| It can greatly improve the flexural performance of the recycled concrete when paste with a certain amount of FRP fiber. Carbon fiber reinforced composite material(CFRP) and Glass fiber reinforced composite materials(GFRP) are two kinds of materials for strengthening of the widely research and used in the wold for now. The CFRP has high tensile strength and young’s modulus but low elongation, poor ductility, and its destruction model is mostly brittle fracture, so it should not be directly used in the reinforcement engineering.GFRP,its fibre tensile strength and yang-style relatively low, but the elongation of GFRP materials is relatively high. The view of the existing research on hybrid materials of common reinforcement suggests that MFRP(area mixed with CFRP and GFRP within each half of the layer) and the CFRP/GFRP interlaminar hybrid fiber cloth reinforcement material, has the strength and elongation of positive hybrid effect, can effectively improve the CFRP material brittleness nature, make the flexural performance of reinforced material more fully.With the theory analyses for reinforcement mechanism of the tested beams with the single FRP materials and hybrid materials MFRP inside the layer and the mixed materials CFRP/GFRP between layers, in this paper I will use 6recycled concrete test beams reinfored with FRP fiber for bending test with static load method combined with ANSYS finite element simulation, research on the bending capacity of the beams reinforced with a layer of CFRP and GFRP,MFRP and the two layers of CFRP and GFRP and CFRP/GFRP fiber, the conclusions are as follows:(1)In the interior of the hybrid materials,the high elongation rate of the MFRP effectively prevent and improve the low elongation of CFRP, effectively improved the properties of a single FRP elastic and brittle materials.At the same time,under the effect of the coordinate deformation of the two kinds of composite fiber cloth, it can effectively improve structure interface performance, make the crackle stress distribution is more even, significantl avoid theinterface stripping damage which often happened in beams reinforced with a single FRP fiber, the bearing capacity and the ductility of the structure are significantly increased;(2)Studied the flexural performance of recycled concrete beams pasted with one layer of MFRP and two layers of CFRP/GFRP fiber by reinforcement structure bending test. The results showed that compared with the same amount of reinforcement of a singer sheet,the experimental beams reinforced with the mixed way can effectly improve the crack resistance and bearing capacity,and the stiffness of the beam were significantly improve and enhance.In the whole process of loading,the beams reinforced with MFRP and CFRP/GFRP fiber has the excellent properties which belongs to the two kinds of FRP fiber;(3)The finite element of ANSYS calculation results and actual test results meet perfectly, prove the correctness of the finite element modeling method,parametric analysis calculated the proportion of different reinforcement methods,it has a great increasement on the beams reinforcement effect,it can improve the efficiency of material utilization in the scope of the project application. |
