The ultimate
strain for the FRP bars is 1.7%. The CFRP grid used for
transverse confinement was a high-performance reinforcement
made by bonding ultra-high-strength carbon tows
with epoxy resin in a controlled factory environment. The
grid was composed of a square mesh of carbon strands
spaced at 2.9 × 2.9 in. (72 × 72 mm). Table 1 describes
the typical grid properties and the physical properties of
the CFRP strand.