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arXiv · 1401.1152

Hygro-thermo-mechanical analysis of spalling in concrete walls at high temperatures as a moving boundary problem

Michal Beneš·Radek Štefan
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Abstract

A mathematical model allowing coupled hygro-thermo-mechanical analysis of spalling in concrete walls at high temperatures by means of the moving boundary problem is presented. A simplified mechanical approach to account for effects of thermal stresses and pore pressure build-up on spalling is incorporated into the model. The numerical algorithm based on finite element discretization in space and the semi-implicit method for discretization in time is presented. The validity of the developed model is carefully examined by a comparison between experimental tests performed by Kalifa et al. (2000) and Mindeguia (2009) on concrete prismatic specimens under unidirectional heating of temperature of 600 ${\deg}$C and ISO 834 fire curve and the results obtained from the numerical model.

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Michal Beneš, Radek Štefan. 2014-01-06. Hygro-thermo-mechanical analysis of spalling in concrete walls at high temperatures as a moving boundary problem. https://doi.org/10.1016/j.ijheatmasstransfer.2015.01.050

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