models for the FRP-concrete interface are proposed based on meso-scale
are better than any other existing design or analysis models.
G. Teng of the Hong Kong Polytechnic University. Prof. L.
P. Ye and J. J. Jiang of Tsinghua University.
models for FRP sheets/plates externally bonded to concrete.
Structures. 2005. 27(6). 920-937
ABSTRACT: An accurate local bond-slip model
is of fundamental importance in the modelling of FRP-strengthened
RC structures. In this paper, a review of existing bond strength
models and bond-slip models is first presented. These models are
then assessed using the results of 253 pull tests on simple FRP-to-concrete
bonded joints, leading to the conclusion that a more accurate
model is required. In the second half of the paper, a set of three
new bond-slip models of different levels of sophistication are
proposed. A unique feature of the present work is that the new
bond-slip models are not based on axial strain measurements on
the FRP plate; instead, they are based on the predictions of a
meso-scale finite element model, with appropriate adjustment to
match their predictions with the experimental results for a few
key parameters. Through comparisons with the large test database,
all three bond-slip models are shown to provide accurate predictions
of both the bond strength (i.e. ultimate load) and the strain
distribution in the FRP plate.
KEYWORDS: FRP, concrete, bond, bond-slip
models, bond strength, pull tests, finite element simulation,