Ductility Performance Of RC Beams
Strengthened With CFRP Sheets
Author(s)
F. Ceroni & M. Pecce
Abstract
An experimental program about (RC) beams externally strengthened with carbon
FRP sheets is presented in order to discuss strength and ductility performances.
The influence of the failure mode due to delamination is evidenced. The
evaluation of ductility and plastic rotation is developed. Cyclic behaviour with a
low number of cycles also in the post elastic range is examined.
Keywords: RC beams externally bonded reinforced, carbon fibres, cyclic loads,
bond, delamination, anchorage, ductility.
1 Introduction
The strengthening of existing RC flexural members by external FRP laminates is
one of the most widely adopted solution for supplying additional external tensile
reinforcement. Applications regard shear and flexural reinforcement,
confinement of column and joints (Toutanji et al. [2], Antonopoulos and
Triantafillou [1]), therefore are now available national and international code
indications for the design of elements externally bonded with FRP (ACI
Committee 440.2R [3], fib Bulletin 14 [4], Isis Canada [5], Japan Society of Civil
Engineers [6], CNR DT200-2004 [7]). However there is still a lack of
information and indications about performances of strengthened members in
terms of ductility and strength behavior for cyclic load histories, that are both
topic aspects for seismic retrofit.
About ductility it has to be underlined that FRPs are brittle materials because
fibers have a linear elastic behavior until failure. Therefore for elements
externally strengthened with FRP laminates, at ultimate condition, in addition to
concrete crushing or steel reinforcement rupture, crisis of external reinforcement
could happen for FRP debonding. Concrete or steel failure occurs with more o
Keywords
RC beams externally bonded reinforced, carbon fibres, cyclic loads,
bond, delamination, anchorage, ductility.
Related Book
Other papers in this volume
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