Uniaxial Model for Concrete under Variable Temperature and Stress
- 1 August 1993
- journal article
- Published by American Society of Civil Engineers (ASCE) in Journal of Engineering Mechanics
- Vol. 119 (8) , 1507-1525
- https://doi.org/10.1061/(asce)0733-9399(1993)119:8(1507)
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.Keywords
This publication has 10 references indexed in Scilit:
- Plasticity models for the biaxial behaviour of concrete at elevated temperatures, Part II: Implementation and simulation testsComputer Methods in Applied Mechanics and Engineering, 1992
- Plasticity models for the biaxial behaviour of concrete at elevated temperatures, Part I: Failure criterionComputer Methods in Applied Mechanics and Engineering, 1992
- Analysis of concrete structures under thermal loadingComputer Methods in Applied Mechanics and Engineering, 1989
- Modeling of Combined Thermal and Mechanical Action in ConcreteJournal of Engineering Mechanics, 1987
- Concrete model with normality and sequential identificationComputers & Structures, 1987
- Effects Of Biaxial Loading On The High Temperature Behaviour Of ConcreteFire Safety Science, 1986
- Transient thermal strain of concrete: literature review, conditions within specimen and behaviour of individual constituentsMagazine of Concrete Research, 1985
- The high temperature behaviour of concrete under biaxial conditionsCement and Concrete Research, 1985
- On the multiaxial behaviour of concrete exposed to high temperatureNuclear Engineering and Design, 1983
- Effect of temperature on steel and concrete for PCRV'sNuclear Engineering and Design, 1982