Effect of Fire on Concrete Contribution to Shear Resistance of GFRP RC Beams
DOI:
https://doi.org/10.56830/IJSIE06202303Keywords:
GFRP bars, reinforced concrete beams, fire, shear capacity, crack patterns, modes of failure.Abstract
The use of fiber-reinforced polymer (FRP) bars is becoming commonplace in various civil engineering applications due to the several advantages they offer over traditional materials. However, limited knowledge about some aspects of the behavior of FRP bars, particularly when subjected to severe fires, is hampering their widespread use. This paper presents the results of a research program to investigate the shear behavior of glass-FRP (GFRP)-reinforced beams exposed to severe fires. Three reinforced concrete (RC) beam specimens with a cross-sectional width and height of 150 mm and 300 mm, respectively, and with a total length of 1700 mm were constructed and tested under four-point bending load up to failure. The main test variables were the reinforcement ratio and the fire. The experimental results show that all beams failed as a result of diagonal tension cracking. The shear resistance and stiffness of the RC beams decreased when the beams are exposed to fire at the same reinforcement ratio.
References
ACI, 4.-0. (2004). Guide test methods for fiber-reinforced polymers (FRPs) for reinforcing or strengthening concrete structures, ACI Committee 440. American Concrete Institute, Farmington Hills, Michigan, USA.
American, C. I. (2015). Guide for the design and construction of concrete reinforced with FRP bars. ACI 440.1R-15, Farmington Hills, MI.
ASCE-ACI, C. 4. (1998). Recent approaches to shear design of structures. J. Struct. Eng., 10.1061/ (ASCE) 0733-9445(1998)124:12(1375), 1375–1417. DOI: https://doi.org/10.1061/(ASCE)0733-9445(1998)124:12(1375)
ASTM, D. (2011). Tensile properties of fiber reinforced polymer matrix composite bars. ASTM International, West Conshohocken, PA.
ASTM. (2015). Standard test methods for fire tests of building construction and materials. ASTM E119. West Conshohocken, PA: ASTM.
C39/C39M-18., A. (2018). Standard test method for compressive strength of cylindrical concrete specimens. ASTM International, West Conshohocken, PA.
Canadian, S. A. (2019). Canadian highway bridge design code. CSA S6-19, Rexdale, Ontario, Canada.
CSA, C. S. (2012). – Re-approved in 2017 –. Design and construction of building components with fiber reinforced polymers. CSA S806-12. Rexdale, Ontario, Canada.
Gooranorimi, O., Claure, G., De Caso, F., Suaris, W., & Nanni, A. (2018). Post-fire behavior of GFRP bars and GFRP-RC slabs. Journal of Materials in Civil Engineering, 30(3), 04017296. DOI: https://doi.org/10.1061/(ASCE)MT.1943-5533.0002168
Hajiloo, H., Green, M. F., Noël, M., Bénichou, N., & Sultan, M. (2019). GFRPreinforced concrete slabs: fire resistance and design efficiency. Journal of Composites for Construction, 23(2), 04019009.
Hajiloo, H., Green, M. F., Noël, M., Bénichou, N., & Sultan., M. (2017). Fire tests on full-scale FRP reinforced concrete slabs. Compos. Struct. 179, 705–719. DOI: https://doi.org/10.1016/j.compstruct.2017.07.060
Hajiloo, H.; Green, M. F.; Noël, M.; Bénichou, N.; Sultan, M. (2019). GFRPreinforced concrete slabs: fire resistance and design efficiency. Journal of Composites for Construction, 23(2), 04019009. DOI: https://doi.org/10.1061/(ASCE)CC.1943-5614.0000937
MacGregor, J. G., & Wight, J. K. (2005). Reinforced concrete: Mechanics and design. 4th Ed. Prentice-Hall, Upper Saddle River, NJ.
Nigro, E., G. Cefarelli, A., Bilotta, G. M., & Cosenza, E. (2011). Fire resistance of concrete slabs reinforced with FRP bars. Part I: Experimental investigations on the mechanical behavior. Composites Part B 42 (6), 1739–1750. DOI: https://doi.org/10.1016/j.compositesb.2011.02.025
