Numerical modeling of the experimental test for shear strengthened of fire damaged high strength lightweight RC beams with SIFCON jacket

Abstract

The behaviour of concrete structures when exposed to fire is essential because fire represents an excessive loading and critical structural case for any concrete structure. This paper discusses the adopted procedure for modelling and simulation of concrete beams that experimentally tested in the lab. Through using of ABAQUS program, a finite model of lightweight reinforced concrete beams was carried out under realistic fire circumstances. 14 Beam specimens with lightweight high strength types, before and after firing up to 600°C, and improvement with SIFCON jacketing technique, were simulated and compared with the experimental results. For both the displacement at mid span and the maximum load carrying capacity of the specimens, the absolute error between experimental and numerical values was determined. From the results, it can be seen that the minimum and maximum determined absolute error for specimens’ load carrying capacity was about 0.521% and 15.61%, respectively. on the other side, minimum and maximum determined absolute error for specimens’ displacement corresponded to the max load were 0.42% and 11.42%, respectively. accordingly, and since the estimated errors less than 15%, it can be said that the performed simulation process was accurate and successful when compared with other researchers’ studies. As a result, it was found that there is an agreement between the practical and theoretical findings of the study, and a helpful tool for predicting failure in the event of a fire occurrence is provided.