

Congreso; Congreso de Matemática Aplicada, Computacional e Industrial; 2013

Asociación argentina de matemática computacional e industrial

Guyed towers are structures typically employed for transmision of communication signals (TV, radio, mobile phones, etc.). Despite the large potential of adverse impact, dynamic actions, as wind and earthquakes, are not addressed in detail with exception of special cases (e.g.[1]). In this work, the dynamic response of a communication lattice guyed tower is analyzed under wind loads. The fluctuating wind component is obtained through the Spectral Representation Method (SRM) starting from a given Power Spectral Density function (psdf ). The temporal and spatial correlations are taken into account by finding the crossspectrum and introducing a coherence function. The method yields a temporal record of the fluctuating wind velocity for each desired height of the tower. Combined with the standard recomendations, the fluctuating wind pressure are applied on the tower mast. A discretization using finite elements is applied to an equivalent beam model for the lattice mass and the cables. Results are compared with a previous study in which a fully correlated load was assumed, i.e. the wind velocity was generated as a combination of harmonic deterministic functions.