GFRP Shear Reinforcement for Slab-Column Edge Connections Subjected to Reversed Cyclic Lateral Load
Publication: Journal of Composites for Construction
Volume 24, Issue 2
Abstract
In regions of high seismic activity, flat plate systems can be used as gravity force resisting systems, where special moment frames are provided as seismic force resisting systems. Nevertheless, all elements of the reinforced concrete (RC) structure must have sufficient deformability to be capable of deforming into the inelastic range. An efficient method of enhancing the deformability of flat plate systems is providing slab shear reinforcement. This paper presents the results of an experimental program evaluating the efficiency of two new types of glass fiber-reinforced polymer (GFRP) shear reinforcement in enhancing the deformability of GFRP-RC slab-column edge connections. Three full-scale connections were tested under gravity and uniaxial reversed-cyclic lateral loading, one connection was reinforced with GFRP shear studs, one with GFRP corrugated bars, and one had no shear reinforcement. The use of GFRP shear studs and corrugated bars increased the lateral load capacity of the connections by 47% and 44%, respectively. In addition, both types of GFRP shear reinforcement were able to enhance the deformability of the connections significantly, whereas the connection with shear studs was able to sustain deformations associated with 3.50% drift ratio without jeopardizing its gravity load capacity.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The authors wish to express their sincere gratitude for the financial support received from the Natural Sciences and Engineering Council of Canada (NSERC) and the Manitoba Graduate Scholarship (MGS). The GFRP shear reinforcement generously provided by Pultrall Inc. are greatly appreciated. The assistance received from the technical staff of the W. R. McQuade Structures Laboratory at the University of Manitoba is acknowledged.
References
ACI (American Concrete Institute). 2005. Acceptance criteria for moment frames based on structural testing and commentary. ACI 374.1. Farmington Hills, MI: ACI.
ACI (American Concrete Institute). 2010. Guide to seismic design of punching shear reinforcement in flat plates. ACI 421.2R. Farmington Hills, MI: ACI.
ACI (American Concrete Institute). 2014. Building code requirements for structural concrete and commentary. ACI 318. Farmington Hills, MI: ACI.
Anggadjaja, E., and S. Teng. 2008. “Edge-column slab connections under gravity and lateral loading.” ACI Struct. J. 105 (5): 541–551.
ASCE-ACI Task Committee 426. 1974. “The shear strength of reinforced concrete members—Slabs.” J. Struct. Div. 100 (8): 1543–1590.
ASTM. 2014. Standard test method for strength of fiber reinforced polymer (FRP) bent bars in bend locations. ASTM D7914/D7914M. West Conshohocken, PA: ASTM.
ASTM. 2016. Standard test method for tensile properties of fiber reinforced polymer matrix composite bars. ASTM D7205/D7205M. West Conshohocken, PA: ASTM.
Carpenter, J., P. Kaar, and W. Corley. 1973. “Design of ductile flat plate structures to resist earthquakes.” In Proc., 5th World Conf. on Earthquake Engineering. Rome: International Association for Earthquake Engineering.
CSA (Canadian Standards Association). 2014a. Concrete materials and methods of concrete construction/test methods and standard practices for concrete. CAN/CSA A23.1/A23.2. Toronto: CSA.
CSA (Canadian Standards Association). 2014b. Design of concrete structures. CAN/CSA A23.3. Toronto, ON: CSA.
CSA (Canadian Standards Association). 2015. Specification for fibre-reinforced polymers. CAN/CSA S807. Toronto: CSA.
CSA (Canadian Standards Association). 2017. Design and construction of building structures with fibre-reinforced polymer. CSA S806 (R2017). Toronto: CSA.
Durrani, A., Y. Du, and Y. Luo. 1995. “Seismic resistance of nonductile slab-column connections in existing flat-slab buildings.” ACI Struct. J. 92 (4): 479–487.
El-Gendy, M., and E. El-Salakawy. 2016. “Effect of shear studs and high moments on punching behavior of GFRP-RC slab–column edge connections.” J. Compos. Constr. 20 (4): 04016007. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000668.
El-Gendy, M., and E. El-Salakawy. 2018a. “Lateral displacement deformability of GFRP-RC slab-column edge connections.” ACI Spec. Publ. 327 (Nov): 52.1–52.20.
El-Gendy, M., and E. El-Salakawy. 2018b. “Punching shear behavior of GFRP-RC slab-column edge connections.” ACI Spec. Publ. 322 (Jun): 5.1–5.20.
Hawkins, N., D. Mitchell, and S. Hanna. 1975. “The effects of shear reinforcement on the reversed cyclic loading behavior of flat plate structures.” Can. J. Civ. Eng. 2 (4): 572–582. https://doi.org/10.1139/l75-052.
Hussein, A., and E. El-Salakawy. 2018. “Punching shear behavior of glass fiber-reinforced polymer–reinforced concrete slab-column interior connections.” ACI Struct. J. 115 (4): 1075–1088. https://doi.org/10.14359/51702134.
Marzouk, H., M. Osman, and A. Hussein. 2001. “Cyclic loading of high-strength lightweight concrete slabs.” ACI Struct. J. 98 (2): 207–214.
Matzke, E., R. Lequesne, G. Parra-Montesinos, and C. Shield. 2015. “Behavior of bi-axially loaded slab-column connections with shear studs.” ACI Struct. J. 112 (3): 335–346. https://doi.org/10.14359/51687408.
Megally, S., and A. Ghali. 1994. “Design considerations for slab-column connections in seismic zones.” ACI Struct. J. 91 (3): 303–314.
Megally, S., and A. Ghali. 2000. “Seismic behavior of slab-column connections.” Can. J. Civ. Eng. 27 (1): 84–100. https://doi.org/10.1139/l99-052.
Mitchell, D., R. Tinawi, and R. Redwood. 1990. “Damage to buildings due to the 1989 Loma Prieta earthquake—A Canadian code perspective.” Can. J. Civ. Eng. 17 (5): 813–834. https://doi.org/10.1139/l90-093.
Mostafa, A., and E. El-Salakawy. 2018. “Behavior of GFRP-RC slab-column edge connections with high-strength concrete and shear reinforcement.” J. Compos. Constr. 22 (2): 04018001. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000831.
Pan, A., and J. Moehle. 1989. “Lateral displacement ductility of reinforced concrete flat plates.” ACI Struct. J. 86 (3): 250–258.
Robertson, I., and A. Durrani. 1991. “Gravity load effect on seismic behavior of exterior slab-column connections.” ACI Struct. J. 88 (3): 255–267.
Robertson, I., T. Kawai, J. Lee, and B. Enomoto. 2002. “Cyclic testing of slab-column connections with shear reinforcement.” ACI Struct. J. 99 (5): 605–613.
Sozen, M. 1980. “Review of earthquake response of R.C. buildings with a view to drift control.” In Proc., 7th World Conf. on Earthquake Engineering, 119–174. Rome: International Association for Earthquake Engineering.
Wey, E., and A. Durrani. 1992. “Seismic response of interior slab-column connections with shear capitals.” ACI Struct. J. 89 (6): 682–691.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 24 • Issue 2 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Feb 27, 2019
Accepted: Aug 14, 2019
Published online: Jan 14, 2020
Published in print: Apr 1, 2020
Discussion open until: Jun 14, 2020
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.