STRENGTHENING OF REINFORCED CONCRETE BEAMS WITH CARBON FIBER REINFORCED POLYMERS

Document Type : Original Article

Authors

Civil Engineering Department, College of Engineering and Islamic Architecture Umm Al-Qura University, P.O. Box 6298, Makkah, Saudi Arabia

Abstract

Strengthening of structures is a complex task. Different systems can be used in order to utilize the
fiber reinforced polymer in the most efficient way. Two techniques for surface reinforcement in
reinforced concrete beams are addressed in this paper, namely, extemally bonded laminates (EBL)
and near surface mounted strips (NSM). The experimental work involves seven !XI-scale
reinforced concrete beams strengthened with carbon fiber reinforced polymers (CFRF') and tested
up to failure to illustrate two methods of field application and construction techniques of
strengthening. The performance and effectiveness of these techniques are demonstrated by
comparing the test results of both strengthened and un-strengthened beams. Test results indicate
that both techniques are effective in increasing the flexural capacity of R.C. beams. Also it was
observed that the beams strengthened with NSM reinforcements show different failure modes than
the externally bonded FRP. Applications of the two methods of strengthening R.C beams are
suitable for all cases, but prior to the installation of surface bonded CFRP reinforcement, attention
should be directed toward investigating the surface concrete on which the composites are to be
bonded.

Keywords

ERJ. Engineering Research Journal
Volume 32, Issue 2
April 2009
Pages 223-231

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