Experimental And Theoretical Research On The Ultimate Bearing Capacities Of The Reinforced Concrete Beams Strengthened By CFRP Sheets

When the reinforced technique with bonded carbon fiber reinforced plastic materials is widely applied in the civil engineering, many scholars have investigated the ultimate bearing capacities of the reinforced concrete structure strengthened by CFRP sheets. The paper carried out an experiment upon ultimate bearing capacities of the seven pieces of reinforced concrete beams strengthened by CFRP sheets. On the base of the method of three-dimensional virtual laminated element brought forward by Professor Xu Xing, this paper proposes further the method of element block damage analysis and analyzes those experimental beams by my own programs. The comparison between the calculating and experimental results shows that they have a good agreement. In the paper, the load incremental method is adopted. By the way of reducing the elastic model of the destructive blocks in the elements, the finite element analysis model is revised and the repeated computing process doesn't finish until the results are converged. The proposed method can simulate the entire process of concrete structures from crack to complete damage. Because that the proposed method has so many merits such as the fewer elements, the higher computational efficiency, the higher computational precision, and good convergence, it should have extensive applied foreground in the ultimate bearing capacities' researches of the bridge strengthened by CFRP sheets and the other complex concrete structures. Those research findings can be consulted in the engineering practice and design of concrete structure strengthens.