Improved Formulation in Mixed-Based State-Space Approach for Large Displacement Inelastic Analysis of Frames
Publication: Journal of Engineering Mechanics
Volume 137, Issue 3
Abstract
In this research, an enhanced flexibility- (force-) based formulation is developed for a shear deformable beam-column element by using force interpolation functions. The development is derived from Reissner’s exact stress resultant theory and its finite strain field for a Timoshenko frame element. Here, the state-space approach is applied, and the differential-algebraic equation system, consisting of a conservation global system and local constitutive equations, is formed and solved simultaneously. To improve the element’s accuracy, a polynomial-based displacement field approximation is implemented to evaluate the element flexibility matrix. The proposed technique is verified by nonlinear examples, including material and geometric nonlinearities, to examine its precision. It is shown that shear-locking is alleviated by the element; therefore, shear effects can easily be considered. The proposed method is more reliable and accurate than general displacement-based methods and existing force-based formulations.
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Acknowledgments
The writer appreciates Professor Sivaselvan for reviewing this paper and for his effective comments. This work is partially sponsored by Rayhaneh Pharmaceuticals Company which is gratefully acknowledged.
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Published In
Journal of Engineering Mechanics
Volume 137 • Issue 3 • March 2011
Pages: 196 - 204
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jan 4, 2009
Accepted: Aug 27, 2010
Published online: Sep 2, 2010
Published in print: Mar 1, 2011
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