Fiber Reinforced Polymer(FRP), as a perfect material for strengthening and retrofitting, 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. A new technology of strengthening structures with near-suface mounted FRP has been proposed by researchers. The beams are strengthened through inserting FRP bars or strips into grooves first cut at the tension surface. It’s one of the latest and most promising technology for increasing flexural and shear capacity of a deficient reinforced concrete(RC) member effectively.Based on the bending test results of32RC beams, this paper studies the failure process, the flexural performance, the failure modes and the ultimate load of the RC beams reinforced with near surface mounted CFRP strips, particularly on the parameters of the different strengthening modes with CFRP strips, the different lengths of CFRP, the different areas of CFRP strips, the different loading modes, the different ratio of reinforcement and the different section heights of RC beams.Useful constructions for the test results and the formulas calculating the maximal CFRP strain are made by the experimental results.This paper presents the analysis of CFRP strips NSM flexurally strengthened RC beams using3D nonlinear model which is implemented in ABAQUS and numerically simulate the whole process of load application. Following conclusions can be drawn: flexural capacity and rigidity of RC beams strengthened with NSM CFRP strips can be raised a lot, and the failure modes may be analyzed; At last, different stress distributions of NSM strengthened RC beams are tentatively explored. The finite analysis scheme and some concluding results may be useful for future in-depth research and practical engineering applications. |