Strengthening Two-Way Reinforced Concrete Floor Slabs Using Polypropylene Fiber Reinforcement
This article has a reply.
VIEW THE REPLYThis article has a reply.
VIEW THE REPLYPublication: Journal of Materials in Civil Engineering
Volume 23, Issue 5
Abstract
Two methods for strengthening two-way reinforced concrete floor slabs subjected to out-of-plane bending loads are compared through experiments on seven test specimens and subsequent analyses. The seven test specimens were two unstrengthened regular reinforced concrete slabs (control), two slabs strengthened using glass-fiber-reinforced polymer (GFRP) sheets, and three slabs strengthened with an innovative method of applying a layer of fiber-reinforced cement (FRC) in varying thicknesses to the tension face of the slab. All specimens were () and were designed to resist bending in both directions. The advantages and disadvantages of the two strengthening methods are discussed in terms of structural considerations, e.g., increase in load carrying capacity and ductility, and construction considerations, e.g., economy and ease of application. Experimental results show a significant increase in the ultimate load capacity of all five strengthened slabs over the two control slabs. The FRC-strengthened slabs exhibit superior ductility and larger measured displacements than the GFRP-strengthened slab. The two methods are comparable in terms of ease of application but FRC is more cost-effective. Theoretical values, which are calculated using existing analytical methods, such as strain compatibility, yield-line analysis, and, as appropriate, flexural shear stress analysis, are generally in good agreement with experimental data. Furthermore, by modifying similar analytical methods for fiber-reinforced polymers (FRPs) found in the literature an analytical method is derived for FRC. The methodologies utilized here provide a means for analysis and design of such rehabilitation schemes. As a result of this study, it is concluded that FRC has great potential as a strengthening method, and future work is recommended to further optimize the proposed strengthening technique.
Get full access to this article
View all available purchase options and get full access to this article.
References
Al-Salloum, Y., and Almusallam, T. (2005). “Load capacity of concrete masonry block walls strengthened with epoxy-bonded GFRP sheets.” J. Compos. Mater., 39(19), 1719–1745.
American Concrete Institute (ACI). (2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-02, Farmington Hills, MI.
ASTM International. (2005). “Standard test method for compressive strength of cylindrical concrete specimens.” C39/C39M-05, West Conshohocken, PA.
ASTM International. (2002). “Standard test method for compressive strength of hydraulic cement mortars (using 2 in. or [50 mm] cube specimens).” C109/C109M-02, West Conshohocken, PA.
ASTM International. (2004). “Standard test method for splitting tensile strength of cylindrical concrete specimens.” C496/C496M-04, West Conshohocken, PA.
Balaguru, P., and Foden, A. (1996). “Properties of fiber-reinforced structural lightweight concrete.” ACI Struct. J., 93(1), 62–78.
Ebead, U., and Marzouk, H. (2004). “Fiber-reinforced polymer strengthening of two-way slabs.” ACI Struct. J., 101(5), 650–659.
Neale, K. W. (2000). “FRPs for structural rehabilitation: a survey of recent progress.” Prog. Struct. Eng. Mater., 2(2), 133–138.
Newman, A. (2001). Structural renovation of Buildings—Methods, details, and design examples, McGraw Hill, New York.
Nilson, A. (1997). Design of concrete structures, 12th Ed., McGraw Hill, New York.
Rankin, G. I. B., and Long, A. E. (1987). “Predicting the punching shear strength of conventional slab-column specimens.” Proc., Part 1: Design and Construction, Institution of Civil Engineers, 82(4), 327–346.
Razl, I. (1985). “Fiber-reinforced mortars in the resurfacing of concrete.” Concr. Int., 7(3), 41–44.
Triantafillou, T. C. (1998). “Strengthening of structures with advanced FRPs.” Prog. Struct. Eng. Mater., 1(2), 126–134.
Information & Authors
Information
Published In
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Dec 2, 2008
Accepted: Oct 8, 2010
Published online: Oct 26, 2010
Published in print: May 1, 2011
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.