Experimental Study On The Mechanical Behavior Of Eccentric Loaded Circular Steel Columns Strengthened With CFRP

Carbon fiber reinforced polymer(CFRP)has many advantages,such as light weight,high strength,convenient construction and so on.These characteristics make it an advantage in the application of steel structure reinforcement,and in recent years,many scholars have done a lot of research.Although scholars at home and abroad have done some research on the bearing capacity of steel columns strengthened with CFRP under axial compression,few studies have been done on the situation of eccentric compression.In view of the existing problems,it is necessary to study the mechanical behavior of eccentrically loaded steel columns.The experimental study on CFRP reinforced eccentric compression steel columns was carried out by setting up 8 reduced scale steel tube specimens(including 2 specimens of non-reinforced circular steel tubes,and 6 specimens of the CFRP strengthened steel tubes).The effects of different eccentricity and different layers on the bearing capacity and stiffness of the eccentric compression circular steel tubular columns strengthened by CFRP are studied.This paper proposed the stability capacity calculation formula using the equivalent section method proposed by British Construction Industry Research and Information Association(CIRIA)in <Strengthening metallic structures using externally bonded fibre-reinforced polymers>.Then it conducted the calculation formula of in-plane stability of eccentrically compressed circular steel tube column after CFRP reinforcement.At the same time,the calculation model is established by ANSYS,and the finite element simulation of eccentric compression test is carried out.Finally,by comparing the experimental value,the theoretical calculation value and the simulation results,the calculation formula of the in-plane stability of eccentrically loaded circular steel tube column after the modified CFRP is given.This subject is supported by national standard “Design code for strengthening steel structure” and the research findings of this paper will provide theoretical and experimental bases for writing this standard.