Research On Shear Capacity Of Reinforced Concrete Beam Strengthened With Bolted Side Steel Plate

In the anchor bolt steel plate strengthening method,the cooperative force of group anchor effectively avoids the peeling phenomenon between steel plate and concrete,effectively improves the shear bearing capacity,rigidity and ductility of the reinforced components,and the anchor bolt steel plate strengthening method has low cost,simple construction,and can maximize the material characteristics of steel plate and anchor bolt.At present,the research on the reinforcement method of anchor bolt steel plate mainly focuses on the bending resistance of the normal section,but less on the shear resistance of the inclined section,and there is no complete theory and calculation formula.However,there are a lot of engineering examples that need the shear reinforcement of the inclined section in the actual project.On the basis of the experimental research results,this paper uses the finite element theory and the truss arch model theory to further study the shear resistance,mechanical properties and stress mechanism of the inclined section of RC Beams Strengthened with anchor bolt steel plates.The specific work is as follows:(1)The reliability of the finite element model in this paper is verified according to the previous experimental research of the research group and the verification of the experimental finite element model in the existing literature.Through the finite element calculation and analysis,the influences of the number of anchor bolt rows,the diameter and spacing of anchor bolt,the thickness and height of steel plate,the strength grade of concrete,the shear span ratio of components,the bond slip and other factors on the shear performance,mechanical properties and stress mechanism of the inclined section of RC beam strengthened by anchor bolt steel plate are discussed and analyzed;(2)Based on the sensitivity analysis theory,the shear behavior of RC beams strengthened by steel plates with anchor bolts under 8 influencing factors is calculated and discussed;(3)Based on the finite element analysis of shear resistance of RC Beams Strengthened with anchor bolt steel plates,combined with the theory of truss arch model and the balance condition of force,the semi empirical and semi calculation formula of shear capacity of RC Beams Strengthened with anchor bolt steel plates is derived,and the rationality of the formula is proved by comparing with the results of existing literature;(4)This paper compares the formulas derived in this paper with those in Chinese and American codes,and discusses the applicability of the formulas in calculating the shear capacity of RC Beams Strengthened with anchor bolt and steel plate.