The Performance Test And Numerical Simulation Of Mixed Concrete Reinforcement Beams

Concrete is the most amount of civil engineering materials and reinforced concrete structure has become the world’s most widely used structure. But due to various reasons, there will be able to meet the conditions of its durability design requirements, steel corrosion is the main reason for the destruction of reinforced concrete structures. With GFRP bars in place of all or part of reinforced with concrete is a fundamental method to solve the problem. Therefore, the study carried out by the mechanical behavior of GFRP reinforced concrete beams has very important significance.On the basis of the literature review, the mechanical properties of tendons and bonding properties of GFRP bars and concrete are firstly to be experimental studied and analyze the influence of various factors on them.Combined with the test results,the paper present the constitutive modles of GFRP bars and the slip of GFRP bars and concrete. Acorrding to the experimental study on flexural,the paper analyies the contents of the whole process of its force, ultimate bearing capacity, the load-deflection curve and crack development and verifies the feasibility of GFRP bars instead of steel and flat section assumption. The low modulus of elasticity of GFRP bars limites.The paper designs a high-modulus composite reinforcement in main with GFRP bars to let the elastic modulus of the reinforcement from the original 40GPa maximum lift to 60GPa, and further enhance to 90GPa by improving technology. Using finite element analysis software ABAQUS, by selecting appropriate unit model, material constitutive relations and failure criteria, the paper simulate the GFRP reinforced concrete beams and GFRP bars mixing with steel reinforcement beams. The results are consistent with the experimental results and verify the applicability of the model. Then chose the model to simulate composite reinforcement beams and analy the characteristics of its flexural damage and destruction stages. Finally, the paper combines norms and research results, choses the method of theoretical analysis to discuss the damage and destruction stages of GFRP reinforced concrete beams, GFRP bars mixing with steel reinforcement beams and composite reinforcement beams. Then the paper propose the formulas of normal section bearing capacity and cracks. The formulas are validated through the test results and finite element simulation results. These work has laid a foundation to in-depth study of GFRP reinforced concrete structures mechanical behavior.