| Based on the experiment of seven column-beam joints under low-cycle reversed load, the seismic behavior were studied by finite element method in this paper. First, all of column-beam joints were damaged, then the cracks in them were filled up. Second, these column-beam joints were strengthened by FRP sheet. The effects of strengthening way, fiber type and layers on the hysteretic curve, skeleton curve, and ductility coefficient and power ratio index of the seismic performance of reinforced nodes wear studied. The main content in this paper is as followings:(1) Seven steel fiber reinforced concrete exterior joints were designed, damaged, filled up and strengthened by FRP. The impacts of strengthening way, fiber type and layers on strengthening effect wear studied. The results show the ultimate load and ductility of damaged reinforced concrete frame side node significantly increase by FRP strengthening method。(2) The finite element analysis separate method was used to establish the analytical model for the undamaged frame side nodes and the FRP reinforced frame side nodes to analyze the mechanical behavior of the frame side nodes. Comparison of simulation results with those of the experiment show that the analytical value is in agreement with the experimental well.(3) The all process behavior of the frame side nodes with or without the FRP strengthening under low-cycle reversed load was simulated by ANSYS software to get the skeleton curve, hysteretic curve, yield load, ultimate load, ductility and power ratio index. The behavior comparison was also done.
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