Finite Element Analyses On Bending Capacity Of Reinforced Concrete Beam Strengthened With FRP

As time goes on, problems such as aging, cracks of concrete structures will appear which could be dangerous for us to continuously use it. For postponing structures'life span and cutting down the cost and time of reconstruction, it must be reinforced. FRP is one of the most popular and widely used materials in this industry during recent years which includes CFRP, GFRP and AFRP. However, researches are mainly focused on CFRP, GFRP and little attention be paid to AFRP. This paper mainly discusses AFRP in order to find out flexural performance of concrete beam after it be reinforced with AFRP. Comparing with CFRP and GFRP, AFRP has higher strength and modulus elasticity. Besides, it also has excellent merits of higher temperature endurable, acid-alkali resistance and light-weight and so on.Based on many prior researchers'studies and according to the experiment of (?), this paper employs Finite element method to study 12 beams which modeled by ANSYS and analyzes the influence of all kinds of parameters (such as the degree of pre-loaded, fiber paste layers, fiber types etc.) when they are charging on strength of reinforcement beams. Results show that: Firstly, the cracking load, yield load, ultimate load of concrete beam increased at various degree and its development of deflection was limited after it been reinforced with AFRP. Secondly, with the usage of AFRP increasing, ultimate moment bearing capacity, cross-sectional stiffness of strength-beam increased and its deflection under load decreased. However, these changes are nonlinear which assured there is maximal value of usage. Thirdly, it must be economic and rational on the prerequisite satisfying ultimate bearing capacity. Fourthly, in the same situation, the greater degree of pre-load, the smaller degree of advancement beam carrying capacity, the greater post-strain produced by AFRP while it has little influence on deformation characteristic of beam, because the lagged response plays a decisive role in the reinforcement concrete beams strength result under the second loading. Fifthly, the extent of strength-increased is inversely related to reinforcement rate. Finally, owning to its high compressive strength concrete, reinforcement and fiber can perform a better bending bearing capacity after high-strength concrete beam been reinforced and the strength effect will be better than lower-strength concrete beam.Additionally, modeling results and experiment values were compared in this paper and they were closed which demonstrates that Finite Element Method can be used to research the bending and shear resisting and the Finite Element software can model the process of bending and the relationship between strain and stress of beam and it is feasible to analyze FRP reinforced reinforcement-concrete structures with Finite Element software. It can be seen that Finite Element Method will be more widely used in strength industry.