Nonlinear Effect on Instability of Steel Columns under Dynamic Axial Loads
Publication: Journal of Structural Engineering
Volume 131, Issue 12
Abstract
The usual methods of investigating dynamic instability concentrate on elastic instabilities. These standard methods are limited because the strength of the structural component is independent of how much spread there is in the unloading and reloading of the yielding parts in the cross section and along the length of the component. Therefore, such methods are of limited practical use in assessing the performance of actual structures. This paper examines inelastic dynamic instabilities of steel columns alternately subjected to a steady axial force and an alternating dynamic axial force. The variable factors considered include the support condition and the frequency of the periodic axial force. During dynamic loading the amplitude behavior of the inelastic nonlinear column at the instability condition was found to be different from that of the elastic linear column at the resonance condition. It was also found that the presence of the material nonlinearity makes the instability regions different from those given by the solution of Mathieu’s equation for linear, elastic columns.
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Acknowledgments
The writers are grateful to Dr. S. Kuranishi, the Honorary Professor of Tohoku University, who initially enlightened this investigation. This paper is based on research sponsored by the Research Foundation under the Japan Kozai Club. Such financial aid is gratefully acknowledged. The findings and conclusions of this paper, however, are those of the wriders alone. The analysis was performed using the computer facility of the Information Processing Center in University of Ryukyu.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 131 • Issue 12 • December 2005
Pages: 1832 - 1840
Copyright
© 2005 ASCE.
History
Received: Apr 4, 2003
Accepted: Feb 28, 2005
Published online: Dec 1, 2005
Published in print: Dec 2005
Notes
Note. Associate Editor: Vinay Kumar Gupta
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