Abstract
Load induced thermal strains (LITS) are an integral part of the behaviour of concrete in fire; their existence has been well documented and modelled by different researchers. More thorough representation of LITS is needed to accurately represent their plastic constituents in finite element models. This paper develops a technique to allow the evolution of LITS in accordance with the rules developed in several academic models. The technique is implemented with a simple Drucker-Prager yield surface and the results assessed.
Highlights
Load induced thermal strain (LITS) is an integral part of the behaviour of concrete in fire
This approach allows the total strains developed due to LITS to be included in a finite element analysis
This paper presents a technique to allow the evolution of LITS in accordance with the rules developed in several academic material models [1,2,3]
Summary
Load induced thermal strain (LITS) is an integral part of the behaviour of concrete in fire. The existence of LITS has been well documented and modelled by different researchers. It is vital that this strain development is correctly represented in structural models, as the locked in strains due to LITS constituents are significant. Current methods of modelling LITS involve incorporating the strains into constitutive curves. This approach allows the total strains developed due to LITS to be included in a finite element analysis. This paper presents a technique to allow the evolution of LITS in accordance with the rules developed in several academic material models [1,2,3]. The technique is implemented with a simple Drucker-Prager yield surface and the results assessed
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