Comparative study on the tensile mechanical behavior of GFRP bars under and after high temperature exposure
Source abstract
Abstract
Glass fiber-reinforced polymer (GFRP) bars are being increasingly used in reinforced concrete structures to replace ordinary steel reinforcements as an effective and economical solution to corrosion problems. The mechanical behavior of GFRP bars under and after high temperature exposure is crucial for their application in structures potentially subjected to fire, and further research and comparisons are needed to increase the accuracy of fire-resistant design and post-fire analytical model of GFRP reinforced concrete members. Thus, this paper aimed to study the residual tensile performances of GFRP bars under and after high temperature exposure. The stress–strain curves, tensile strengths, elastic modulus, and ultimate strains of GFRP bar specimens while being subjected to, and after, different high temperatures were tested and compared. The effects of high temperature on the degradation mechanisms of GFRP bars were investigated using scanning electronic microscopy. The results showed that carbonization of resin and exposure of fibers in GFRP bars occurred gradually as the temperature increased. At the same temperature, the tensile failure modes and stress–strain relationships for specimens under and after high temperature were similar. However, the residual tensile strengths and ultimate strains on GFRP bars after high temperatures were greater than those under high temperatures, which ranged from 150 ℃ to 350 ℃, indicating that the different values of those mechanical properties should be taken into account in the analysis of fire resistance and the post-fire identification of concrete structures reinforced with GFRP bars. Finally, regressive models for the residual tensile strengths and elastic moduli of GFRP bars under and after high temperature exposure, respectively, were developed, based on the results of this experiment and previous studies. The calculated results correlated well with the experimental results.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Fire effects on concrete materials · Structural Behavior of Reinforced Concrete · Innovative concrete reinforcement materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (35)
Show source-provided references
1. Comparative investigation on tensile performance of FRP bars after exposure to water, seawater, and alkaline solutions10.1061/(ASCE)MT.1943-5533.0003243 ↗
2. Experimental studies on chloride penetration and steel corrosion in cracked concrete beams under drying-wetting cycles10.1061/(ASCE)MT.1943-5533.0001953 ↗
3. GFRP reinforcement in concrete after 15 years of service10.1061/(ASCE)CC.1943-5614.0000806 ↗
4. Bond between carbon fiber reinforced polymer bars and concrete. I: Experimental study10.1061/(ASCE)1090-0268(2003)7:2(154) ↗
5. Properties of concrete at elevated temperatures
6. Thermal and mechanical properties of concrete and its constituents at elevated temperatures: a review
7. Bond strength of GFRP reinforcing bars at high temperatures with implications for performance in fire10.1061/(ASCE)CC.1943-5614.0000897 ↗
8. Residual stress–strain relationship for concrete after exposure to high temperatures10.1016/j.cemconres.2006.05.029 ↗
9. Mechanical properties of pultruded carbon fibre-reinforced polymer (CFRP) plates at elevated temperatures10.1016/j.engstruct.2011.03.006 ↗
10. Effect of temperature on strength and stiffness properties of near-surface mounted FRP reinforcement10.1016/j.compositesb.2013.10.055 ↗
11. Mechanical behaviour of pultruded glass fibre reinforced polymer composites at elevated temperature: experiments and model assessment10.1016/j.compstruct.2012.10.051 ↗
12. The effect of mechanical and thermal properties of FRP bars on their tensile performance under elevated temperatures10.1016/j.conbuildmat.2017.09.160 ↗
13. Models for predicting elastic modulus and tensile strength of carbon, basalt and hybrid carbon-basalt FRP laminates at elevated temperatures10.1016/j.conbuildmat.2016.03.175 ↗
14. Variation of strength and stiffness of fibre reinforced polymer reinforcing bars with temperature10.1016/j.cemconcomp.2005.03.012 ↗
15. The tensile performance of FRP bars embedded in concrete under elevated temperatures10.1016/j.conbuildmat.2019.03.239 ↗
16. Performance of glass fiber reinforced polymer bars under elevated temperatures10.1016/j.compositesb.2012.01.034 ↗
17. Residual behaviour of glass FRP bars subjected to high temperatures10.1016/j.compstruct.2018.07.077 ↗
18. Behavior of GFRP reinforcing bars subjected to extreme temperatures10.1061/(ASCE)CC.1943-5614.0000092 ↗
19. Y.L. Yang, Experimental Study on Tensile Property of FRP Bars and Bond Behavior Between FRP Bars and Concrete after High Temperature, Zhengzhou University, China, 2013. (in Chinese).
20. Mechanical properties of heat-treated high strength steel under fire/post-fire conditions10.1016/j.jcsr.2014.02.003 ↗
21. In-fire and postfire mechanical properties of duplex stainless steel S2205310.1061/(ASCE)MT.1943-5533.0002842 ↗
22. Mechanical properties of structural steel at elevated temperatures and after cooling down10.1002/fam.849 ↗
23. Investigation on the mechanical of concrete at and after elevated temperature behavior
24. Effect of elevated temperatures and cooling regimes on normal strength concrete10.1002/fam.987 ↗
25. The compressive behaviour of natural and recycled aggregate concrete during and after exposure to elevated temperatures
26. GB/T 30022-2013, Test method for Basic Mechanical Properties of Fiber Reinforced Polymer Bar, China National Standardization Management Committee, Beijing, 2013 (in Chinese).
27. H. Hajiloo, M. Green, Post-fire Residual Strength of Glass Fiber Reinforced Polymer (GFRP) Bars, CSCE, London, 2016.
28. Test study on bond behavior between GFRP bar and concrete in high temperature
29. Property modeling across transition temperatures in PMC’s: Part I. Tensile properties10.1023/A:1011282704357 ↗
30. Elevated temperature behaviour of carbon fibre-reinforced polymer applied by hand lay-up (M-CFRP) under simultaneous thermal and mechanical loadings: experimental and analytical investigation10.1016/j.firesaf.2018.07.007 ↗
31. Fire properties of polymer composite materials
32. L.A. Bisby, Fire Behaviour of Fibre-reinforced Polymer (FRP) Reinforced Or Confined Concrete, Queen's University at Kingston, Canada, 2003.
33. Experimental investigation into mechanical behavior of GFRP rebars at elevated temperature
34. Longitudinal tensile properties of FRP bars after high temperatures
35. Y.N. Fu, Research on Elevated Temperature Property of Glass Fiber Polymer Rebar, Zhengzhou University, China, 2009. (in Chinese).