Experimental Research And Numerical Simulations On H-Shaped Steel Beam Strengthened With CFRP

Fiber reinforced polymer (FRP) has been greatly used in engineering because of its low weight, high qualities in strength, anti-corrosion and construction. It is being used in civil and structural engineering in all kinds of shapes, and mainly for concrete strengthening. Researchers from home and abroad have made researches on steel structures strengthened with carbon fiber reinforced polymer (CFRP), but they just did some experimental researches and theories on steel beams or composite beams strengthened with CFRP. There is lack of systematic experimental and FEM analysis. The analysis of crack intensity model and interfacial crack mechanism in plasticity is still not enough.In this paper, we compared experiments of H-shaped beams strengthened with CFRP, and raised three models combined with Fracture Mechanics for simulation. We defined parameters of fracture mechanism comparing the results of simulation with experiment, and made parameter analysis using one of the three models. The whole work is as follows:1 We made conclusions of formal theoretical and experimental researches by referring to papers, made sure of the research targets and main contents; got knowledge of cohesion period and the formal cohesive models.2 We compared experiments of H-shaped beams bonded with CFRP in different loading conditions and different reinforced methods and gave out details such as ultimate bearing capacity and the specimens'mechanical properties by comparing test with analysis. Through the compared test results' analysis, we presented some useful conclusions in engineering applications.3 We compared formal FEM models, used cohesive surface, cohesive element and XFEM to simulate the interfacial combined with Fracture Mechanics, made sure of damage parameters by comparison with experimental results.4 We used cohesive surface in ABAQUS to do parameter analysis, compared the influence made by different beam depth-span ratio, length of CFRP and loading conditions to CFRP's effective length, interfacial normal and shear stress. We presented some useful conclusions of ultimate situation in plasticity.