Applying pre-stressed Carbon Fiber Reinforced Polymers (CFRP) plate to steelconcretecomposite beams is considered an active strengthening technique that cancreate permanent internal stresses in the beam opposite to the internal strainingactions due to the service loads. This study presents a numerical analysis of steelconcretecomposite beams stiffened with pre-stressed CFRP plates. The pre-stressingeffect on CFRP plate is enforced in the finite element (FE) model as an initial stresson the solid element that used to simulate the strengthening plate and the epoxy isconsidered as a thin layer between CFRP plate and the steel flange. The deterministicand stochastic analysis is performed to obtain the long-term random responses of thestrengthened beams as well as plain beams due to the effect of shrinkage. In addition,the effect of CFRP plate rigidity and strengthening schemes are investigated. Byusing CFRP plates, strengthening can be achieved up to 25% for the system explored.During the post-elastic range, stiffness is improved when adding pre-stressed CFRPplates and deflection of strengthened beams is reduced by 20% in comparison to thereference beam at the ultimate capacity. Also, a slight drop in ductility occurs withthe addition of CFRP plates.
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