FRP bar properties - Reinforced Concrete with FRP Bars: Mechanics and Design - page 48

12

Pull-out

Beam

8

4

Embedment length = 10 d b

0

0 0.1 0.2 0.3 0.4

Free-end Slip (mm)

Figure 3.12 Comparison of the test results obtained by direct pullout versus beam-type
pullout on no. 4 GFRP bar.

to create S-N curves for a particular set of testing conditions where the
principal variable is the maximum value of the repeated load. At least five
specimens at each level of load are required.
Test method for determining the effect of corner radius on tensile
strength of FRP bars (test method B.12). The effect of the corner radius on
tensile strength of the FRP bar is measured using a unique fixture. The test
consists in pulling the straight sides of a reverse-U shaped FRP bar while
the fixture, reacting against the testing machine frame, allows transferring
the load to the bent portion. A photographic view of the test setup, a sche-
matic view, and a typical failure mode of a bent GFRP bar are shown in
Figure (3.14). At the least, five specimens are required.

3.3 PRODUCT CERTIFICATION AND
QUALITY ASSURANCE

Product certification and quality assurance during FRP manufacturing are
critical to ensure that what is specified by the engineer eventually ends up
at the construction site for the contractor to install. Permitted constituent