Eeperimental Study On Flexural Behavior Of RC T Beams Strengthened With Textile Reinforced Mortar

The TRM system consists of textile meshes with textiles disposed along two orthogonal directions bonded to concrete surfaces with motar. Compared with the conventional FRP reinforcement technology of reinforced concrete structures, TRM system is easier to interpenetrated with concrete of base structure because of the use of mortar, besides, it has good temperature resistance and can work in underwater environment. When increase fabric network layer the mechanism of reinforcement layer transfer will be more complicated in strengthening reinforced concrete structure.This paper, by using double shear test to explore the can significantly improve the performance of concrete mortar viscosity interface approach, combined with the finite element analysis and theoretical analysis, preliminarily studies the strengthening of RC T beams through one contrast beam and 3 single AFRP-TRM reinforcement beams. The conclusions as follows:(1) Fiber bundle spacing and interface bonding strength between concrete and mortar have important influence on the performance of TRM reinforcement layer,TRM reinforcement layer will be Stratified by shear failure because small fiber bundle spacing. Lack of bond strength will lead to the reinforcement of concrete mortar interface layer stripping. Both damages belong to the category of the early damage and should be paid attention when design. Using steel plate to local anchor can significantly increase the bond strength between mortar and concrete, which can make the reinforcement layer and base structure work in good coordination, avoiding the happening of stripping(2) Monolayer AFRP TRM reinforcement has little influence on crack load and yield load because the reinforced layer is thinner and less dosage of fiber, and it can significantly improve the ultimate bearing capacity of the reinforced beam and does not significantly reduce its ductility if early failure does not occur in the case.(3) The finite element model can well simulate the structure performance of reinforcement beam on the premise that there is no slippage between aramid fiber and reinforcement layer as well as between mortar of reinforcement layer and concrete beam when premature failure doesn’t happen. The simulation value will be very different from test value when premature failure happens.(4)This paper doing theoretical derivations for the bearing capacity under different bending failure model of AFRP TRM reinforced RC T beams and it can be used as a reference for designers.