Stability of Sway-Inhibited Prismatic Columns Subjected to Internal Axial Loads
Publication: Practice Periodical on Structural Design and Construction
Volume 22, Issue 1
Abstract
Prismatic members subjected to internal axial loads exist widely in engineering applications. Because the effects of internal loads and end loads on stability are quite different, the traditional effective length method is not applicable. Engineers require an efficient and convenient method for solving the stability problem of such members. A two-bar model is proposed to illustrate the concept that the effect of compressive axial loads on the stability of sway-inhibited columns can be understood as a negative lateral stiffness. After obtaining the expression of negative lateral stiffness, a relationship between end loads and internal loads can be established so that the internal loads can be considered equivalent to end loads. Then, the column subjected to internal loads can be analyzed as a normal column (without internal axial loads), and the critical buckling load can be obtained easily with the Euler formula. Eigenvalue buckling analyses were performed to examine the proposed method, and the comparison results indicate it has high accuracy.
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Acknowledgments
The authors express their gratitude and sincere appreciation for the funding provided by the China Postdoctoral Science Foundation (Award No. 2014M552321) and Chongqing Postdoctoral Science Research Special Funding (Award No. Xm2014090).
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Published In
Practice Periodical on Structural Design and Construction
Volume 22 • Issue 1 • February 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 7, 2016
Accepted: Jul 26, 2016
Published online: Sep 1, 2016
Published in print: Feb 1, 2017
Discussion open until: Feb 1, 2017
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