The Finite Element Analysis Research On Steel Structures With CFRP

The research field of structures strengthening is very important in civil engineering. Structures strengthening with fiber reinforced polymers(FRP) is a new strengthening technique, which is a research issue in the strengthening field. Currently FRP is used extensively in the concrete structure strengthening and retrofit. The design methods and the working techniques of the concrete structure strengthening using the CFRP are all perfect increasingly. But there is little information of the research and application using CFRP in the steel structure all over the world. According to the finite element method, this paper researches on the technology of strengthening and repairing vice-steel with CFRP.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, surface preparation of FRP and steel beam, load transfer between steel beam and FRP.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-spring-shell" finite element model has proposed in the paper, and the key techniques have discussed when the general purpose software ANSYS has adopted to the bending steel beam members strengthened with FRP. The influencing factors of repair effectiveness have discussed.The conclusions and suggestions in the paper will play very important reference values for the development of metallic structures rehabilitation.