Uniaxial Model for Concrete under Variable Temperature and Stress
Publication: Journal of Engineering Mechanics
Volume 119, Issue 8
Abstract
A plasticity model using a strain‐rate formulation is presented to describe the uniaxial response of concrete when subjected to combined thermal and mechanical actions. The total strain rate is resolved into three individual components: mechanical strain, thermal strain, and transient creep strain. Each component is formulated individually. The mechanical strain rate is assumed to consist of an elastic strain rate and a plastic strain rate, which itself is taken as temperature‐dependent. In describing the plastic strain rate, the nonlinear part of the uniaxial stress‐strain curves is assumed to be a quarter of ellipse, defined for a given temperature in the range 20°C–800°C. The model was first used to analyze uniaxial (experimental) data under variable load but isothermal conditions, and then to investigate the effect of a sustained load on the deformational response of a concrete specimen under heating. Thirdly, a set of experimental relaxation tests was studied, in which temperature and stress vary continuously under a zero total strain condition. Here, the importance of a variable temperature and stress, and the significance of the history, is demonstrated.
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Information & Authors
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Published In
Journal of Engineering Mechanics
Volume 119 • Issue 8 • August 1993
Pages: 1507 - 1525
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Feb 4, 1992
Published online: Aug 1, 1993
Published in print: Aug 1993
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