Browsing by Author "Kaleab Teshome"
Item Parametric Study of Reinforced Concrete Beams Strengthened in Flexure by Fiber Reinforced Polymer(Addis Ababa University, 2025-05) Kaleab Teshome; Abrham Gebre (PhD)This study examines the effect of parameters on damaged Reinforced Concrete (RC) beams by using Finite Element Analysis (FEA) method. A software verification was conducted for the ABAQUS software by using an experimental result that is found in a literature review. The result shows that the FEA method gives approximately similar results to the experimental results. A Latin Hypercubic Sampling (LHS) method was used to create 32 samples that have 7 parameters. The FEA software was used to conduct a non-linear analysis for 32 samples of damaged RC beams that are strengthened with Carbon fiber Reinforced Polymer (CFRP) on the sides. The non-linear FEA results indicated that the stiffness of strengthened RC beams increased compared to un-strengthened beams. An equation that can be used to determine the extent of flexural strengthening that can be applied on the side of a damaged RC beams has been formulated by using regression analysis. According to a sensitivity analysis conducted to determine which parameter affects most amongst the parameters of degree of damage, ratio of length of CFRP to length of beam (LCFRP/Lbeam), ratio of width of CFRP to depth of beam (bCFRP/hbeam), number of layers of CFRP, compressive strength of concrete, yield strength of reinforcement and tensile reinforcement ratio (ρ) in a strengthening method, it is shown that the tensile reinforcement ratio (ρ) and the ratio of the length of the CFRP to the length of the beam (LCFRPP/Lbeam) have showed the highest direct effects on the load carrying capacity of strengthened RC beams. While the degree of damage showed an inverse effect. A verification of the equation was conducted using both strengthened and un-strengthened RC beams. The results showed that the equation should only be used for strengthened RC beams. The equation was also compared with other analytical equations provided by researchers and codes such as ACI 440.2R-08, Bai Y-L et al., Stephen Lee and CEB-FIP technical report [1, 2, 3, 4]. The comparison shows that the FIB technical report and the ACI440.2R-08 are in good agreement with the proposed equation. The comparison also showed that the proposed equation is conservative than the researches conducted by Bai Y-L et al. and Stephen Lee.