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Structural Engineering and Mechanics
  Volume 46, Number 6, June25 2013, pages 869-886

Experimental investigation of the large amplitude vibrations of a thin-walled column under self-weight
Paulo B. Gonçalves, Daniel Leonardo B.R. Jurjo, Carlos Magluta and Ney Roitman

    This work presents an experimental methodology specially developed for the nonlinear largeamplitude free vibration analysis of a clamped-free thin-walled metal column under self-weight. The main contribution of this paper is related to the developed experimental methodology which is based on a remote sensing technique using a computer vision system that integrates, on-line, the digital image acquisition and its treatment through special image processing routines. The main importance of this methodology is that it performs large deflections measurements without making contact with the structure and thus, not introducing undesirable changes in its behavior, for instance, appreciable changes in mass and stiffness properties. This structure presents, in most cases, highly non-linear responses, which cannot be reproduced by conventional finite-element softwares due, mainly, to the simultaneous influence of geometric and inertial non-linearities. To capture the non-linearities associated with large amplitude vibration and be able to describe the buckling process, the structure is discretized as a sequence of jointed coupled elastic pendulums. The obtained numerical results are favorably compared with the experimental ones, in the preand post-buckling regimes.
Key Words
    nonlinear vibrations; large deflection behavior; softening phenomenon; dynamic experimental analysis; digital image processing; non-contact displacement measurements
Paulo B. Gonçalves : Department of Civil Engineering, Catholic University, PUC-Rio, 22453-900, Rio de Janeiro, RJ, Brazil
Daniel Leonardo B.R. Jurjo, Carlos Magluta and Ney Roitman : Department of Civil Engineering, Federal University of Rio de Janeiro, COPPE/UFRJ, Rio de Janeiro, RJ, Brazil

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