All test specimens were identical in geometry. Specimens
were 20 ft (6.1 m) long, with an outer diameter of 8.91 in.
(226 mm) and 13.23 in. (336 mm) at the tip and butt ends,
respectively, which provides an outside slope of 1.8%.
The inner diameters were 3.91 in. (99.3 mm) and 7.75 in.
(191 mm) for the tip and butt ends, respectively, with an inside
slope of 1.6%. The wall thickness was 2.5 in. (64 mm)
and 2.74 in. (69.6 mm) at the tip and butt ends, respectively.
Figure 1 shows the test specimen dimensions. The size of
the specimen was chosen to allow for easy transport from
the production plant to the structural laboratory.
The FRP bars were distributed uniformly around the cross
section (Fig. 1). CFRP grid and GFRP spirals were used
for confinement (Fig. 2 and 3).
All test specimens were identical in geometry. Specimenswere 20 ft (6.1 m) long, with an outer diameter of 8.91 in.(226 mm) and 13.23 in. (336 mm) at the tip and butt ends,respectively, which provides an outside slope of 1.8%.The inner diameters were 3.91 in. (99.3 mm) and 7.75 in.(191 mm) for the tip and butt ends, respectively, with an insideslope of 1.6%. The wall thickness was 2.5 in. (64 mm)and 2.74 in. (69.6 mm) at the tip and butt ends, respectively.Figure 1 shows the test specimen dimensions. The size ofthe specimen was chosen to allow for easy transport fromthe production plant to the structural laboratory.The FRP bars were distributed uniformly around the crosssection (Fig. 1). CFRP grid and GFRP spirals were usedfor confinement (Fig. 2 and 3).
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