Ellis Devon S, Tabatabai Habib, Nabizadeh Azam
Ellis Engineering & Construction Management Services, LLC, Milwaukee, WI 53212, USA.
Department of Civil and Environmental Engineering, University of Wisconsin, Milwaukee, WI 53211, USA.
Materials (Basel). 2018 Feb 27;11(3):346. doi: 10.3390/ma11030346.
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.
与传统钢筋相比，在钢筋混凝土构件中使用纤维增强聚合物（FRP）筋可增强耐腐蚀性。尽管已有大量关于FRP筋以及FRP筋增强混凝土构件在高温（火灾引起）下性能的研究，但关于其火灾后残余承载能力的公开信息却很少。本文报告了玻璃纤维增强聚合物（GFRP）筋在暴露于高达400°C的高温并随后冷却至环境温度后的残余抗拉强度、弹性模量和粘结强度（与混凝土的粘结强度）。结果表明，残余强度通常随温度暴露的增加而降低。然而，在试件加热至400°C然后冷却至环境温度后，仍保留了高达83%的原始抗拉强度和27%的原始粘结强度。残余粘结强度是GFRP增强混凝土构件火灾后强度评估中的一个关键参数。
