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Faculty of Architecture, Civil Engineering and Geodesy, University of Banja Luka , Banja Luka , Bosnia and Herzegovina
Faculty of Civil Engineering Subotica, Kozaračka 2a, 24000 Subotica,, University of Novi Sad , Novi Sad , Serbia
In this paper, a new approach for determining the stress-strain state that incorporates spatial variations in porosity into the elasto-viscoplastic analysis of a thick-walled concrete cylinder subjected to long-term loading is presented. This approach uses rheological dynamic theory (RDT), based on the principles of mass and energy conservation. By coupling local creep-induced stress with porosity at the finite element level, the model predicts modified stress fields and changes of the elasto-viscoplastic boundary, resulting in a more accurate representation of the elastic and viscoplastic zones. The results showed that RDT provided a reliable model for estimating rheological parameters of material after exposure to long-term loads.
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