Shear Performance of RC Members Strengthened with Externally Bonded
FRP Wraps
Proceedings of the 12th World Conference on Earthquake Engineering, page 10. Auckland, New Zealand, Upper Hutt, New Zealand, (January 2000)paper 305.Abstract
This study presents the shear performance and the modes of failure
of reinforced concrete (RC) beams
strengthened with externally bonded carbon fiber reinforced polymer
(CFRP) wraps. The
experimental program consisted of testing twenty-seven, full-scale,
RC beams. The variables
investigated in this research study included steel stirrups (i.e.,
beams with and without steel stirrups),
shear span-to depth ratio (i.e., a/d ratio 3 versus 4), CFRP amount
and distribution (i.e., continuous
wrap versus strips), bonded surface (i.e., lateral sides versus U-wrap),
fiber orientation (i.e., 900/00
fiber combination versus 900 direction), and end anchor (i.e., U-wrap
with and without end anchor).
As part of the research program, the experimental study examined the
effectiveness of CFRP
reinforcement in enhancing the shear capacity of RC beams in negative
and positive moment regions,
and for beams with rectangular and T-cross section. The experimental
results indicated that the
contribution of externally bonded CFRP to the shear capacity is significant
and dependent upon the
variable investigated.