Performance of Concrete-Filled FRP Tubes under Field Close-in Blast Loading
Publication: Journal of Composites for Construction
Volume 19, Issue 4
Abstract
Blasts, whether deliberate or accidental, are a great concern for a society’s critical infrastructure as well as expeditionary military installations. Improvement to existing construction methods that enhance blast resilience can ultimately save lives and property. Concrete-filled FRP tubes (CFFTs) are known to improve a conventional reinforced concrete member’s resistance to traditional loads by strengthening, protecting, and confining the reinforced concrete core. Glass fibre reinforced polymer (GFRP) tubes are readily available in a variety of sizes suitable for use as a stay-in-place structural formwork for midsized reinforced concrete members, which can simplify and expedite construction. These advantages point to CFFTs’ great potential in resisting blast loads. This study aimed to quantify the advantages of encasing a reinforced concrete member with a GFRP tube subjected to close-in blast loading and to investigate the effects of the presence of the tube, the internal steel reinforcement ratio, and the blast scaled distance on CFFTs’ behavior under blast loading. This was accomplished by testing four CFFT and reinforced concrete specimen pairs under blast and monotonic loading. The specimens were tested in pairs to facilitate comparisons. The CFFT specimens performed significantly better than the conventional reinforced specimens, showing greater robustness with decreased localized damage and reduced residual displacements. This indicated the need for developing analysis and design procedures for this system. Therefore, a procedure for developing Pressure-Impulse diagrams for the tested CFFT specimens was outlined and their use for the design of CFFTs under close-in blast loads was explained. A numerical procedure for developing equivalent close-in blast forcing functions was also outlined.
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References
Ameron International. (1988). Series 5000 fiberglass pipe and fittings: For severely corrosive industrial service, Bondstrand Product Data, Houston.
ANSYS Autodyn [Computer software]. Canonsburg, PA, x64 Academic Research.
Bentz, E. (2000). Sectional analysis of reinforced concrete members, Ph.D. thesis, Univ. of Toronto, Toronto, ON, Canada.
Buchan, P. A., and Chen, J. F. (2007). “Blast resistance of FRP composites and polymer strengthened concrete and masonry structures—A state-of-the-art review.” Composites Part B, 38(5–6), 509–522.
Canadian Standards Association (CSA). (2004a). “Compressive strength of cylindrical concrete specimens.” A23.2-9C, Mississauga, ON, Canada.
Cole, B., and Fam, A. (2006). “Flexural load testing of concrete-filled FRP tubes with longitudinal steel and FRP rebar.” ASCE J. Compos. Constr., 161–171.
Crawford, J. E. (2013). “State of the art for enhancing the blast resistance of RC columns with FRP.” Can. J. Civ. Eng., 40(11), 1023–1033.
Elgawady, M., Booker, A., and Dawood, H. (2010). “Seismic behavior of posttensioned concrete-filled fiber tubes.” ASCE J. Compos. Constr., 616–628.
Fam, A., and Mandal, S. (2006). “Prestressed concrete–filled fiber-reinforced polymer circular tubes tested in flexure.” PCI J., 51(4), 42–54.
Fam, A., and Rizkalla, S. (2002). “Flexural behavior of concrete-filled fiber-reinforced polymer circular tubes.” ASCE J. Compos. Constr., 123–132.
Fam, A., Schnerch, D., and Rizkalla, S. (2005). “Rectangular filament-wound glass fiber reinforced polymer tubes filled with concrete under flexural and axial loading: Experimental investigation.” ASCE J. Compos. Constr., 25–33.
Flisak, B., Fam, A. Z., and Rizkalla, S. H. (2001). “FRP tubes filled with concrete and subjected to combined axial and flexural loads.” Proc., Construction Institute Sessions at the ASCE Civil Eng., 45–54.
Fujikura, S., Bruneau, M., and Lopez-Garcia, D. (2008). “Experimental investigation of multihazard resistant bridge piers having concrete-filled steel tube under blast loading.” J. Bridge Eng., 586–594.
Hansen, E., Levine, H., Lawver, D., and Tennant, D. (2006). “Computational failure analysis of reinforced concrete structures subjected to blast loading.” Proc., 17th Analysis and Computation Specialty Conf., ASCE, St. Louis, MO.
Helmi, K., Fam, A., and Mufti, A. (2008). “Fatigue life assessment and static testing of structural GFRP tubes based on coupon tests.” ASCE J. Compos. Constr., 212–223.
Krauthammer, T. (2008). Modern protective structures, CRC Press, Boca Raton, FL.
Malvar, L. J., Crawford, J. E., and Morrill, K. B. (2007). “Use of composites to resist blast.” ASCE J. Compos. Constr., 601–610.
Mandal, S. K. (2004). Prestressed concrete-filled fiber reinforced polymer tubes, Master’s thesis, Queen’s Univ., Kingston, ON, Canada.
Popovics, S. (1973). “A numerical approach to the complete stress-strain curve of concrete.” Cem. Concr. Res., 3(5), 583–599.
Qasrawi, Y. (2014). “The dynamic response of concrete filled FRP tubes subjected to blast and impact loading.” Ph.D. thesis, Queen’s Univ., Kingston, ON, Canada.
Qasrawi, Y., and Fam, A. (2008). “Flexural load tests on new spun-cast concrete-filled fiber-reinforced polymer tubular poles.” ACI Struct. J., 105(6), 750–759.
Qasrawi, Y., Heffernan, P., and Fam, A. (2010). “Numerical determination of reflected blast pressure distribution on round columns.” Proc., Conf. Structures under Shock and Impact XI, Tallinn, Estonia, 83–92.
Unified Facilities Criteria. (2002). “Design and analysis of hardened structures to conventional weapons effects.”, Dept. of Defense, Washington, DC.
Zaghi, A. E., Saiidi, M. S., and Mirmiran, A. (2012). “Shake table response and analysis of a concrete-filled FRP tube bridge column.” Compos. Struct., 94(5), 1564–1574.
Zakaib, S. E. (2013). “Flexural performance and moment connections of concrete-filled GFRP tubes (CFFTS) and CFFT-encased steel I-sections.” Master’s thesis, Queen’s Univ., Kingston, ON, Canada.
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© 2014 American Society of Civil Engineers.
History
Received: Feb 23, 2014
Accepted: Jun 11, 2014
Published online: Sep 29, 2014
Discussion open until: Feb 28, 2015
Published in print: Aug 1, 2015
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