The Research Of External CFRP Sheet Shear Strengthening R.C Space Frame Node

Reinforced concrete(RC) frame structure is one of the most widely used structure in the buildings, especially in our country.In the RC frame structure, the beam-column joint plays the role of connecting beam and column, transferring and distributing internal forces, coordinating the deformation of structural members and ensuring the integrity of the structureSo it is very important to study the method of seismic strengthening of joints.Carbon fiber reinforced composites(CFRP) is a new composite materials with good mechanical properties, including light weight, high tensile strength, corrosion resistance, anti fatigue, easy construction and fast construction speed, so CFRP applied to RC frame structure more and more widely. So far, method study on RC structures strengthened with composite materials is confined in the component, while the frame joint reinforcement is relatively few. Because of the large difficulty of frame joint reinforcement, the theoretical research and practical application of composite materials reinforced node are extremely dishamonious, so that the study is relatively slow.In this paper, the method of CFRP strengthening the space frameis studied, espicially the seismic performance of the space frame joints strengthened by CFRP.The finite element software was used to simulate and test analysis, and the mechanical mechanism of the joints with different reinforce methods was compared.In this paper, the finite element analysis software ANSYS is used to build three enhanced composite reinforcement framework for the middle side node model and one finite element models with non-reinforcing frames for contrast.In the simulation analysis, by applying the load on the beam end, the damage mechanism of the finite element model under different reinforce ways is studied.Through the finite element simulation analysis, it is concluded that the shear capacity of the reinforced composite reinforced with CFRP is significantly improved, and the deformation capacity of the core area inside the joint is improved obviously.