Article,
Towards Modeling of Reinforced Concrete Members with Externally Bonded Fiber-Reinforced Polymer Composites
ACI Structural Journal, 100 (1): 47--55 (January 2003)
Abstract
Fiber-reinforced polymer (FRP) composites have been increasingly studied
for their application in the flexural or shear strengthening of reinforced
concrete (RC) members. Although substantial increases in strength
have been achieved, reductions in ductility have also been reported
as a result of debonding failures near the concrete-FRP interface.
The debonding phenomenon is the subject of the experimental program
described herein, which involved the strengthening of shear-critical
beams using carbon FRP (CFRP) strips. It has been determined that
the bond-slip behavior at the bond interface must be considered in
the numerical modeling of externally reinforced members. Essential
to analyses using a finite element program are the formulations of
bond elements and their constitutive relations. The implementation
of link and contact elements, along with linear elastic and elastic-plastic
bond laws, is shown to produce accurate predictions of member response.
