A SEISMIC RETROFITTING METHOD FOR EXISTING REINFORCED-CONCRETE STRUCTURES USING CFRP

Carbon fiber with high strength, light weight, and high durability has been used for the seismic rehabilitation and strengthening of a numbe r of existing reinforced concrete structures. The authors have been in vestigating the seismic retrofitting methods using carbon fiber and th ose effects for improvement of earthquake resistance capacity since 19 84. We have developed three types of seismic retrofitting methods, nam ely for building columns, chimneys, and bridge columns. After the 1995 Great Hanshin-Awaji Earthquake Disaster, the amount of seismic retrof itting work using CFRP has significantly increased. This paper consist s of 7 sections: Section 2 introduces carbon fiber used and the produc t forms; Sections 3 through 6 describe the seismic retrofitting method s by CFRP; Section 3 is an overview of the methods; Section 4 describe s construction procedure of retrofitting; Section 5 gives an outline o f research and development; and Section 6 discusses utilization and co nstruction records.