Research On The Connecting Method And Mechanical Behavior Of Flexural Component’s By The Method Of Enlarging Sections

The improvement of existing buildings due to the structure of the functional requirement,the emergence of the problem such as low reliability, durability and need reinforcementrenovation. At present, the reinforced concrete structure in enlarging section method is amethod in common use, strengthening flexural member of enlarging section method,combining with the new and old concrete surface is a weak bearing surface and combiningwith the working performance will directly affect the deformation and stress distribution ofreinforcement component performance. Therefore, enlarging section flexural memberreinforced increase and improve the new and old concrete and the connection method andmechanical performance, theory and technology of existing buildings reinforcement andreconstruction and the engineering application has important research significance.This paper through the analysis of enlarging section method to reinforce the performanceof flexural member, and combined with the new and old concrete bonding mechanism, putsforward the new and old concrete surface by using artificial cut wool processing and addingstructural steel connection methods. Consider different ways of planting bar decorate, totaldesign made two sets of four flexural member, and the monotonous static load test and finiteelement numerical simulation analysis, four research conclusion:(1) Enlarging sectionmethod to reinforce flexural member, should be carried out in combination with surfaceartificial planting bar cut hair and add structure processing, enlarging section flexural memberreinforced form transformation of joint surface connection method；(2) Planting bar structurecan significantly increase the new and old concrete and the bond performance and jointsurface cracking performance, greatly improving the ability to work together old and newconcrete, combining with no cracks appear below;(3) Improve the method of combining theconnection, adopt planting bar decorate construction, reinforced specimen stress performanceclose to the one-time concrete specimens；（4）Planting bar according to the failurecharacteristics of the specimens, adding structure and inserted in the old concrete beam hole depth of15d, and the research and analysis of test data, and put forward enlarging sectionmethod for inclined section flexural member reinforced shear bearing capacity calculationformula and calculation formula of normal section flexural capacity.The above research results for further study on enlarging section method to reinforcethe forced properties of flexural member, and new and old concrete interface connectionmethods, perfecting the design code of concrete reinforcement and reconstruction has certainreference value, It also can supply consult for the design and construction of thereinforcement and modification engineering.