Abraham Gebre (PhD)Awet Tekle2023-12-142023-12-142023-06http://etd.aau.edu.et/handle/123456789/938The use of composites to strengthen and renew infrastructure is widely accepted around the world. Traditional methods of strengthening structures are expensive, time-consuming, and la-bour-intensive. Carbon fiber reinforced polymers (CFRP) are in use nowadays because they are light and strong materials that are also corrosion-resistant. Carbon Fibre Reinforced Poly-mers (CFRP) plates are regarded as a suitable alternative to strengthen girders due to their high tensile strength and good modulus of elasticity. In this study, prestressed concrete girders were loaded with a static load and reinforced with carbon fiber reinforced polymers (CFRP) sheets. The carbon fiber reinforced polymer (CFRP) plates and sheets used in this study were adhered to the tensile sections of pre-stressed concrete girders with epoxy adhesive. The results, ob-tained from ANSYS numerical analysis, showed that using carbon fiber reinforced polymer (CFRP) plates with epoxy adhesive increases the load carrying capacity of a prestressed girder bridge by 11.4%, 22.36%, and 27.63% when it is strengthened with one layer, two layers, and three layers of carbon fiber reinforced polymers (CFRP), respectively.en-USStrengthening; steel–concrete; ANSYS and compositeThesis