Stress Distribution in Reinforced Concrete Sections Subjected to Biaxial Loading


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Title: Stress Distribution in Reinforced Concrete Sections Subjected to Biaxial Loading

Author(s): L. Lachance

Publication: Journal Proceedings

Volume: 77

Issue: 2

Appears on pages(s): 116-122

Keywords: axial loads; bending moments; biaxial loads: compression; linear programming; reinforced concrete; strength; stress analysis; stress-strain dia-gram;structural analysis; theories.

Date: 3/1/1980

A theory is developed for the nonlinear or linear analysis of arbitrary reinforced sections subjected to biaxial loading. The accuracy of the theory is verified by comparison with known uniaxial non-linear analyses of reinforced concrete sections of symmetrical square and L shapes, and with classical linear theory based on principal moments of inertia for unsymmetrical sections. Three basic shapes of concrete stress-strain diagrams are considered for three allowable compressive strains, which give nine different types of concrete stress distribution for use in analyzing various reinforced concrete sections. A comparative study of the results indicates that the factor which most influences ultimate biaxial bending strength and curvature is the allowable concrete compressive strain. The shape of concrete stress distribution has little effect on the section behavior.