Self-Centering Hybrid GFRP-Steel Reinforced Concrete Beams for Blast Resilience
Publication: Journal of Structural Engineering
Volume 147, Issue 7
Abstract
Despite having a high strength-to-weight ratio and being chemically inert, fiber-reinforced polymer (FRP) reinforcing bars are not currently used in reinforced concrete protective design due to their brittle nature and lack of ductility. This paper presents research on the innovative use of blended mixtures of FRP and steel rebar to activate self-centering behavior to return blast-loaded elements to their original position after the inertial loads are removed. Self-centering blast-resilient members promise reductions in residual damage, repair cost, and facility downtime after a terrorist bomb attack or accidental explosion. Large-scale reinforced concrete beams with different combinations of steel and glass FRP (GFRP) rebar were designed, constructed, and tested under progressively increasing blast loads generated by the Virginia Tech Shock Tube Research Facility. The results demonstrated that beams with hybrid reinforcing experienced reduced overall residual damage in comparison with similar conventionally reinforced concrete members. Increasing the self-centering ratio (SC) of beams, defined as the ratio of the restoring moment provided by the FRP to the resisting moment provided by energy dissipating steel rebar, increased the blast self-centering tendencies of the hybrid beams. Additionally, if the GFRP rebar ruptured during the blast, the presence of steel prevented a brittle failure mechanism and provided additional energy dissipation and redundancy. To encourage the use of hybrid FRP-steel reinforcement in blast-resistant construction, a series of protective design recommendations are made. Furthermore, a new response limit based on a blast self-centering index (BSI) is proposed to explicitly account for the residual damage state in the protective design process.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available in a repository or online in accordance with funder data retention policies (doi: http://hdl.handle.net/10919/99085).
Acknowledgments
The authors gratefully acknowledge the support of Mr. Doug Gremel of Owens Corning for technical assistance and for providing the GFRP rebar used in this research.
References
Abdelnaby, A. E., and A. S. Elnashai. 2012. “Response of degrading reinforced concrete systems subjected to replicate earthquake ground motions.” In Proc., 15th World Conf. on Earthquake Engineering. Lisbon, Portugal: Sociedade Portuguesa de Engenharia Sísmica.
ACI (American Concrete Institute). 2015. Guide for the design and construction of structural concrete reinforced with fiber-reinforced polymer (FRP) bars. ACI 440.1R-15. Farmington Hills, MI: ACI.
ACI (American Concrete Institute). 2019. Building code requirements for structural concrete (ACI 318-19) and commentary. ACI 318R. Farmington Hills, MI: ACI.
ASCE/SEI 2011. Blast protection of buildings. ASCE/SET 59-11. Reston, VA: ASCE.
ASTM. 2016. Standard test method for tensile properties of fiber reinforced polymer matrix composite bars. ASTM D7205. West Conshohocken, PA: ASTM.
ASTM. 2018. Test method for compressive strength of cylindrical concrete specimens. ASTM C39. West Conshohocken, PA: ASTM.
ASTM. 2020. Standard specification for deformed and plain carbon-steel bars for concrete reinforcement. ASTM A615. West Conshohocken, PA: ASTM.
CSA (Canadian Standards Association). 2012. Design and assessment of buildings subjected to blast loads. CSA Standard S850-12. Mississauga, ON: CSA.
Eatherton, M. R., X. Ma, H. Krawinkler, D. Mar, S. Billington, J. Hajjar, and G. G. Deierlein. 2014. “Design concepts for controlled rocking of self-centering steel-braced frames.” J. Struct. Eng. 140 (11): 04014082. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001047.
Emparanza, A. R., R. Kampmann, Y. De Case, and F. Basalo. 2018. “State-of-the-practice of global manufacturing of FRP rebar and specifications.” ACI Spec. Publ. 327 (45): 1–14.
Ferrier, E., L. Michel, B. Zuber, and G. Chanvillard. 2015. “Mechanical behaviour of ultra-high performance short-fibre-reinforced concrete beams with internal fibre reinforced polymer rebars.” Composites Part B Eng. 68 (Jan): 246–258. https://doi.org/10.1016/j.compositesb.2014.08.001.
Gonçalves, M. C., and F. Margarido. 2015. Materials for construction and civil engineering. Cham, Switzerland: Springer.
Jacques, E. 2011. “Blast retrofit of reinforced concrete walls and slabs.” M.A.Sc. thesis, Dept. of Civil Engineering, Univ. of Ottawa.
Jacques, E., A. Lloyd, P. Imbeau, D. Palermo, and J. Quek. 2015. “GFRP retrofitted reinforced concrete columns subjected to simulated blast loading.” J. Struct. Eng. 141 (11): 04015028. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001251.
Jacques, E., A. Lloyd, and M. Saatcioglu. 2012. “Predicting reinforced concrete response to blast loads.” Can. J. Civ. Eng. 40 (5): 427–444. https://doi.org/10.1139/L2012-014.
Jacques, E., and M. Saatcioglu. 2020. “High strain rate response of reinforced concrete lap-spliced beams.” J. Struct. Eng. 146 (1): 04019165. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002463.
Johnson, J. 2020. “Blast performance of hybrid GFRP and steel reinforced concrete beams.” MS thesis, Dept. of Civil and Environmental Engineering, Virginia Tech.
Kara, I. F., A. F. Ashour, and M. A. Köroğlu. 2015. “Flexural behavior of hybrid FRP/steel reinforced concrete beams.” Compos. Struct. 129 (Oct): 111–121. https://doi.org/10.1016/j.compstruct.2015.03.073.
Kiggins, S., and C. M. Uang. 2006. “Reducing residual drift of buckling-restrained braced frames as a dual system.” Eng. Struct. 28 (11): 1525–1532. https://doi.org/10.1016/j.engstruct.2005.10.023.
Lau, D., and H. J. Pam. 2010. “Experimental study of hybrid FRP reinforced concrete beams.” Eng. Struct. 32 (12): 3857–3865. https://doi.org/10.1016/j.engstruct.2010.08.028.
Lloyd, A., E. Jacques, M. Saatcioglu, D. Palermo, I. Nistor, and T. Tikka. 2011. Capabilities and effectiveness of using a shock tube to simulate blast loading on structures and structural components. Farmington Hills, MI: ACI.
Lloyd, A. E. W. 2015. “Blast retrofit of reinforced concrete columns.” Ph.D. thesis, Dept. of Civil and Environmental Engineering, Univ. of Ottawa.
Nanni, A. 1993. “Flexural behavior and design of RC members using FRP reinforcement.” J. Struct. Eng. 119 (11): 3344–3359. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:11(3344).
Okelo, R., and R. L. Yuan. 2005. “Bond strength of fiber reinforced polymer rebars in normal strength concrete.” J. Compos. Constr. 9 (3): 203–213. https://doi.org/10.1061/(ASCE)1090-0268(2005)9:3(203).
Owens and Corning. 2019. “Aslan 100 fiberglass rebar data sheet.” Accessed March 30, 2021. https://dcpd6wotaa0mb.cloudfront.net/mdms/dms/CSB/10022285/10022285-%E2%80%93-Aslan%E2%84%A2-100-Glass-fiber-reinforced-polymer-(GFRP)-rebars-product-sheet.pdf.
Owens and Corning. 2020. “Fiberglass Rebar.” https://www.owenscorning.com/composites/products/product-types/fiberglass-rebar.
Pang, L., W. Qu, P. Zhu, and J. Xu. 2016. “Design propositions for hybrid FRP-steel reinforced concrete beams.” J. Compos. Constr. 20 (4): 04015086. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000654.
Qu, W., X. Zhang, and H. Huang. 2009. “Flexural behavior of concrete beams reinforced with hybrid (GFRP and steel) bars.” J. Compos. Constr. 13 (5): 350–359. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000035.
Remennikov, A. M., M. Goldston, and M. N. Sheikh. 2016. “Impact resistance of ultra-high strength concrete beams with FRP reinforcement.” In Proc., 8th Int. Conf. on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE 2016), 1374–1380. Hong Kong, China: The Hong Kong Polytechnic Univ.
Teng, J. G., J. F. Chen, S. T. Smith, and L. Lam. 2002. FRP—Strengthened RC structures. West Sussex, UK: Wiley.
UFC (Unified Facilities Code). 2008. Structures to resist the effects of accidental explosions. Washington, DC: United States of America Department of Defense.
Wu, G., Z.-Q. Dong, X. Wang, Y. Zhu, and Z.-S. Wu. 2015. “Prediction of long-term performance and durability of BFRP bars under the combined effect of sustained load and corrosive solutions.” J. Compos. Constr. 19 (3): 04014058. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000517.
Yang, Y., Z. Sun, G. Wu, D. Cao, and Z. Zhang. 2020. “Flexural capacity and design of hybrid FRP-steel reinforced concrete beams.” Adv. Struct. Eng. 23 (7): 1290–1304. https://doi.org/10.1177/1369433219894236.
Yinghao, L., and Y. Yong. 2013. “Arrangement of hybrid rebars on flexural behaviour of HSC beams.” Composites, Part B 45 (1): 22–31. https://doi.org/10.1016/j.compositesb.2012.08.023.
Yoo, D., N. Banthia, and Y. Yoon. 2016. “Flexural behavior of ultra-high-performance fiber-reinforced concrete beams reinforced with GFRP and steel rebars.” Eng. Struct. 111 (Mar): 246–262. https://doi.org/10.1016/j.engstruct.2015.12.003.
Yuan, F., L. Chen, M. Chen, and K. Xu. 2018. “Behaviour of hybrid steel and FRP-reinforced concrete-ECC composite columns under reversed cyclic loading.” Sensors 18 (12): 4231. https://doi.org/10.3390/s18124231.
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Information
Published In
Journal of Structural Engineering
Volume 147 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Aug 17, 2020
Accepted: Jan 21, 2021
Published online: Apr 29, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 29, 2021
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