Abstract
In this research, a retrofit method using combination of carbon fiber reinforced polymer sheet (CFRP sheet) and steel jacketing was studied for upgrading seismic performance of reinforced concrete (RC) bridge columns that termination sections of the longitudinal reinforcements were already retrofitted with CFRP sheet jacketing in the first stage of the seismic retrofit strategy. This method takes advantage of both steel plate and FRP sheet, in which steel jacketing is adopted forstrengthening theflexuralcapacityofthecolumn basewhereplasticdeformationisexpected tooccur during the large earthquakes and CFRP sheet jacketing is adopted for strengthening the other sections of the column. CFRP sheet is connected to the steel plate by means of bonding with epoxy resin. Double-lap shear bond tests, cyclic loading tests on RCcolumn specimen and three-dimensional FEM analyses were conducted forestablishing design method. As the results of discussions, design method of the connection between CFRP sheet and steel plate was proposed and the e ff ectiveness of the proposed retrofit method was confirmed.
