3D Finite Element Modeling via Smeared Crack Approach of RC Beams after Exposure to High Temperatures

فاقد چكيده فارسي

This paper tries to study the effect of previously heated concrete on structural behavior of reinforced concrete beams through three dimensional analyses. In the first part, a constitutive model was developed for plane concrete heated up to the desired levels. The concrete model developed in VISUAL FORTRAN computer language follows continuum damage theory to present a damage value separately for each microplane. From the results of concrete model compared with experimental evidences, stress-strain diagrams were extracted under uniaxial compression/tension loading states. The stress-strain curves of heated concrete have been directly utilized to introduce concrete behavior during non-linear finite element analysis of a reinforced concrete beam. Through the second part, the commercial code ANSYS was incorporated and response of the beam was studied for cracking and nonlinear behavior of steel, concrete. In conclusion crack growth of the beam simulated according to micro-plane model data in different temperatures have been presented.