| Fiber reinforced polymers(FRP), have been widely used in strengthening concrete structures, with the increasing demand for reinforcement members in the field of civil engineering. It has become an important way of strengthening to its excellent corrosion resistance, high strength, ease of construction, non-increase cross-sectional area. Shear strengthening RC beams is one of the most important applications in this strengthening technology. For shear strengthening RC beam studies, some scholars have studied aspects of the test. However shear experiment date Into the system remain Inadequate, due to the complexity of concrete beam shear properties,restrictions test conditions, experimental design limitations and so on, and influencing factors study remain the level of single factor analysis. While the influence factors interact each other and cooperate with each other. What’s more, shear performance is not a simple combination of Single factor influence law. It is possible to research the shear performance by finite element method(FEM), with the development of FEM theory and computer technology. The FEM is the mean which saves time and funds and test conditions limitations is not a problem for, and it can be Effective analysis means for influencing factors. In this paper, the purpose is that a finite element model is suitable for RC beams shear-strengthened with FRP, on the basis of the concrete plasticity damage model.In this paper, six concrete plasticity damage models are selected to orthogonal analysis between tension damage factor and compression damage factor, then horizontal analysis and longitudinal analysis are analyzed separately. It can be concluded tension damage factor is an important influence factor for the shear performance, while compression damage factor is a Limited influence factor for the shear performance and the influence reflected in the declining segment. What’s more, the concrete plasticity damage model which is suitable for FRP reinforced concrete beam shear simulation is selected by orthogonal analysis.In this paper, the FE model of the Concrete beams without stirrups, Reinforced concrete beams, and RC beam shear-strengthened with FRP are built, and the three type models to form a whole, which makes the analysis step by step and Three models are compared with each other. The regular pattern of each type model and time history analysis is given.In this paper, dilation angle and viscosity parameter which are greater impact on the shear simulation are conducted to a parametric analysis, which influence law is worked out and the factors that affect the expansion angle defined are the Summarized. Element size and interfacial bond-slip parametric analysis are conducted to parametric analysis too. The influence law of element size, the importance of the interfacial bond-slip model definition and the analysis of the interaction between Stirrups and FRP strips are given in this paper.In this paper, the beam model shear span ratio distributed in about 3, which belong to a large shear span ratio concrete beam which there are the perfect test data and significant shear failure mode. While the beam failure mode of smaller shear span ratio is different from the larger ones, so modelling shear failure of FRP-strengthened RC beams with shear compression failure is beyond the scope of the present study.
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