Finite Element Method Of Beam Of Composite Rehabilitation With Bonded Carbon Fiber Reinforced Polymer And Steel Plate

The need for strengthening and retrofitting existing structures or damaged ones is one of the most important problems that structural engineering faces. Nowadays, fiber-wrapping and steel-bonding have been the most popular ways to reinforce RC structures, both of which have their own advantages and disadvantages. The combination rehabilitation method which this paper puts forward is a more efficient method than single material reinforcement.To develop a more thorough understanding of the bending behavior of reinforced concrete beams, the study on nonlinear finite element analysis is very imperial. Based on the experiments of the bending behavior of RC simply supported beams strengthened by bonded CFRP and steel plate, nonlinear finite element analysis is presented on the basic mechanics performances of RC T-beams strengthened with bonded CFRP and steel plate in the ANSYS software environment, and analyses factors that affected limit load for RC beam of composite rehabilitation. Mechanical characteristics of composite rehabilitation are analyzed and summarized according to previous experimental data. The effects of the reinforced carbon fiber layers and steel plate thickness on the bending behavior of a reinforced concrete beam are found by choosing appropriate model element and solving program. Meanwhile, failure mechanism of reinforced concrete beam strengthened by CFRP and steel plate and main factors which affects strengthening effects are analyzed as well.First, the paper sets up finite element models of RC beams strengthened by bonded CFRP and steel plate. Not only material nonlinear of concrete and steel bar but also bond styles of longitudinal steel and CFRP and steel plate are taken into account. In this paper, spread-finite element model is adopted. Different element types are used in the model. Longitudinal steel is modeled by using 2-node truss element. Concrete is modeled by using 8-node three-dimensional solid element with the performance of crack and crush. CFRP and steel plate are modeled by using three-dimensional element. At the same time, it is assumed that the bonding between steel bar, CFRP, steel plate and concrete is in good condition. Under line load, using finite element method, deflection of beams at the center of span, and load-stress, load-strain of steel bar and CFRP sheet are analyzed for RC simply supported beams strengthened by different types of CFRP. If the basic assumptions are satisfied, the results show good credibility, which indicates that they are in a good agreement compared with those of the results obtained from the test. Then, the influences of the layers of CFRP, thickness of steel plate, compressive strength of concrete on the reinforcing effect are analyzed.