Seismic Research Of Concrete Column Strengthened With NSM FRP Reinforcement

Concrete construction technology with FPR reinforcement has become a kind of popular technology in recent years.This kind of technology has been widely used in building reinforcement and old building renovation.Carbon fiber and other fiber materials are used in FPR reinforcement technology.The combination of the above materials can strengthen structural element and improve the effect.The common way of FRP strengthening methods are external plate reinforcement at home.Externally bonded reinforcement is often used in column reinforcement.Compared with traditional strengthening method,FPR strengthening method has more advantages than traditional method such as: a)FRP materials and the original structure have good adhesion features.b)It weak fire disaster to FRP materials.c)It can be used for hogging moment reinforcement effectively.d)We can take full advantage of the reinforcement of FRP material.It can also improve the ultimate bearing capacity of structural element effectively.Common reinforcement methods were often used in beam and slab structures.The method of using NSM in RC columns is not recognized widely at home.Common methods of reinforcement columns are outsourcing angles and external constraints,fiber materials,etc.Embedded reinforcement columns have become common methods of reinforcement.In this paper,basing on Barros' research,we introduced NSM reinforcement technique with cross section damage in reinforcement of RC column.This article mainly studies the reliability index effect of reinforced columns' bearing capacity and ductility when CFRP materials are used in reinforced columns through the method of finite element simulation.This article includes three chapters except the introduction and conclusion.The process of embedded reinforced RC column is introduced in the second chapter.It includes test set,material selection,loading device and test data.It also explains the conclusion of the experiment briefly.On the one hand,it proved that it is feasible to reinforce the RC column using the embedded reinforcement method.On the other hand,it put forward the premise for further study.In the third chapter,it expounds the simulation results of the experimental group using ABAQUS finite element simulation,the bending force of RC column based on the experimental process simulation,tensile strength of CFRP slab,long column slab layout along the horizontal direction,and the effect of horizontal force and axial pressure on simulated load.The main control variables are the spacing of the embedded slab,the axial compression ratio and different reinforcement methods(NSM reinforcement,external reinforcement and composite reinforcement method).The comparison between the experimental data and the simulation data shows that it is feasible to use the embedded reinforcement method for the RC columns.The improvement of the bearing capacity and ductility of the embedded reinforcement are studied with the axial compression ratio and the spacing of the strengthened slab.The ultimate shear strength and the improvement of seismic resistance of RC columns are more obvious.The formula for the improvement of the bearing capacity of the column is the basement of the embedded reinforcement.The article compares the experimental data and simulation data which referred in theprevious chapters of the fourth chapter.We gained the formula for the improvement of the bearing capacity of the column according to the curve fitting.In this paper,the ABAQUS software is used to simulate the performance of CFRP embedded reinforced column.This article researches the simulation study of mechanical performance of CFRP embedded reinforced column based on the platform of ABAQUS software.It aims at the comparison and analysis of entire stress process of each column.The stress and deformation of CFRP that embedded in reinforced concrete structure can be simulated effectively when reasonable unit type and constitutive relation are adopted.The hysteresis curve of the column is given through simulation.This article also studies the finite element calculation and bearing capacity.The simulation result is consistent with the experimental data.