Buckling and Second-Order Effects in Dual Shear-Flexural Systems
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Volume 134, Issue 11
Abstract
Dual systems consisting of two shear-flexural structures are often used in high-rise buildings. This paper presents a second-order analysis of such dual systems, in which closed-form solutions are derived for the lateral flexural and shear displacements, as well as for the bending moments and shear forces in the two structures. The buckling of the dual system is also investigated. It is found that the total buckling load is a simple summation of the buckling loads of the two component structures when they act independently, and that it is independent of the distribution of the vertical loads amongst the two structures. A simple formula for the amplification factors is proposed for use in routine design. The second-order theory developed in this paper is used to investigate the amplification factors for the lateral displacements and bending moments in a typical shear-flexural structure. It is shown that the amplification factors determined from the proposed formula are in good agreement with those obtained by the more rigorous second-order analysis in most cases. It is also found that the various amplification factors are independent of the distribution of the vertical loads among the two structures.
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Acknowledgments
The work in this paper was supported financially by the Chinese National Foundation of Natural Science under Grant No. 50578140 awarded to the first writer, as well as partly by the Australian Research Council through Discovery Projects awarded to the second, third, and fourth writers.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 11 • November 2008
Pages: 1726 - 1732
Copyright
© 2008 ASCE.
History
Received: May 7, 2007
Accepted: Mar 5, 2008
Published online: Nov 1, 2008
Published in print: Nov 2008
Notes
Note. Associate Editor: Keith D. Hjelmstad
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