Strengthening of Continuous SCC Hollow Beams under Shear Stresses Using Warped CFRP Strips

Abstract

The present paper is deal with shear strength evaluation of continuous self-compacting concrete hollow beams containing internal concrete ribs and externally strengthening by carbon fiber strips (CFRP). Six full-scale beam specimens and series of control specimens were tested. The adopted variables in this study are the number of internal concrete ribs and external U-shape CFRP strips at (45º). Experimental results show that the shear failure was the dominant failure for all tested beams. The cracking and ultimate load are reduced by about (19.6-30.6%) for the hollow beams specimens contains five and three ribs respectively compared with the reference beam. The ultimate load was increased for about (50.7%) for five internal ribs hollow beams strengthened by CFRP strips in compared with the same beams but without strengthening.  While, the ultimate load was increased for about (33.46%), for beam specimen who has three internal ribs and strengthened by CFRP, in comparison with the same beams but without strengthening.

Keywords: CFRP Strips, Shear, Continuous Beam, Self-Compacting Concrete, Hollow, Ribs