Analysis of Reinforced Concrete Columns Subjected to Combined Axial, Flexure, Shear, and Torsional Loads
Publication: Journal of Structural Engineering
Volume 139, Issue 4
Abstract
This paper describes the implementation of a three-dimensional (3D) concrete constitutive model for fiber-based analysis of RC members subjected to combined loadings including torsion. The proposed model is formulated to address the interaction between the axial force, bidirectional shear, biaxial bending, and torsion. The shear mechanism along the beam is modeled using a Timoshenko beam approach with 3D frame elements with arbitrary cross-sectional geometry. The model considers the 3D equilibrium, compatibility, and constitutive laws of materials at the section and structural level. The concrete constitutive law follows the softened membrane model with a tangent-stiffness formulation. The emphasis of the paper is on evaluation of the effect of the different stress states on the global and local behavior of the member. The ability of the model to assess the ultimate strength, stiffness, energy dissipation, failure modes under 3D loading is evaluated by correlation of analytical results with experimental tests of RC specimens.
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Acknowledgments
The work presented in this paper was supported by funds from the National Science Foundation under Grant No. CMMI-0530737 and partially supported by the ASCE O.H. Ammann Research Fellowship. This support is gratefully acknowledged. The opinions expressed in this paper are those of the writers and do not necessarily reflect those of the sponsors.
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© 2013 American Society of Civil Engineers.
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Received: Jan 10, 2012
Accepted: Jul 20, 2012
Published online: Aug 11, 2012
Published in print: Apr 1, 2013
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