The strategy is to simulate and study the damage growth in reinforced concrete slab. Numerical model was developed using Finite Element analysis package ABAQUS. This study includes the effect of material degradation with respect to temperature and geometrical nonlinearity. The study was carried out on square slab subjected to an ISO temperature for a time period of 90mintues. Support conditions considered for the study were a) supports at all sides and b) Supports at two opposite sides. Analysis predicts the temperature distribution, thermal response, mechanical response and intensity of damage. The slab supported on all four edges had better performance than the member with supports on two opposite edges due to the formation of tension ring phenomenon which enhances the performance of load carrying capacity but large deformation was observed. The slab supported at four sides had better resistance to collapse than the supports at two opposite edges. The pinned support condition at all sides had deflection greater than the fixed condition due to the effect of thermal gradient which resulted in increased thermal bowing. In case of fixed boundary condition the material degradation was dominant than the defection but for pinned support both material degradation and deflection had equal contribution for the intensity of damage. Development of tensile member action in slabs was predicted by analyzing the intensity and nature of damage in the member. The effect of restraint, both translational and rotation influence the thermo-mechanical behavior of the member.
M. K. Haridharan and Natarajan, C., “Numerical simulation of damage in reinforced concrete slab subjected to elevated temperature”, International Journal of Earth Sciences and Engineering, vol. 8, pp. 242-248, 2015.