The Fatigue Behavior Of Concrete Beams Strengthened With NSM Prestressed CFRP Strips

In recent years, more and more fiber reinforced polymer(FRP) applications in reinforced concrete bridges and other long-term structures subject to fatigue loading reinforcement, FRP reinforcement the fatigue behavior of reinforced concrete bridges also get increasingly widespread attention. The Fatigue Behavior of Concrete Beams Strengthened with NSM Prestressed CFRP Strips is the emergence in recent years of new FRP reinforcement technology has the advantage of being embedded in the concrete slats FRP tank, and better adhesion properties of reinforcing structure can be achieved with no additional anchorage anchor and from the external environment. For the development of this technology, the paper has been studied near surface mounted CFRP prestressed beam technology by changing the size and grade of prestressed upper limit cycle fatigue analysis of two factors on the fatigue life of reinforced concrete beams and failure modes affected. Be modified by the existing model, deduced in the case without damaging the concrete groove wall, the specimen beam can withstand a maximum of CFRP prestressed rating.This paper conducted a series of research work on the Fatigue Behavior of Concrete Beams Strengthened with NSM Prestressed CFRP Strips as follows:(1) carried out two surface mounted CFRP prestressed concrete beams batten static test, we investigated the effects of prestressing level of reinforcement of bearing capacity and failure mode;(2) basis on two Surface Mounted CFRP prestressed beams batten fatigue test to study the reinforcement beam fatigue life and failure mode, the influence of prestressed reinforced grade of fatigue performance of the beam.(3) It is can be obtained that at different stages of the tensioned CFRP strips-concrete interfacial shear stress and its calculation method from the concrete-strips bilinear shear-slip model. According to the formula can get the maximum initial prestress applied on the CFRP strips.