Title:
Evaluation of Flexural and Shear Stiffness of Concrete Squat Walls Reinforced with Glass Fiber-Reinforced Polymer Bars
Author(s):
Ahmed Arafa, Ahmed Sabry Farghaly, and Brahim Benmokrane
Publication:
Structural Journal
Volume:
115
Issue:
1
Appears on pages(s):
211-221
Keywords:
concrete squat walls; flexural and shear deformations; glass fiber-reinforced polymer bars; seismic resistance; stiffness
DOI:
10.14359/51700987
Date:
1/1/2018
Abstract:
Estimating the flexural and shear stiffness of concrete squat walls reinforced with glass fiber-reinforced polymer (GFRP) bars is important to evaluate lateral displacement. To address this issue, five full-scale concrete squat walls, including four reinforced with GFRP bars and one reinforced with steel bars, were tested to failure under quasi-static reversed cyclic lateral loading. Decoupling flexural and shear deformations of the tested specimens showed the contribution of shear deformation to the lateral displacement. The shear stiffness of the cracked wall can be estimated based on the truss model with an acceptable level of conservatism. The shearcrack angle and concrete shear strength were evaluated. The flexural stiffness was estimated based on available expressions in codes and guidelines related to the design of concrete members reinforced with fiber-reinforced polymer bars, demonstrating their adequacy with walls although they were established for beam and slab elements. Based on regression analyses of the test results, expressions that correlate flexural and shear stiffness to lateral drift were proposed. Such expressions would be vital in the context of displacement-based design.
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, 519 pp.
ACI Committee 440, 2015, “Guide for the Design and Construction of Concrete Reinforced with FRP Bars (ACI 440.1R-15),” American Concrete Institute, Farmington Hills, MI, 44 pp.
Arafa, A.; Farghaly, A. S.; and Benmokrane, B., 2016, “Experimental Investigation of GFRP-Reinforced Squat Wall Subjected to Lateral Load,” 7th International Conference on Advanced Composite Materials in Bridges and Structures (ACMBS-VII), Vancouver, BC, Canada, 10 pp.
ASCE/SEI 43, 2005, “Seismic Design Criteria for Structures, Systems, and Components in Nuclear Facilities (ASCE/SEI 43-05),” American Society of Civil Engineers, Reston, VA.
CSA A23.3-14, 2014, “Design of Concrete Structures Standard,” Canadian Standards Association, Mississauga, ON, Canada, 240 pp.
CSA S6-14, 2014, “Canadian Highway Bridge Design Code,” Canadian Standards Association, Mississauga, ON, Canada, 732 pp.
CSA S806-12, 2012, “Design and Construction of Building Components with Fiber-Reinforced Polymers,” Canadian Standards Association, Mississauga, ON, Canada, 208 pp.
Eurocode 8, 2004, “Design of Structures for Earthquake Resistance, Part 1: General Rules, Seismic Actions and Rules for Buildings, ENV 1998-1:2003,” Comité Européen de Normalisation, Brussels, Belgium.
Hiraishi, H., 1984, “Evaluation of Shear and Flexural Deformations of Flexural Type Shear Walls,” Bulletin of the New Zealand National Society for Earthquake Engineering, V. 17, No. 2, pp. 135-144.
Li, B., and Xiang, W., 2011, “Effective Stiffness of Squat Structural Walls,” Journal of Structural Engineering, ASCE, V. 137, No. 12, pp. 1470-1479. doi: 10.1061/(ASCE)ST.1943-541X.0000386
Luna, B. N.; Rivera, J. P.; and Whittaker, A. S., 2015, “Seismic Behavior of Low-Aspect-Ratio Reinforced Concrete Shear Walls,” ACI Structural Journal, V. 112, No. 5, Sept.-Oct., pp. 593-604. doi: 10.14359/51687709
Massone, L. M.; Orakcal, K.; and Wallace, J. W., 2009, “Modeling of Squat Structural Walls Controlled by Shear,” ACI Structural Journal, V. 106, No. 5, Sept.-Oct., pp. 646-655.
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.
Mohamed, N.; Farghaly, A. S.; Benmokrane, B.; and Neale, K. W., 2014b, “Flexure and Shear Deformation of GFRP-Reinforced Shear Walls,” Journal of Composites for Construction, ASCE, V. 18, No. 2.
NBCC, 2010, “National Building Code of Canada,” Canadian Commission on Building and Fire Codes, National Research Council of Canada, Montreal, QC, Canada
NZS 3101, 1995, “Code of Practice for the Design of Concrete Structures, Part 1,” Standards New Zealand, Wellington, New Zealand.
Oesterle, R. G.; Aristizabal-Ochoa, J. D.; Fiorato, A. E.; Russell, H. G.; and Corley, W. G., 1979, “Earthquake Resistant Structural Walls—Test of Isolated Walls—Phase II.” Report ENV77-15333, National Science Foundation, Arlington, VA.
Park, R., and Paulay, T., 1975, Reinforced Concrete Structures, John Wiley & Sons, Inc., New York.
Paulay, T.; Priestley, M. J. N.; and Synge, A. J., 1982, “Ductility in Earthquake Resisting Squat Shear Walls,” ACI Journal Proceedings, V. 79, No. 4, Apr., pp. 257-269.
Salonikios, T. N.; Kappos, A. J.; Tegos, I. A.; and Penelis, G. G., 1999, “Cyclic Load Behavior of Low-Slenderness Reinforced Concrete Walls: Design Basis and Test Results,” ACI Structural Journal, V. 96, No. 4, July-Aug., pp. 649-660.
Tang, T. O., and Su, R. K. L., 2014, “Shear and Flexural Stiffnesses of Reinforced Concrete Shear Walls Subjected to Cyclic Loading,” The Open Construction and Building Technology Journal, V. 8, pp. 104-121. doi: 10.2174/1874836801408010104