Abstract
Fiber reinforced polymer (FRP) bars exhibit higher thermal properties in transverse direction with respect to concrete. This difference in transverse thermal properties between FRP and concrete may affect transverse thermal deformations and consequently cracking thermal loadings producing failure of concrete cover. This paper presents a numerical study to investigate the effect of thermal and mechanical properties of FRP bars on circumferential thermal deformations of concrete cylinders axially reinforced with FRP bars under temperature increase up to 60°C using nonlinear finite element models. For concrete in tension, a stress–strain relationship with tension softening is used. Whereas, unidirectional FRP bar behavior is considered linear elastic/brittle. The numerical simulation results show significant effects of FRP bars-transverse elasticity modulus on the evolution of transverse thermal deformations in concrete cylinders reinforced with FRP bars under the temperature increase.
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