Strengthening and repair of double curvature reinforced concrete columns by means of carbon fiber stripes used as longitutional and confinement reinforcement

In this study, strengthening and retrofitting of double curvature reinforcedconcrete columns with fiber mat jacketing was studied. Carbon fiber reinforcedpolimer (CFRP), which a type of advanced composite material, used for thestrengthening of reinforced concrete columns by the jacketing method.In thisstudy, one as a referance member, totaly three specimens, were tested.And fiveexperiments have done. The first experiment in the experimental programmewas the bare specimen RM. In the second experiment, CFRP has jacketed to thecolumn as two large and eighteen small parts. The carbon mat was cut throughmid-axis and jacketed to the element to increas strength of SSFS experimentelement.In the second part, the carbon mat was cut through mid-axis andjacketed to the element from the bottom side. After that the small CFRP partsare used to wrap the column with 5 cm-spaced as stirr-up.In the thirdexperiment, SCFS strengthening was performed.CFRP has jacketed to thecolumn as two large and eighteen small parts. The carbon mat was cut throughmid-axis and jacketed to the element to increase the strength of SCFSexperiment element from left-side of the column.After covering, left side ofCFRP has pasted to top, right side of CFRP has pasted the bottom of thecolumn. The carbon mat was cut through mid-axis and jacketed to the elementto increase strength of SCFS experiment element from right side of the columnafter covering, the right side of CFRP is pasted the top of the column. After thatthe small CFRP parts are used to wrap the column with 5 cm-spaced as stirr-up.Carbon-fiber was removed from the conducted specimens after these twostrenghthening experiments.Crushed concrete parts have taken from thespecimen and repaired to have the original change.After that, these specimensretrofitted by the same technique explained above.After retrofitting,RSFS,RCFS experiments were made.Totaly five experiments have carriedout.Finally 5 experiments have canducted rand the maximum load capacits,energy consumption, rigidity, ductilidy, of behavior and strength the elementwere investigated.Science Code : 911.1.144Key Words : Repairing, Strengthening, fiberPage Number : 82Thesis Advisor : Yrd.Doç.Dr. Yusuf Demirel