Behavior Of Aramid Fiber Reinforced Plastic Strengthened Concrete Beam

As the critical node in the transportation network,bridge plays an important role in the guarantee of traffic capacity of the network.During the past decades,numbers of bridges have been built in China,occupying the first place of the world.After a long time operation,many bridges have been deteriorated and need to be strengthened.It would be beneficial for the decision making in bridge management to evaluate the performance of existing bridges which have been strengthened.Fiber reinforced polymer(FRP)is one of effective materials for strengthening of existing bridges.In this study,ultimate flexural capacity of the strengthened reinforced concrete beam have been analyzed.First of all,the theoretical models aiming at different kinds of damage pattern of AFRP reinforced damaged RC beams was established by considering the damage of materials,inter-laminar stresses of AFRP sheets was analyzed.Secondly,the finite element models(FEM)of AFRP strengthened beams were established to stimulate their bearing capacities,deformations and inter-laminar stresses.Parameter analysis was also done to study the influence of initial loading,steel bar arrangement and sheets' depth on the static mechanical properties of reinforce beams.Finally,the uncertainties involved in the design and construction of reinforced concrete beam and strengthening process were considered in this study.Based on the Monte-Carlo simulation method,taken the moment of beam without any damage as benchmark,failure probability of the existing beam and strengthened beam were evaluated.