Computational Modeling of Punching in Reinforced Concrete Slabs Subjected to High Temperatures
DOI:
https://doi.org/10.70567/mc.v41i2.7Keywords:
Reinforced Concrete Flat slabs, Punching, High Temperatures, Constitutive modelingAbstract
This work focuses on the analysis of the punching strength of Reinforced Concrete flat slabs. Punching shear failure is characterized by being extremely fragile. The exposure to a fire can substantially reduce punching strength due to the degradation of the mechanical properties of the materials. In this work, the evolution of the punching strength of a slab-column system against exposure to high temperatures is studied using a 3D finite element model implemented in ABAQUS. To represent the thermomechanical behavior of concrete, a temperature-dependent damage plasticity model is used, which is calibrated and then validated with experimental data extracted from the literature. The results obtained allow to estimate the drop in punching strength with the increase of temperature and to perform a sensitivity analysis of the different parameters involved in the model.
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