Study On Method Of Seismic Reinforced Frame Joint With High Performance Composite Mortar Reinforced By CFRP Net

The RC frame joint is characterized by its criticality,complexity,and weakness,while in the seismic fortification,there are strict requirements for the “strong column,weak beam,and stronger joint core area”.As a reinforcing material used to reinforce the joints,CFRP nets is more lightweight,high-strength,high-modulus,soft and easy to construct,durable,corrosion-resistant,fatigue-resistant,anti-magnetic,anti-shielding,anti-peeling,and reduced reinforcement layer thickness compared with reinforced mesh.This method of integrating the CFRP mesh into the joints of the high-performance cement composite mortar anti-seismic reinforcement frame will have more comprehensive advantages,and systematic research on the CFRP mesh will have important engineering practical significance and theoretical research value.In this paper,the combination of experimental actual observation,numerical simulation and theoretical analysis of the nodal model is used to study the seismic performance of the reinforced joints,and a corresponding calculation theory is established.The practical and reliable calculation formula for the bearing capacity and the reinforcing construction technology and construction measures are proposed to achieve the purpose of supplementing and improving the existing research results.The main research conclusions obtained through experiments,finite element simulations and theoretical derivation are as follows:1.The bearing capacity,crack resistance,stiffness and ductility of the reinforced specimens are significantly improved.The failure morphology of the specimens after the reinforcement changes from the shear failure in the core of the node to the bending failure of the beam end near the core area,which significantly improves the failure modes of the frame joints.the reinforcement method for high-performance composite mortar reinforced by CFRP nets can effectively improve the seismic performance of frame joints.2.Through comparison tests of the three methods of reinforcement,it was found that the effect of the third combined reinforcement method is the best,and the process is simple and the construction quality is easy to guarantee.3.The analysis results of ANSYS finite element software are basically consistent with the experimental measurement results.The two are mutually verified;the rationality of the finite element simulation is verified,which can provide reference and reference for actual engineering reinforcement design and analysis.4.Based on the theory,the theoretical calculation formula for the various bearing capacity in the core area of the frame joints of the reinforced high-performance composite mortar reinforced with CFRP nets are deduced.The data calculated by the theoretical calculation formula is in good agreement with the experimental measured data and the finite element software simulation data,which proves the reliability of the derived theoretical calculation formula.Therefore,this set of theoretical calculation formula has a good reference value for the actual reinforcement of the project.