The Study And Finite Element Analysis Of Reinforced Concrete Beam Strengthened With CFRP

Carbon Fiber Sheet was widely used in construction field because of its high intensity and simple structural performances. The particular excellent prevention of corrosion and incomparable technical advantage make the CFRP become the perfect material in strengthening harbor structure. So make clear the mechanism and give available design formulas are very important to consummate the technique rules of concrete structure strengthening by CFRP, and also important to the strengthening engineering in the future.At present, many universities and institutions have done the research of concrete beams strengthened by CFRP, and put forward their theory and designing method. But the methods are not perfect, the stress mechanism between CFRP,reinforcing steel bar and concrete is still not clear. This study is based on the experiments of concrete beams strengthened by CFRP, and studied deeply in reinforce effect and stress mechanism. This paper put forward a new viewpoint that the reinforcing steel bar transfers the increment of the stress to CFRP by the increment of the strain, so CFRP exerts its high intensity.This thesis also put forward a new method of calculating flexural capacity. The new method considers the influence of quadratic loading and length of rebar's yield point jog. The calculating formula entered intensity discount coefficientη, and the span of the coefficient was given in the paper. The calculating result was compared with the experimental result and they had a close agreement with each other.In this paper nonlinear finite element analysis by ANSYS software are done for concrete beams strengthened by CFRP, and the finite analysis result are compared with the experimental result. It shows that the finite element analysis method is feasible and available in the study of CFRP. This thesis provides reference for the research of CFRP in the future.