Dynamic stability of imperfect cable stayed masts
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Data
2010
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Resumo
Cable stayed masts are used in several engineering applications. In this work, the nonlinear
finite element method, using an updated Lagrangian formulation, is used to study the effect of
initial geometric imperfections on the non-linear vibrations of cable stayed masts subjected to axial
time dependent loads. The non-linear equations are solved using the Newton-Raphson method
associated to an arc-length technique and the Newmark method is used to calculate the time responses
of the system. Validation examples are presented and the influence of initial geometric imperfections
and cable tensioning is studied when stayed towers are subjected to different types of axial loads. The
Budianski´s criterion is used to study the loss of stability under sudden and harmonic loads. Obtained
numerical results show the great influence of both cable tensioning and cable positioning on the nonlinear
behavior of the system and could be used as a tool for an analysis of the nonlinear dynamics of
the structure previous to design.
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Palavras-chave
Cable-stayed structures, Dynamic instability, Non-linear oscillations, Non-linear finite element
Citação
N. DEL PRADO, Zenon J. G.; CARVALHO, Eulher Chaves; GONÇALVES, Paulo B. Dynamic stability of imperfect cable stayed masts. Mecánica Computacional, Santa Fe, v. 24, n. 7, p. 647-658, 2010.