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Shock and Vibration
Volume 20, Issue 6, Pages 1093-1101

Some Comments on the Nonlinear Dynamics of a Portal Frame under Base Excitation

Aline Souza de Paula,1 José Manoel Balthazar,2 and Jorge Luis Palacios Felix3

1Department of Mechanical Engineering, Universidade de Brasília, Brasília, DF, Brazil
2Departamento de Estatística, Matem√°tica Aplicada e Computação-UNESP, Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista, Rio Claro, SP, Brazil
3Depto de Engenharias, Universidade Federal do Pampa, Campus Alegrete, RS, Brazil

Received 8 October 2013; Accepted 8 October 2013

Copyright © 2013 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a nonlinear dynamic analysis of a flexible portal frame subjected to support excitation, which is provided by an electro-dynamical shaker. The main goal of this study is to investigate the dynamic interactions between a flexible portal frame and a nonlinear electrical support excitation. The numerical analysis shows a complex behavior of the system, which can be observed by phase spaces, Poincaré sections and bifurcation diagrams.