ANÁLISIS DINÁMICO DE MÁSTILES ARRIOSTRADOS 1
2006; Volume: 6; Issue: 1 Linguagem: Inglês
ISSN
1936-1483
AutoresSergio Preidikman, Julio C. Massa, Bruno A. Roccia,
Tópico(s)Structural Engineering and Vibration Analysis
ResumoA numerical approach capable of predicting the dynamic behavior of guyed towers commonly used for wireless communication, meteorological measurements, and recently, even for power transmission, is presented in this paper. In order to carry out numerical simulations in a simple way, the three/four-legged latticed mast is modeled as a beam-column standing on a set of massless, non-lineal springs which represent the guys. Because the inherent non-linear behavior of tall guyed masts, geometrics nonlinearities are included in the finite element procedure. A geometrical stiffness matrix is included to account for the influence of the axial force acting on the mast on the transverse vibrations of the guyed tower. The cables are idealized using the classic parabolic model, valid for small strain elastic catenaries. Self-weight and inertia of the cables are neglected. The legs, diagonals and horizontal members of the mast are modeled as a two-node, bi-dimensional elastic beam- column element with two degrees-of-freedom at each node. Nonlinear dynamic response is computed in the time domain using a predictor-corrector method to perform a step-by-step integration of the governing equations of motion. The results provided by the non-lineal model were compared with those obtained from the linearization commonly used in practice.
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