Abstract
The use of fiber reinforced polymer (FRP) bars in reinforced concrete members enhances corrosion resistance when compared to traditional steel reinforcing bars. Although there is ample research available on the behavior of FRP bars and concrete members reinforced with FRP bars under elevated temperatures (due to fire), there is little published information available on their post-fire residual load capacity. This paper reports residual tensile strength, modulus of elasticity, and bond strength (to concrete) of glass fiber reinforced polymer (GFRP) bars after exposure to elevated temperatures of up to 400 °C and subsequent cooling to an ambient temperature. The results showed that the residual strength generally decreases with increasing temperature exposure. However, as much as 83% of the original tensile strength and 27% of the original bond strength was retained after the specimens were heated to 400 °C and then cooled to ambient temperature. The residual bond strength is a critical parameter in post-fire strength assessments of GFRP-reinforced concrete members.
Highlights
IntroductionCorrosion resistance and a superior strength-to-weight ratio are among the beneficial properties that have generated interest in fiber-reinforced polymer (FRP) reinforcing bars as a viable replacement for steel bars in reinforced concrete structural members [1]
The study reported in this paper provides experimental data on the strength and stiffness of glass fiber reinforced polymer (GFRP) bars with prior exposure to high temperatures
Substantial information exists regarding the performance of fiber-reinforced polymer (FRP) bars under high-temperature conditions, data on residual tensile strength and bond properties after cooling are not widely available
Summary
Corrosion resistance and a superior strength-to-weight ratio are among the beneficial properties that have generated interest in fiber-reinforced polymer (FRP) reinforcing bars as a viable replacement for steel bars in reinforced concrete structural members [1]. Common FRP bars include glass fibers (GFRP), carbon fibers (CFRP), or aramid fibers (AFRP) in a polymer resin matrix. The fiber strands provide the primary tensile strength for the bars, while the polymer resin matrix serves as the binder. GFRP bars are the most commonly used FRP bars for civil-structural applications and are generally used in non-prestressed concrete members [2]. The application of GFRP bars in concrete is addressed in several standards, [2,3,4,5]
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