Nonlinear Finite Element Analysis of Damaged and Strengthened Reinforced Concrete Beams

Abstract

Bending test of seven reinforced concrete beams are modeled in finite element program to validate the modeling strategies by comparing the structural response of the beams. Three beams in the set are pre-damaged and strengthened with fiber reinforced composites before the bending tests. Cracks are implemented into the model by inserting geometrical discontinuities to represent the pre-damaged beams. Parametric variables such as crack width, length and interval are chosen to simulate different pre-damage levels. Once the proposed modeling strategies are validated by real experimental tests then 196 finite element models are created to study the effects of pre-damage levels on the moment capacity of reinforced concrete beams repaired with CFRP. Results indicate that inclusion of pre-damage levels by means of cracks into the cross sections have significant effect on beams moment capacity.Keywords: reinforced concrete beams, FRP, finite element, crack, nonlinear analysis, concrete damaged plasticity. Reference to this paper should be made as follows: Aktas, M.; Sumer, Y. 2014. Nonlinear finite element analysis of damaged and strengthened reinforced concrete beams, Journal of Civil Engineering and Management 20(2): 201-210. http://dx.

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Evaluation of calculation methods used for estimating the ultimate moment resistance of bridge decks reinforced with frp bars

“…Additionally to reinforcement bars, wires and ropes, FRP can be used in the form of strips, sheets and lamellas. FRP reinforcement can also be applied not only for reinforcing new concrete constructions as internal reinforcement, it can also be used in strengthening the structures as external reinforcement (Aktas, Sumer 2014;Barris et al 2012;Benzaid, Mesbah 2014;Daugevičius et al 2012;Fayyadh, Razak 2014;Lale Arefi et al 2014;Lapko, Urbanski 2015;Marčiukaitis et al 2007;Meisami et al 2013;Mostofinejad, Ilia 2014;Mostofinejad, Moghaddas 2014;Nelson, Fam 2014;Pakrastinsh et al 2006;Serdjuks et al 2003;Skuturna, Valivonis 2014a;Sprince et al 2013;Sundarraja, Prabhu 2013;Szolomicki et al 2015;Valivonis et al 2014). FRP reinforcement, as compared to steel, is lighter, resistant to corrosion, has a higher tensile strength, and is transparent to magnetic fields and electrically nonconductive.…”