Title:
Experimental Investigation: New Ductility-Based Force Modification Factor Recommended for Concrete Shear Walls Reinforced with Glass Fiber-Reinforced Polymer Bars
Author(s):
Ahmed Hassanein, Nayera Mohamed, Ahmed Sabry Farghaly, and Brahim Benmokrane
Publication:
Structural Journal
Volume:
116
Issue:
1
Appears on pages(s):
213-224
Keywords:
deformation; force modification factor; glass fiber-reinforced polymer; seismic; shear wall
DOI:
10.14359/51710867
Date:
1/1/2019
Abstract:
Reinforced concrete shear walls are the most common lateral-force-resisting system in reinforced concrete structures. Recent experimental studies have proven the applicability of using glass fiber-reinforced polymer (GFRP) reinforcement in lateral-resisting concrete structural systems (shear walls and columns). In this study, five concrete shear walls reinforced with GFRP bars and spirals were tested under reversed cyclic quasi-static loading and constant axial load. The main difference between the walls was the GFRP reinforcement configuration in the boundary elements. Two shear walls included boundaries reinforced with square GFRP spirals, while the third shear wall had boundaries reinforced with circular GFRP spirals. The remaining two shear walls had higher confinement of boundary elements consisting of square GFRP spiral embedded inside rectangular GFRP spiral in one and rectangular GFRP spiral with two GFRP ties in the other. The main objectives were to assess the impact of increasing the confinement level in the boundaries and the effect on inelastic deformation capacity. The walls with higher confinement clearly achieved higher drift ratios and strength. The envelope curves were bilinearly idealized. The elastic-plastic transition point and the maximum deformation limit were identified based on the seismic performance of the test specimens. The recorded inelastic rotation capacity of the test walls achieved the required level for lateral-resisting systems. Moreover, the ductility-based force modification factor was assessed and a new value of 2.4 was suggested for implementation in FRP design codes.
Related References:
ACI Committee 318, 2014, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 520 pp.
ASCE/SEI 41-13, 2013, “Seismic Evaluation and Retrofit of Existing Buildings,” American Society of Civil Engineers, Reston, VA, 518 pp.
ASTM D7205/D7205M-06(2011), 2011, “Standard Test Method for Tensile Properties of Fiber Reinforced Polymer Matrix Composite Bars,” ASTM International, West Conshohocken, PA, 13 pp.
Canadian Commission on Building and Fire Codes, 2015, “National Building Code of Canada (NBCC),” National Research Council of Canada, Montreal, QC, Canada.
Canadian Standards Association, 2014, “Design of Concrete Structures Standard (CSA A23.3-14),” Mississauga, ON, Canada, 240 pp.
Canadian Standards Association, 2012, “Design and Construction of Building Components with Fiber-Reinforced Polymers (CSA S806-12),” Mississauga, ON, Canada, 208 pp.
Cardenas, A. E.; Hanson, J. M.; Corley, W. G.; and Hognestad, E., 1973, “Design Provisions for Shear Walls,” ACI Journal Proceedings, V. 70, No. 3, pp. 221-230.
Fintel, M., 1995, “Performance of Buildings with Shear Walls in Earthquakes of the Last Thirty Years,” PCI Journal, V. 40, No. 3, pp. 62-80. doi: 10.15554/pcij.05011995.62.80
Mady, M.; El-Ragaby, A.; and El-Salakawy, E., 2011, “Seismic Behavior of Beam-Column Joints Reinforced with GFRP Bars and Stirrups,” Journal of Composites for Construction, ASCE, V. 15, No. 6, pp. 875-886. doi: 10.1061/(ASCE)CC.1943-5614.0000220
Mitchell, D.; Tremblay, R.; Karacabeyli, E.; Paultre, P.; Saatcioglu, M.; and Anderson, D. L., 2003, “Seismic Force Modification Factors for the Proposed 2005 Edition of the National Building Code of Canada,” Canadian Journal of Civil Engineering, V. 30, No. 2, pp. 308-327. doi: 10.1139/l02-111
Mohamed, N.; Farghaly, A. S.; Benmokrane, B.; and Neale, K. W., 2014a, “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, p. A04014001 doi: 10.1061/(ASCE)CC.1943-5614.0000393
Mohamed, N.; Farghaly, A. S.; Benmokrane, B.; and Neale, K. W., 2014b, “Drift Capacity Design of Shear Walls Reinforced with Glass Fiber-Reinforced Polymer Bars,” ACI Structural Journal, V. 111, No. 6, Nov.-Dec., pp. 1397-1406. doi: 10.14359/51687099
Mohamed, N.; Farghaly, A. S.; and Benmokrane, B., 2015, “Seismic Response Modification Factors for GFRP-Reinforced Concrete Shear Walls,” The 11th Canadian Conference on Earthquake Engineering, Canadian Association for Earthquake Engineering (11CCEE), Victoria, BC, Canada, 8 pp.
Munoz, W.; Salenikovich, A.; Mohammad, M.; and Quenneville, P., 2008, “Determination of Yield Point and Ductility of Timber Assemblies: in Search for a Harmonised Approach,” Proceedings of Meeting 41 of CIB-W18, St. Andrews, NB, Canada.
Park, R., 1989, “Evaluation of Ductility of Structures and Structural Assemblages from Laboratory Testing,” Bulletin of the New Zealand National Society of Earthquake Engineering, V. 2, No. 3, pp. 155-166.
Paulay, T., and Priestley, M. J. N., 1995, Seismic Design of Reinforced Concrete and Masonry Buildings, John Wiley and Sons, New York, 735 pp.
Saatcioglu, M.; Palermo, D.; Ghobarah, A.; Mitchell, D.; Simpson, R.; Adebar, P.; Tremblay, R.; Ventura, C.; and Hong, H., 2013, “Performance of Reinforced Concrete Buildings during the 27 February 2010 Maule (Chile) Earthquake,” Canadian Journal of Civil Engineering, V. 40, No. 8, pp. 693-710. doi: 10.1139/cjce-2012-0243
Sharbatdar, M. K., and Saatcioglu, M., 2009, “Seismic Design of FRP Reinforced Concrete Structures,” Asian Journal of Applied Sciences, V. 2, No. 3, pp. 211-222. doi: 10.3923/ajaps.2009.211.222
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.
Wallace, J. W., and Moehle, J. P., 1992, “Ductility and Detailing Requirements of Bearing Wall Buildings,” Journal of Structural Engineering, ASCE, V. 118, No. 6, pp. 1625-1644. doi: 10.1061/(ASCE)0733-9445(1992)118:6(1625)