Nonlinear Seismic Analysis of Circular Concrete-Filled Steel Tube Members and Frames
Publication: Journal of Structural Engineering
Volume 138, Issue 9
Abstract
Accurate nonlinear formulations are necessary for the assessment of structures under seismic and other extreme loading. In this work, a three-dimensional distributed plasticity beam element formulation for circular concrete-filled steel tubes has been developed for nonlinear static and dynamic analyses of composite seismic force resisting systems. A mixed basis for the element formulation was adopted to allow for accurate modeling of both material and geometric nonlinearities. The formulation utilizes uniaxial cyclic constitutive models for the concrete core and steel tube that account for the salient features of each material, as well as the interaction between the two, including concrete confinement and local buckling of the steel tube. The accuracy of the formulation was verified against a wide variety of experimental results. The verification confirms the capability of the formulation to accurately produce realistic simulations of element and frame behavior.
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Acknowledgments
This material is based on work supported by the National Science Foundation under Grant Nos. CMMI-0619047 and CMMI-0530756, the American Institute of Steel Construction, and the University of Illinois at Urbana-Champaign. The writers would like to thank Professor Roberto T. Leon from the Georgia Institute of Technology and Tiziano Perea from Universidad Autónoma Metropolitana, who led the experimental research reported herein from the MAST Laboratory and who provided advice throughout this research. Cenk Tort from Miteng Mitaş Engineering assisted in the model development. The support and advice of Tom Schlafly from the American Institute of Steel Construction is appreciated.
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Information
Published In
Journal of Structural Engineering
Volume 138 • Issue 9 • September 2012
Pages: 1089 - 1098
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jun 22, 2010
Accepted: Nov 30, 2011
Published online: Dec 2, 2011
Published in print: Sep 1, 2012
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