Reinforced, Partially, and Fully Prestressed Slender Concrete Columns under Biaxial Bending and Axial Load
Publication: Journal of Structural Engineering
Volume 127, Issue 7
Abstract
An analytical model that determines the inelastic structural response, ultimate strength, and failure mode of reinforced concrete, partially prestressed concrete, and prestressed concrete slender columns of any cross section under biaxial bending and axial load is presented. The effects of rotational and lateral restraints at the ends are included, but the effects of shear deformations and torsional moments along the member are neglected. The proposed method uses (1) a nonlinear stress-strain relationship for the concrete; (2) a multilinear elastic-plastic relationship for the conventional reinforcement; (3) a modified Ramberg-Osgood function for the prestressed steel; (4) Gauss's integral method for equilibrium at the sectional level to generate the moment-axial load-curvature characteristics (i.e., M-P-ϕ diagrams) along the member; and (5) the finite-element method to evaluate the transverse deflections and second-order moments (P-δ and P-Δ effects) along the member. The proposed method can be utilized (1) to study the effects of creep, confinement, and tension-stiffening in the concrete and relaxation in the prestressed steel on the behavior, strength, ductility, and failure mode of slender concrete columns; and (2) to analyze prismatic and nonprismatic slender concrete columns of an arbitrary cross section under different end supports and bracing conditions. The biaxial bending behavior, strength, ductility, and failure mode of slender concrete columns can be obtained using a minicomputer, and as expected, they depend on (1) bracing and support conditions; (2) cross section and reinforcement layout along its span; (3) the stress-strain characteristics of the concrete and different reinforcements; and (4) the type and intensity of the applied loads. Three numerical examples are presented in detail to verify and show the effectiveness of the proposed method.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 127 • Issue 7 • July 2001
Pages: 774 - 783
History
Received: Mar 6, 2000
Published online: Jul 1, 2001
Published in print: Jul 2001
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