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Experimental Validation of the Damage-Plasticity Modeling Concept for Normal Strength Concrete in Fire

MARTIN NEUENSCHWANDER, CLAUDIO SCANDELLA, MARKUS KNOBLOCH, MARIO FONTANA

Abstract


The softening behavior of concrete and its elastic stiffness evolution with increasing plastic straining can be investigated experimentally with strain-rate controlled uniaxial cyclic compression tests. Such tests at ambient temperature show that concrete exhibits the phenomenon of elastic stiffness degradation, which can be captured by damage-plasticity models. However, temperature-dependent concrete models implementing this modeling concept are often used today in structural fire engineering, despite the lack of experiment-based validation data. This paper presents the results of a preliminary study on the behavior of normal strength concrete under cyclic compressive loading at elevated temperatures. The experimentally derived evolutions of the elastic stiffness with plastic strain confirm (1) the suitability of the damage-plasticity modeling concept for concrete in compression at elevated temperatures and (2) provide novel calibration data

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