Research Report FHWA Contract DTFH61-03-C-00104 Research Task No. 7 Retrofit of Rectangular Bridge Columns RETROFIT OF RECTANGULAR BRIDGE COLUMNS USING CFRP WRAPPING by Mesay A. Endeshaw, Mohamed ElGawady, Ronald L. Sack and David I. McLean Washington State Transportation Center (TRAC) Washington State University Department of Civil & Environmental Engineering Pullman, WA 99164-2910 Prepared for The Federal Highway Administration U.S. Department of Transportation Hamid Ghasemi, Project Technical Manager December 2008