A new analytical model for the prediction of concrete response under uniaxial
compression and its experimental verification is presented in this paper. The
proposed approach, referred to as the rheological-dynamical continuum damage
model, combines rheological-dynamical analogy and damage mechanics. Within
the framework of this approach the key continuum parameters such as the creep
coefficient, Poisson?s ratio and damage variable are functionally related.
The critical values of the creep coefficient and damage variable under peak
stress are used to describe the failure mode of the concrete cylinder. The
ultimate strain is determined in the post-peak regime only, using the secant
stress-strain relation from damage mechanics. The post-peak branch is used
for the energy analysis. Experimental data for five concrete compositions
were obtained during the examination presented herein. The principal
difference between compressive failure and tensile fracture is that there is
a residual stress in the specimens, which is a consequence of uniformly
accelerated motion of load during the examination of compressive strength.
The critical interpenetration displacements and crushing energy are obtained
theoretically based on the concept of global failure analysis. [Projekat
Ministarstva nauke Republike Srbije, br. ON 174027: Computational Mechanics
in Structural Engineering i br. TR 36017: Utilization of by-products and
recycled waste materials in concrete composites for sustainable construction
development in Serbia: Investigation and environmental assessment of possible
applications]
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