Amin Amirpour - Department of Civil Engineering, Faculty of Engineering, K. N. T University, Tehran
Ali Edalat Behbahani

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 developedfor plane concrete heated up to the desired levels. The concrete model developed in VISUAL FORTRANcomputer 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 ofheated 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

Non-linear finite element analysis, Micro-plane, Smeared crack approach, Elastic modulus, Reinforcement bars