The Study On Cross-section Flexural Properties Of GFRP Reinforced Concrete Beams

Reinforced concrete structures have a wide range of applications in civil engineering at home and abroad, with a mature design theory and construction technology. However, because of easily corroded of steel bars, the overall durability of the structure is affected. Especially in the marine environment or the use of de-icing salt environment,the corrosion of steel is particularly serious. GFRP materials in view of high-strength, corrosion-resistant characteristics, this paper studied the GFRP reinforced concrete structure.It respectively use GFRP bars, GFRP bars - steel, GFRP bar-laminate as the pull material.GFRP bars,steel and GFRP laminates combined.It make a reasonable structure of GFRP reinforced concrete.In this paper, through experiments and theoretical analysis, it researchs GFRP reinforced concrete beams, GFRP bars– steel reinforced composite beams, GFRP bar - laminate composite beams. based on reinforced concrete beams,through comparative analysis of the experiment, it obtained the law of load-deflection,cracks development and damage format of GFRP reinforced concrete beams, GFRP bars -steel reinforced composite beams, GFRP bar– laminate composite beams mixed with different proportions and forms. On the basis of this, it made a further analysis of GFRP reinforced composite concrete beams with reasonable composite form and in accordance with the relevant theory get the cross-section formula for calculating the flexural capacity of GFRP composite reinforced concrete beams, the cracks calculation and limits, stiffness and deformation calculation and limits. with the rational model and the reasonable simplification of materials, it do finite element analysis . IT test results with the comparative analys of the experiments to verify the finite element model' reasonableness and accuracy. on the basis of different reinforcement ratio of GFRP reinforced concrete beams to do further analysis of the feasibility of GFRP substitute steel。in this paper, the studys and the conclusions will promote the application of GFRP in concrete structureand improve the durability of concrete. It has a theoretical and a reference value.