| Fiber Reinforced Polymer(FRP) has been widely used in the field of strengthening structures due to its advantages such as high strength-to-weight ratio and good fatigue properties. Near-surface Mounted(NSM) reinforcement is emerging as a latest strengthening techniques for reinforced concrete structures and is showing great prospect, as it offers some real advantages over externally bonded(EB) FRP reinforcement.Based on existing test data, this paper presents analysis of CFRP strips NSM flexurally strengthened RC beams using 3-D nonlinear element model which is implemented in ANSYS 10.0 and numerically simulate the whole process of load application. And then an extensive parameter influence analysis is given mainly focused on capacity, rigidity, ductility and failing modes. At last, different stress distributions of NSM strengthened RC beams are tentatively explored, and someresults not easily observed in tests are obtained.Following conclusions can be drawn: the NSM reinforcement improves the ultimate capacity and post-cracking rigidity; embedment length, width, thickness, elastic modulus, tension strength of CFRP and elastic modulus of groove filler have great influence on the flexural behavior of strengthened RC beams; normal stress distribution of FRP near the plate end is different from other region; the maximum shear stress of groove filler is on different location as the embedment length different. |
