The Shear Performance Of Damage Concrete Beam Strengthened With NSM FRP Reinforcement

Since the 1980 s,FRP,known as a new material,is more and more been used in the reinforcement of engineering components,the most common way of FRP reinforcement is divided into two kinds: externally bonded and Near-surface Mounted(NSM).Externally bonded is the first to be kNown as a reinforcement research.NSM,compared to externally bonded,is easier to anchoring,corrosion resistance,the external load disturbance is small and can save more material.Therefore scholars both at home and abroad study on NSM reinforcement made a lot of testing.At present,the domestic research achievements of NSM reinforcement beam about flexural strengthened is more than shear strengthened,so this article mainly research the shear performance of reinforced concrete beam with FRP reinforcement of NSM.In this paper,13 reinforced concrete beams are designed by simulation and experiment(1 of the contrast beams,12 reinforced beams).Considering the effect of FRP reinforcement,FRP reinforcement angle and damage on the shear behavior of reinforced concrete beams,the simulation results of five concrete beams were verified by the experimental results.The results were in agreement.According to the previous FRP NSM beam research results,reference calculation formula of shear strength of stirrups,the formula for calculating the shear capacity of reinforced concrete beams strengthened with FRP stirrups under the condition of secondary stress is deduced and fitted.In this paper,ABAQUS finite element analysis software was used to model FRP reinforced concrete beams.And the loading analysis of each specimen was carried out.The results show that: with the increase of FRP reinforcement,the shear capacity of reinforced concrete beams is obviously improved;FRP embedding angle is 45°higher than 90° in shear bearing capacity;in the FRP reinforcement reinforced concrete beams,the larger the damage value,the smaller the final ultimate bearing capacity.Although the gap is not large,but for the design of high precision design,the impact of the initial load is not negligible.In this paper,the calculation results of the calculation formula of the shear capacity of FRP NSM reinforced concrete beams are in good agreement with the simulation results,which can be used by the researchers.