Title:
Exploratory Study of Using Hybrid Glass Fiber-Reinforced Polymer-Steel Bars in Reinforced Concrete Columns to Improve Seismic Performance
Author(s):
Anmol S. Srivastava, Girish N. Prajapati, and Brahim Benmokrane
Publication:
Structural Journal
Volume:
122
Issue:
4
Appears on pages(s):
229-243
Keywords:
design codes; ductility; energy dissipation capacity; glass fiber-reinforced polymer (GFRP); hybrid reinforcement; hysteresis response; quasi-static cyclic load; reinforced concrete (RC) columns; residual deformation; seismic load; stiffness degradation.
DOI:
10.14359/51745488
Date:
7/1/2025
Abstract:
The present study demonstrates the feasibility of using longitudinal
hybrid reinforcement in concrete columns in seismic zones. In this
research, four concrete columns were constructed and subjected
to quasi-static cyclic loading, featuring a combination of steel
and glass fiber-reinforced polymer (GFRP) longitudinal reinforcement. Two reference columns were fabricated and reinforced in the longitudinal direction with steel bars. These columns had a 400 x 400 mm (15.8 x 15.8 in.) cross section and 1850 mm (72.8 in.) overall height. All the columns were reinforced with GFRP crossties and spirals in the horizontal direction. The variable parameters were the transverse reinforcement spacing, axial load ratio, and column configuration. The outcomes of this research clearly showed that reinforced concrete (RC) columns that are properly designed and detailed longitudinally with hybrid reinforcement (GFRP/steel) could achieve the drift limitation in building codes with no strength degradation. Further, these hybrid-RC columns displayed enhanced energy dissipation capacity, superior ductility, and improved post-earthquake recoverability compared to columns reinforced longitudinally with steel. The promising results of this study represent a step toward the use of longitudinal hybrid reinforcement in lateral-resisting systems.
Related References:
AASHTO, 2018, “AASHTO LRFD Bridge Design Guide Specifications for GFRP-Reinforced Concrete,” second edition, American Association of State Highway and Transportation Officials, Washington, DC, 121 pp.
ACI Committee 440, 2022, “Building Code Requirements for Structural Concrete Reinforced with Glass Fiber-Reinforced Polymer (GFRP) Bars—Code and Commentary (ACI CODE-440.11-22),” American Concrete Institute, Farmington Hills, MI, 260 pp.
Adimi, M. R.; Rahman, A. H.; and Benmokrane, B., 2000, “New Method for Testing Fiber-Reinforced Polymer Rods under Fatigue,” Journal of Composites for Construction, ASCE, V. 4, No. 4, Nov., pp. 206-213. doi: 10.1061/(ASCE)1090-0268(2000)4:4(206)
AlAjarmeh, O. S.; Manalo, A. C.; Benmokrane, B.; Vijay, P. V.; Ferdous, W.; and Mendis, P., 2019, “Novel Testing and Characterization of GFRP Bars in Compression,” Construction and Building Materials, V. 225, Nov., pp. 1112-1126. doi: 10.1016/j.conbuildmat.2019.07.280
ASCE/SEI 7-16, 2017, “Minimum Design Loads and Associated Criteria for Buildings and Other Structures,” American Society of Civil Engineers, Reston, VA, 889 pp.
ASTM C39/C39M-18, 2018, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens,” ASTM International, West Conshohocken, PA, 8 pp.
ASTM D7205/D7205M-21, 2021, “Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars,” ASTM International, West Conshohocken, PA, 13 pp.
ASTM D7914/D7914M-21, 2021, “Standard Test Method for Strength of Fiber Reinforced Polymer (FRP) Bent Bars in Bend Locations,” ASTM International, West Conshohocken, PA, 6 pp.
Benmokrane, B., and Rahman, H., eds., 1998, Durability of Fiber Reinforced Polymer (FRP) Composites for Construction: Proceedings of the First International Conference (CDCC'98), Sherbrooke, QC, Canada, Aug. 5-7, 1998, 706 pp.
Benmokrane, B.; Manalo, A.; Bouhet, J.-C.; Mohamed, K.; and Robert, M., 2017, “Effects of Diameter on the Durability of Glass Fiber–Reinforced Polymer Bars Conditioned in Alkaline Solution,” Journal of Composites for Construction, ASCE, V. 21, No. 5, Oct., p. 04017040. doi: 10.1061/(ASCE)CC.1943-5614.0000814
Cai, Z.-K.; Yuan, W.; Wang, Z.; and Smith, S. T., 2021, “Seismic Behavior of Precast Segmental Bridge Columns Reinforced with Hybrid FRP-Steel Bars,” Engineering Structures, V. 228, Feb., Article No. 111484. doi: 10.1016/j.engstruct.2020.111484
Christopoulos, C.; Pampanin, S.; and Priestley, M. J. N., 2003, “Performance-Based Seismic Response of Frame Structures Including Residual Deformations. Part I: Single-Degree of Freedom Systems,” Journal of Earthquake Engineering, V. 7, No. 1, pp. 97-118. doi: 10.1080/13632460309350443
CSA S806-12 (R2021), 2012, “Design and Construction of Building Structures with Fibre-Reinforced Polymers (Reaffirmed in 2021),” CSA Group, Toronto, ON, Canada, 201 pp.
CSA S807:19, 2019, “Specification for Fibre-Reinforced Polymers,” CSA Group, Toronto, ON, Canada, 67 pp.
Davis, P. M.; Janes, T. M.; Eberhard, M. O.; and Stanton, J. F., 2012, “Unbonded Pre-Tensioned Columns for Bridges in Seismic Regions,” PEER Report 2012/04, Pacific Earthquake Engineering Research Center, University of California, Berkeley, Berkeley, CA, 144 pp.
Desroches, R., and Smith, B., 2004, “Shape Memory Alloys in Seismic Resistant Design and Retrofit: A Critical Review of Their Potential and Limitations,” Journal of Earthquake Engineering, V. 8, No. 3, pp. 415-429.
ElGawady, M. A., and Sha’lan, A., 2011, “Seismic Behavior of Self-Centering Precast Segmental Bridge Bents,” Journal of Bridge Engineering, ASCE, V. 16, No. 3, May, pp. 328-339. doi: 10.1061/(ASCE)BE.1943-5592.0000174
Elshamandy, M. G.; Farghaly, A. S.; and Benmokrane, B., 2018, “Experimental Behavior of Glass Fiber-Reinforced Polymer-Reinforced Concrete Columns under Lateral Cyclic Load,” ACI Structural Journal, V. 115, No. 2, Mar., pp. 337-349. doi: 10.14359/51700985
FEMA P-58-1, 2018, “Seismic Performance Assessment of Buildings: Volume 1 – Methodology,” second edition, Federal Emergency Management Agency, Washington, DC, 340 pp.
Guérin, M.; Mohamed, H. M.; Benmokrane, B.; Nanni, A.; and Shield, C. K., 2018, “Eccentric Behavior of Full-Scale Reinforced Concrete Columns with Glass Fiber-Reinforced Polymer Bars and Ties,” ACI Structural Journal, V. 115, No. 2, Mar., pp. 489-499. doi: 10.14359/51701107
Hu, R.; Fang, Z.; Benmokrane, B.; and Fang, W., 2021, “Cyclic Behaviour of UHPC Columns with Hybrid CFRP/Steel Reinforcement Bars,” Engineering Structures, V. 238, July, Article No. 112245. doi: 10.1016/j.engstruct.2021.112245
Hwang, S. K.; Lim, B. H.; Kim, C. G.; Yun, H. D.; and Park, W. S., 2005, “Effects of Transverse Reinforcement on Strength and Ductility of High-Strength Concrete Columns,” Architectural Research, V. 7, No. 1, pp. 39-48.
Iemura, H.; Takahashi, Y.; and Sogabe, N., 2006, “Two-Level Seismic Design Method Using Post-Yield Stiffness and Its Application to Unbonded Bar Reinforced Concrete Piers,” Structural Engineering/Earthquake Engineering, V. 23, No. 1, pp. 109-116. doi: 10.2208/jsceseee.23.109s
Jia, D.; Mao, J.; Lv, J.; Zhang, W.; and Sun, J., 2023, “Seismic Performance of Fibre-Reinforced Polymer and Steel Double-Reinforced Bridge Piers,” Structure and Infrastructure Engineering, V. 19, No. 3, pp. 291-301. doi: 10.1080/15732479.2021.1944225
Johnson, D. T., and Sheikh, S. A., 2013, “Performance of Bent Stirrup and Headed Glass Fibre Reinforced Polymer Bars in Concrete Structures,” Canadian Journal of Civil Engineering, V. 40, No. 11, Nov., pp. 1082-1090. doi: 10.1139/cjce-2012-0522
JRA, 2019, “Specifications for Highway Bridges: Part V: Seismic Design,” Japan Road Association, Tokyo, Japan, 123 pp.
Kassem, C.; Farghaly, A. S.; and Benmokrane, B., 2011, “Evaluation of Flexural Behavior and Serviceability Performance of Concrete Beams Reinforced with FRP Bars,” Journal of Composites for Construction, ASCE, V. 15, No. 5, Oct., pp. 682-695. doi: 10.1061/(ASCE)CC.1943-5614.0000216
Kharal, Z., and Sheikh, S. A., 2018, “Seismic Performance of Square Concrete Columns Confined with Glass Fiber–Reinforced Polymer Ties,” Journal of Composites for Construction, ASCE, V. 22, No. 6, Dec., p. 04018054. doi: 10.1061/(ASCE)CC.1943-5614.0000884
Koch, G. H.; Brongers, M. P. H.; Thompson, N. G.; Virmani, Y. P.; and Payer, J. H., 2002, “Corrosion Cost and Preventive Strategies in the United States,” Report No. FHWA-RD-01-156, Federal Highway Administration, Turner-Fairbank Highway Research Center, McLean, VA, 786 pp.
Lounis, Z., and Daigle, L., 2008, “Reliability-Based Decision Support Tool for Life Cycle Design and Management of Highway Bridge Decks,” Proceedings of the 2008 Annual Conference and Exhibition of the Transportation Association of Canada: Transportation: Transportation – A Key to a Sustainable Future, Toronto, ON, Canada, pp. 1-19.
Mohamed, N.; Farghaly, A. S.; Benmokrane, B.; and Neale, K. W., 2014, “Experimental Investigation of Concrete Shear Walls Reinforced with Glass Fiber–Reinforced Bars under Lateral Cyclic Loading,” Journal of Composites for Construction, ASCE, V. 18, No. 3, June, p. A4014001. doi: 10.1061/(ASCE)CC.1943-5614.0000393
Nikbakht, E.; Rashid, K.; Hejazi, F.; Osman, S. A.; and Mohseni, I., 2013, “Seismic Performance of Self-Centering Precast Post-Tensioned Bridge Columns with SMA Bars,” International Journal of Advancements Civil Structural and Environmental Engineering, V. 1, No. 1, pp. 24-27.
NRC, 2015, “National Building Code of Canada (NBC) 2015,” Canadian Commission on Building and Fire Codes, National Research Council Canada, Ottawa, ON, Canada.
Osman, S. M. S.; Aldabagh, S.; Alam, M. S.; and Sheikh, S. A., 2023, “Performance-Based Seismic Design of Hybrid GFRP–Steel Reinforced Concrete Bridge Columns,” Journal of Composites for Construction, ASCE, V. 27, No. 2, Apr., p. 04023011. doi: 10.1061/JCCOF2.CCENG-3991
Pantelides, C. P.; Gibbons, M. E.; and Reaveley, L. D., 2013, “Axial Load Behavior of Concrete Columns Confined with GFRP Spirals,” Journal of Composites for Construction, ASCE, V. 17, No. 3, June, pp. 305-313. doi: 10.1061/(ASCE)CC.1943-5614.0000357
Park, R., 1988, “State-of-the Art Report: Ductility Evaluation from Laboratory and Analytical Testing,” Proceedings of the Ninth World Conference on Earthquake Engineering (9WCEE), V. VIII, Tokyo-Kyoto, Japan, Aug., pp. 605-616.
Pettinga, D.; Christopoulos, C.; Pampanin, S.; and Priestley, N., 2007, “Effectiveness of Simple Approaches in Mitigating Residual Deformations in Buildings,” Earthquake Engineering & Structural Dynamics, V. 36, No. 12, Oct., pp. 1763-1783. doi: 10.1002/eqe.717
Pettinga, D.; Pampanin, S.; Christopoulos, C.; and Priestley, N., 2006, “Accounting for Residual Deformations and Simple Approaches to Their Mitigation,” Proceedings of the First European Conference on Earthquake Engineering and Seismology 2006 (1st ECEES), V. 3, Geneva, Switzerland, Sept., pp. 1852-1861.
Prajapati, G. N.; Farghaly, A. S.; and Benmokrane, B., 2022a, “Behavior of Reinforced Concrete Columns with Hybrid Reinforcement (Steel/Glass Fiber-Reinforced Polymer) under Reversed Cyclic Load,” ACI Structural Journal, V. 119, No. 4, July, pp. 141-155.
Prajapati, G. N.; Farghaly, A. S.; and Benmokrane, B., 2022b, “Performance of Concrete Columns Longitudinally Reinforced with Steel and GFRP Bars and Confined with GFRP Spirals and Crossties under Reversed Cyclic Loading,” Engineering Structures, V. 270, Nov., Article No. 114863. doi: 10.1016/j.engstruct.2022.114863
Prajapati, G. N.; Farghaly, A. S.; and Benmokrane, B., 2023, “Energy Dissipation of Concrete Columns Confined with GFRP Ties Under Reversed Cyclic Loading,” Proceedings of the Canadian Society of Civil Engineering Annual Conference 2021: CSCE21 Structures Track Volume 1, S. Walbridge, M. Nik-Bakht, K. T. W. Ng, M. Shome, M. S. Alam, A. El Damatty, and G. Lovegrove, eds., Springer, Singapore, pp. 635-646.
Priestley, M. J. N.; Seible, F.; and Calvi, G. M., 1996, Seismic Design and Retrofit of Bridges, John Wiley & Sons, Inc., New York, 686 pp.
Qiang, H.; Feng, P.; and Qu, Z., 2019, “Seismic Responses of Postyield Hardening Single–Degree-of-Freedom Systems Incorporating High-Strength Elastic Material,” Earthquake Engineering & Structural Dynamics, V. 48, No. 6, May, pp. 611-633. doi: 10.1002/eqe.3151
Saiidi, M. S.; O’Brien, M.; and Sadrossadat-Zadeh, M., 2009, “Cyclic Response of Concrete Bridge Columns Using Superelastic Nitinol and Bendable Concrete,” ACI Structural Journal, V. 106, No. 1, Jan.-Feb., pp. 69-77.
Sakai, J.; Jeong, H.; and Mahin, S. A., 2006, “Reinforced Concrete Bridge Columns that Re-Center Following Earthquakes,” Proceedings of the 8th U.S. National Conference on Earthquake Engineering (8NCEE), San Francisco, CA.
Sun, Z.-Y.; Wu, G.; Wu, Z.-S.; and Zhang, M., 2011, “Seismic Behavior of Concrete Columns Reinforced by Steel-FRP Composite Bars,” Journal of Composites for Construction, ASCE, V. 15, No. 5, Oct., pp. 696-706. doi: 10.1061/(ASCE)CC.1943-5614.0000199
Tavassoli, A., and Sheikh, S. A., 2017, “Seismic Resistance of Circular Columns Reinforced with Steel and GFRP,” Journal of Composites for Construction, ASCE, V. 21, No. 4, Aug., p. 04017002. doi: 10.1061/(ASCE)CC.1943-5614.0000774
Tavassoli, A.; Liu, J.; and Sheikh, S., 2015, “Glass Fiber-Reinforced Polymer-Reinforced Circular Columns under Simulated Seismic Loads,” ACI Structural Journal, V. 112, No. 1, Jan.-Feb., pp. 103-114. doi: 10.14359/51687227
Tazarv, M., and Saiidi, M. S., 2013, “Analytical Studies of the Seismic Performance of a Full-Scale SMA-Reinforced Bridge Column,” International Journal of Bridge Engineering, V. 1, No. 1, pp. 37-50.
Tobbi, H.; Farghaly, A. S.; and Benmokrane, B., 2014a, “Behavior of Concentrically Loaded Fiber-Reinforced Polymer Reinforced Concrete Columns with Varying Reinforcement Types and Ratios,” ACI Structural Journal, V. 111, No. 2, Mar.-Apr., pp. 375-385.
Tobbi, H.; Farghaly, A. S.; and Benmokrane, B., 2014b, “Strength Model for Concrete Columns Reinforced with Fiber-Reinforced Polymer Bars and Ties,” ACI Structural Journal, V. 111, No. 4, July-Aug., pp. 789-798. doi: 10.14359/51686630
Wu, G.; Sun, Z. Y.; Wu, Z. S.; and Luo, Y. B., 2012, “Mechanical Properties of Steel-FRP Composite Bars (SFCBs) and Performance of SFCB Reinforced Concrete Structures,” Advances in Structural Engineering, V. 15, No. 4, Apr., pp. 625-635.
Wu, Z.; Fahmy, M. F. M.; and Wu, G., 2009, “Safety Enhancement of Urban Structures with Structural Recoverability and Controllability,” Journal of Earthquake and Tsunami, V. 3, No. 3, Sept., pp. 143-174. doi: 10.1142/S1793431109000561
Zatar, W. A., and Mutsuyoshi, H., 2002, “Residual Displacements of Concrete Bridge Piers Subjected to Near Field Earthquakes,” ACI Structural Journal, V. 99, No. 6, Nov.-Dec., pp. 740-749.