A Thermo-plastic Damage Model For Cyclic Loading Of Concrete At Elevated
Temperatures
Author(s)
W. Nechnech, F. Meftah & J.M. Reynouard
Abstract
A thermo-plastic damage model for cyclic
loading of concrete at elevated temperatures
W Nechnech\ F. Meftah^ & J.M. Reynouard*
Institut National des Sciences Appliquees de Lyon, France.
^Laboratoire Genie Civil et Urbanisme,
Abstract
In this paper a new thermo-plastic damage model for plain concrete subjected to
combined thermal and cyclic loading is developed using the concept of plastic-
work-hardening and stiffness degradation in continuum damage mechanics. Two
damage variables are used, one for mechanical action and the other for thermal
action. The concrete model is based on the non-associated flow theory of
plasticity with a scalar hardening parameter, a multi-criteria yield function.
Further, thermo-mechanical interaction strains have been introduced to describe
the influence of mechanical loading on the physical process of thermal expansion
of concrete. The constitutive relations for elastoplastic responses are decoupled
from the degradation damage responses by
Keywords
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