Finite Element Analysis Of Reinforced Concrete Columns Under Eccentric Loading Strengthened With Carbon Fiber Sheets

Carbon Fiber Reinforced Polymer(CFRP)has the advantages of high strength,high efficiency,light weight,corrosion resistance,high temperature resistance and fatigue resistance,Which are widely applied to the rexinforcement of structure engineering industry.At present,domestic and foreign sholars have done a lot of research on axial compressive behavior of concrete columns reinforced with carbon fiber reinforced composites.However,The mechanical properties of CFRP-reinforced concrete columns under eccentric Loading are less studied.Impractical engineering,the concrete columns are mostly in the eccentric stress stat.Most of the columns are subjected to eccentric loading,and the section of the component is subjected to the combined effects of bending moment and axial pressure.Therefore,the research of CFRP reinforced Concrete Columns under Eccentric Loading has more engineering application value.Stduy on the failure process and failure mode of 21 reinforced concrete columns under eccentric loading.The effects of different bonding methods of carbon fiber cloth on the bearing capacity and deformation performance of large and small eccentric specimens were discussed.The research parameters analyzed the influence of factors such as belt spacing,strip width,number of layers,reinforcement in the column,and longitudinal fiber cloth combined with transverse strip fiber cloth on the reinforcement effect.The load-column deflection curve,ultimate bearing capacity,crack distribution map,concrete stress cloud diagram,carbon fiber cloth stress cloud diagram and carbon fiber cloth load-strain curve of different reinforcement scheme specimens were analyzed.The results show that the horizontally bonded carbon fiber cloth greatly improves the bearing capacity and ductility of the small eccentric test piece,and the bearing capacity of the large eccentric test piece is not improved obviously.The strengthened and strengthened test piece of the carbon fiber cloth strip in the column is more uniform than the CFRP strip.The belt width test piece has better restraining effect on the concrete in the core area,and the bearing capacity and ductility are further improved.The longitudinally bonded CFRP improves the bearing capacity of the large eccentric test piece obviously,but it will lead to brittleness when the test piece is broken;The large eccentric specimens with the longitudinally bonded CFRP and transversely bonded CFRP strips have the best reinforcement effect,the ductility of the specimens and the ductility are improved.