Numerical Evaluation of Structural Behavior of the Simply Supported FRP-RC Beams
2012 (English)Report (Refereed)
The main problem of steel-reinforced concrete structures is corrosion of steel reinforcements which leads to premature failure of concrete structures. This problem costs a lot annually to rehabilitate and repair concrete structures. In order to improve the long-term performance of reinforced concrete structures and for preventing this corrosion problem, conventional steel bars in concrete can be substituted by Fiber Reinforced Polymer (FRP) bars. In this study the structural behavior and performance of the simply supported concrete beams reinforced with the FRP bars are numerically evaluated and compared with the conventionally steel-reinforced concrete beams. The commercial Finite Element program, ABAQUS, was used for this purpose and the ability of the Concrete Damage Plasticity constitutive model for concrete was investigated for modeling the non-linear behavior and fracture of the concrete material. Two different cases were considered for evaluating the structural behavior of FRP-reinforced concrete beams; case (a) effect of different types and ratios of reinforcements, and case (b) effect of different concrete qualities. For the first case, different reinforcement types (i.e., CFRP, GFRP, AFRP and steel bars) and various reinforcement ratios were considered and the concrete material assumed to be of normal strength quality (NSC). For the second case, it was assumed that the concrete for all the FE models has high strength quality (HSC) and hence, for comparing the results of the HSC and NSC models, the mechanical properties of the reinforcements were considered to be identical as the first case. The results of modeling are presented in terms of; moment vs. mid-span deflection curves, compressive strain in the outer fiber of concrete, tensile strain in the lower tensile reinforcement, cracking and ultimate moments, service and ultimate deflections, deformability factor and mode of failure. Finally, the results of simulations are compared with predictions of several design models including ISIS Canada Model, ACI 440-H and CSA S806-02 standards.
Place, publisher, year, edition, pages
Stockholm: Kungl. Tekniska Högskolan , 2012. , 99 p.
, Kungliga Tekniska Hoegskolan. Institutionen foer Byggkonstruktion. Trita-B K N. Examensarbete, ISSN 1103-42972010 → … ; 348
FRP bars, Finite Element Modeling, Normal strength concrete, High strength concrete, Design code, Corrosion, Civil engineering and architecture - Building engineering
Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik
Research subject Attractive built environment (AERI); Structural Engineering
IdentifiersURN: urn:nbn:se:ltu:diva-23310Local ID: 6717e198-be01-420b-98bd-44d7eb2d8cbaOAI: oai:DiVA.org:ltu-23310DiVA: diva2:996359
Upprättat; 2012; 20160201 (rasnil)2016-09-292016-09-29