Experimental Research And Theoretic Analysis Of CFRP-reinforced H-beam Partially Encased Concrte Columns

Carbon fibers has been widely used as a new material of structural reinforcement for strengthening and maintenance existing concrete structures,due to their advantages in the high tensile strength and efficiency,good durability and corrosion resistance,light weight,easy construction etc.At present,domestic and international researches on CFRP reinforcement of concrete mainly base on reinforced concrete structures.In recent years,the application of steel reinforced concrete composite structure in high-rise or super high-rise buildings is increasing,also,steel reinforced concrete composite structure is facing a problem of repair and reinforcement after the steel corrosion,unreasonable structure design,fire,earthquake and other factors damage.Based on the above problems,CFRP-reinforced H-beam partially encased concrete column is proposed in this paper,and through experiment and theoretical analysis,the reinforcement effect of CFRP-reinforced PEC column is also studied systematically.This paper designs 12 H-beam partially encased concrete column including comparative column,and axial pressure,eccentric compression are studied through static loading tests.The contrastive analysis of reinforced components and unreinforced components has been given,including the influences of bearing capacity and deformability under different CFRP-reinforced layers and different eccentricity.The test results show that:after CFRP reinforcement,the bearing capacity of H-beam partially encased concrete column is raised to varying degrees,the biggest increase of 18.5%,increase the bearing capacity of axial compression columns than eccentric compression column is obvious,and it has more fully deformation development and better ductility performance when it is damaged.This article simulates the mechanical performance of CFRP-reinforced H-beam partially encased concrete column nonlinearly by using ANSYS finite element software,and through comparing with the simulation results of finite element analysis,both of the simulation and experimental results are in good agreement.Based on the experiments,this paper analyzes CFRP-reinforced H-beam partially encased concrete column theoretically,including the relationships among CFRP-reinforced layers,eccentricity and bearing capacity,and the damage models of concrete column are also included.Finally,this paper derives the formula of the ultimate bearing capacity of H-beam partially encased concrete column under the influences of axial pressure and eccentric compression.According to the calculation formula that derived in this paper,the results can effectively simulate the results of experiment.