Near-surface mounted (NSM)
fiber-reinforced polymer (FRP) reinforcement has proven effective for strengthening
reinforced concrete (RC) structures and is gaining increasing attention. The
NSM reinforcement is installed by grooving the surface of the member to be
strengthened and embedding FRP bars or strips in the grooves with an
appropriate binder. In this paper bond tests conducted on short NSM-bar
anchorages are presented and results are evaluated to determine the effect of
the test variables on local bond-slip
behavior and development
capacity.
Parameters of the present study are the groove depth and width to depth ratio
and the mechanical properties of the groove-filling epoxy. During the tests,
conducted with a direct shear setup using a specifically suited pulling
machine, the loaded-end and free-end slips and the strain distributions in the
transverse plane were monitored. The local bond-slip curves obtained from the
tests are modelled analytically and used to predict the capacity of a previous
series of long bond length specimens characterized by the same other test
variables.