Introduction
Fibre-reinforced polymer (FRP) jackets have been widely
used in practice as a confining material for concrete columns
to achieve significant enhancements in both strength and
ductility [1–3]. As the design of such jackets requires an
accurate stress–strain model for the concrete they confine
(FRP–confined concrete), extensive recent research has been
carried out on the stress–strain behaviour of FRP–confined
concrete, from which a number of stress–strain models have
resulted. These models fall into two main categories: (1)
design-oriented models and (2) analysis-oriented models. The
former models are generally in closed-form equations directly
derived from test results, treating FRP–confined concrete
as a single “composite” material, and are thus simple and
convenient to apply in design. By contrast, the latter models
treat the FRP jacket and the concrete core separately, and
predict the behaviour of FRP–confined concrete by an explicit
account of the interaction between the FRP jacket and the
confined concrete core via radial displacement compatibility
IntroductionFibre-reinforced polymer (FRP) jackets have been widelyused in practice as a confining material for concrete columnsto achieve significant enhancements in both strength andductility [1–3]. As the design of such jackets requires anaccurate stress–strain model for the concrete they confine(FRP–confined concrete), extensive recent research has beencarried out on the stress–strain behaviour of FRP–confinedconcrete, from which a number of stress–strain models haveresulted. These models fall into two main categories: (1)design-oriented models and (2) analysis-oriented models. Theformer models are generally in closed-form equations directlyderived from test results, treating FRP–confined concreteas a single “composite” material, and are thus simple andconvenient to apply in design. By contrast, the latter modelstreat the FRP jacket and the concrete core separately, andpredict the behaviour of FRP–confined concrete by an explicitaccount of the interaction between the FRP jacket and theconfined concrete core via radial displacement compatibility
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