The average hoop strain in FRP at rupture in FRPwrapped
concrete can be much lower than the FRP
material ultimate tensile strain from flat coupon tests,
indicating the assumption that FRP ruptures when the
FRP material tensile strength reached is not valid in
the case of concrete confined by wrapped FRP. Based
on this observation, a unified stress–strain model for
concrete confined by different types of FRP must be
based on the actual hoop rupture strain of FRP rather
than the ultimate material tensile strain.