Simple Formulation of Triaxial Concrete Behavior


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Title: Simple Formulation of Triaxial Concrete Behavior

Author(s): Kurt H. Gerstle

Publication: Journal Proceedings

Volume: 78

Issue: 5

Appears on pages(s): 382-387

Keywords: concretes; finite element method; octahedral stress; triaxial stresses;stress-strain relationships; structural analysis.

Date: 9/1/1981

An octahedral representation of the m ultiaxial stresses train relations for concrete, assuming isotropic, nonlinear behavior, is outlined, following an earlier study. A simplified formulation of the octahedral stress strain relations is suggested for general triaxial stress states, leading to linearly varying tangent bulk and shear moduli. A coupling modulus is introduced to account for volume changes due to stress deviation. The results of several triaxial tests, following different load histories, are used to verify the effectiveness of the formulation. Good correlation is obtained in most cases. The limitations of the method are discussed, and the need for additional tests is pointed out.