Page 8 - June-Month

TECHNICAL PAPER

Figure 4(a): Schematic of loading beam at the edge of the deck
overhang (all dimensions are in mm)

Figure 4(b): Side view of test specimen showing position of threaded
rods in relation to the deck and specimen

Figure 4(c): Front view of test specimen showing the loading beam and Figure 4(d): Top view of test setup
linear potentiometers
the strong floor of the testing facility. The load was transferred As seen in Figure 4(b), one of the threaded rods is set outside
through two 44.5 mm diameter threaded rods to a steel loading the deck specimen, whereas the second is inserted in the
beam positioned 76 mm on-center back from the end of the groove cut in the deck surface to separate the specimens.
overhang section of the deck. A 51 mm thick and 152 mm wide Instrumentation for purposes of measurement and monitoring
elastomeric bearing pad was placed between the steel beam consisted of linear potentiometers, load cells, and in the case
and the deck slab in order to reduce stress concentrations of the FRP strips, strain gauges. 12 potentiometers were used
and provide more even loading of the test specimen as shown to measure deflections of the slab as shown schematically
schematically in Figure 4(a), as a side view in Figure 4(b) in Figure 5(a). It is noted that the schematic represents the
indicating placement of the threaded rods in relation to the deck FRP-strengthened slab test section, but the configuration is
and specimen, as a front view showing linear potentiometers in a mirror image for the as-built test section. The deflection of
Figure 4(c), and with the overall test setup viewed from the top the elastomeric bearing pad was measured using four linear
in Figure 4(d). potentiometers placed at each corner of the loading beam. Of

Figure 5(a): Schematic of positioning of linear potentiometers. The figure on the left is the plan view of the entire specimen and that on the right
provides details on the deck section being tested. (all dimensions are in mm)

12 THE INDIAN CONCRETE JOURNAL | JUNE 2021