Nonlinear Finite Element Numerical Simulation Analysis Research On I-shaped Steel Girder With CFRP

As a new and high-technique construction reinforcement method for reinforced steel structure, fiber-reinforced plastic (FRP) has many advantages such as high research value and popularizing value, it can bring huge social and economy benefit. The existing reinforced steel structures can be strengthened by adhering carbon fiber-reinforced plastic to the steel surface to improve their mechanical performances. The advantages of CFRP such as lightweight, non-corrosive, high tensile strength and easy construction make it widely used in strengthening field. The maturation of Finite Element Calculation Theory provides a computing tool to the reinforcement method. The finite element method (FEM) can simulate the Non-Linear Full-Range Analysis-the behavior of beams from linear to nonlinear responses and up to failure, it can save lots of human resource and material.Based on the summary of theory analysis and test research on steel structures strengthened with FRP both home and abroad, the key problems of steel structures repaired with FRP have discussed in details, such as bonding mechanism between FRP and steel beam, the selection methodology of repair materials, load transfer between steel beam and FRP. Then from the stain-stress relationship of steel materials, all element types needed in Non-liner Finite Element Analysis (NEFA) of steel structure and carbon cloth in ANSYS are studied.This paper put forward the expressions of the capacity in the composite member with CFRP and steel, which are be validated by the ANSYS methods. The"3D solid- truss-shell"finite element model has proposed in the paper, and the analysis and study of reinforced I-shaped steel girders strengthened with CFRP under the different types are done. The load-displacement curves, the ultimate loading of I-shaped steel girder and the deformation are presented and compared to the experimental results. Deviation reasons are analyzed data, which shows the modeling method is available and the outcome is reliable.At last, based on the"3D solid- truss-shell"finite element model, the analysis and study of single steel girder and reinforced steel girder strengthened with CFRP under the different gluing numbers and types are done. The influencing factors of repair effectiveness were discussed.