Constitutive Behavior of Concrete Response to Multiaxial Load Histories

Scavuzzo, Robert

Graduate Thesis Or Dissertation

Constitutive Behavior of Concrete Response to Multiaxial Load Histories Public Deposited

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Citeable URL: https://scholar.colorado.edu/concern/graduate_thesis_or_dissertations/z890rv75g

Abstract

The prediction of the response and safety of a concrete structure under realistic loading conditions requires well defined constitutive relations for concrete subjected to arbitrary stress paths. The need for such information provided the basis for the research program described herein, which was intended to verify the suitability of a tangent formulation incorporating the use of four material moduli to describe material response.

Three series of multiaxial load history tests on plain concrete were conducted. The first series of tests provided information with regard to the effects of ioading and subsequent reloading on the bulk modulus along with the effects on the shear and the coupling moduli during deviatoric cyclic loading. These tests were performed along various cyclic stress paths in a number of deviatoric planes.

The second series of tests addressed the question of shear and coupling response to a reversal of stress deviation. From the results obtained from these load reversal stress paths the questions that arise concerning what constitutes loading, unloading, and reloading were studied and corresponding moduli were evaluated.

The third series of tests were circular stress paths whose results provided information about the effects of the third stress invariant and its significance in the prediction of principal strains associated with general load histories. These tests led to a study of the octahedral stress and corresponding strain angle along with the coupling relationships associated with each.

The experimental results obtained were used to calibrate and further develop the Simple Formulation proposed by Gerstle. The results show that the expressions for the bulk and the shear moduli that are incorporated in the Simple Formulation perform well within engineering accuracy for the stress paths performed in this study.

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