Complete Triaxial Stress-Strain Curves for Concrete

by Shuaib H. Ahmad, Asst. Prof.; Dept. of Civ. Engrg., North Carolina State Univ., Raleigh, N.C.,
Surendra P. Shah, (M.ASCE), Prof. of Civ. Engrg.; Dept. of Civ. Engrg., Northwestern Univ., Evanston, Ill. 60201,

Serial Information: Journal of the Structural Division, 1982, Vol. 108, Issue 4, Pg. 728-742

Document Type: Journal Paper


A method to predict the ascending and the descending parts of stress-strain curve of concrete subjected to triaxial compressive stresses is presented. The proposed analytical stress-strain relationship depends on the values of the three principal stresses and strains at the ultimate compressive strength. A criterion to predict the triaxial compressive strength is proposed, which is sensitive to all three stress invariants. To enable predictions of the post-peak stress-strain relation, experiments were conducted on concrete confined by steel tube. Concretes with different compressve strengths were confined by steel tubes of varying thicknesses. The predicted stress-strain curves compared favorably with the available experimental data on uniaxial, biaxial, and triaxial compression.

Subject Headings: Compressive strength | Compression | Triaxial loads | Stress strain relations | Curvature | Concrete | Stress analysis | Steel columns

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