Title:
Assessment of Shear Strength Design Models for Fiber-Reinforced Concrete Deep Beams Reinforced with Steel or FRP Bars
Author(s):
Ahmed G. Bediwy and Ehab F. El-Salakawy
Publication:
Symposium Paper
Volume:
356
Issue:
Appears on pages(s):
170-190
Keywords:
empirical models, database, FRP, FRC, shear strength, deep beams
DOI:
10.14359/51737270
Date:
10/1/2022
Abstract:
Deep beams are common elements in concrete structures such as bridges, water tanks, and parking garages, which are usually exposed to harsh environments. To mitigate corrosion-induced damage in these structures, steel reinforcement is replaced by fiber-reinforced polymers (FRPs). Several attempts have been made during the last decade to introduce empirical models to estimate the shear strength of FRP-reinforced concrete (RC) deep beams. In this study, the applicability of these models to predict the capacity of simply supported deep beams with and without web reinforcement was assessed. Test results of 54 FRP-RC, 24 steel-fiber-reinforced concrete (FRC), and 7 FRP-FRC deep beams were used to evaluate the available models. In addition, a proposed model to predict the shear strength of FRPFRC deep beams was introduced. The model was calibrated against experiments conducted previously by the authors on FRP-FRC deep beams under gravity load. The model could predict the ultimate capacity with a mean experimental-to-predicted value of 1.04 and a standard deviation of 0.14.
Related References:
AASHTO (2014), “AASHTO LRFD bridge design specifications.” 7th Edition, American Association of State Highway and Transportation Officials, (AASHTO), Washington.
ACI Committee 318. (2019). “Building code requirements for structural concrete (ACI 318-19) and commentary (ACI 318R-19).” American Concrete Institute, Detroit, MI, 1-519.
ACI Committee 440. (2015). “Guide for the design and construction of structural concrete reinforced with FRP bars.” ACI 440.1R-15, American Concrete Institute, Detroit, MI, 1-88.
ACI-ASCE Committee 445. (1998). “Recent approaches to shear design of structural concrete.” Journal of Structural Engineering, ASCE, 124 (12): 1375-1417.
Adebar, P., Mindess, S., Pierre, D. S., and Olund, B. (1997). “Shear tests of fiber concrete beams without stirrups.” ACI
Structural Journal, 94(1): 68-76.
Andermatt, M. F., Lubell A. S. (2013). "Behavior of concrete deep beams reinforced with internal Fiber-Reinforced Polymer—experimental Study." ACI Structural Journal, 110 (4): 585-594.
Ashour, S. A., Hasanain, G. S., and Wafa, F. F. (1992). “Shear behavior of high-strength fiber reinforced concrete beams.” ACI Structural Journal, 89(2): 176-184.
Bediwy, A. and El-Salakawy, E.F. (2021). “Ductility and Performance Assessment of Basalt Fiber-Reinforced Cementitious Composite Layered Deep Beams.” ACI Structural Journal, 118(4): 83-95.
Bediwy, A. Mahmoud, K., and El-Salakawy, E.F. (2021). “Structural Behavior of FRCC Layered Deep Beams Reinforced with GFRP Headed-End Bars.” Engineering Structures, 243, 112648, 12 p.
Bentur, A., and Mindess, S. (2007). "Fiber reinforced cementitious composites." 2nd Ed., E and FN Spon, New York.
Campione, G. (2012). “Flexural behavior of steel fibrous reinforced concrete deep beams.” Journal of Structural Engineering, 138(2): 235-246.
CSA. (2017). “Design and construction of building structures with fibre-reinforced polymer.” CSA S806-12 (R2017). Canadian Standard Association (CSA), Toronto, ON, Canada.
CSA. (2019a). “Design of concrete structures.” CSA A23.3-19, Canadian Standards Association (CSA), Toronto, ON, 1-290.
CSA. (2019b). "Canadian highway bridge design code and commentary." CSA S6-19, Canadian Standards Association (CSA), Rexdale, ON, Canada.
Dhahir, M. K. (2017). “Shear strength of FRP reinforced deep beams without web reinforcement.” Composite Structures, 165: 223-232.
EN 1992-1-1:2004. (2004). “Eurocode 2: design of concrete structures part 1-1: general rules and rules for buildings.” British Standards Institution, London.
Fang, I. K., and Wu, J. Y. (1994). “Shear behavior of fiber-reinforced HPC deep beams.” ACI Special Publication, 149: 523-544.
Farghaly, A. S., and Benmokrane, B. (2013). “Shear behavior of FRP-reinforced concrete deep beams without web reinforcement.” ASCE, Journal of Composites for Construction, 17(6): 04013015.
Jaeger G. L., Tadros G., and Mufti A. A. (1995). “Balanced section, ductility, and deformability in concrete with FRP reinforcement.” Research report no. 2-1995. Halifax (NS, Canada): Industry Center for Computer-Aided Engineering, Technical University of Nova Scotia.
Japan Society of Civil Engineering. (1997). “Recommendation for design and construction of concrete structures using continuous fibre reinforcing materials.” Concrete Engineering Series 23, Tokyo, Japan, 325.
Japan Society of Civil Engineering. (2007). “Standard specifications for concrete structures.” Tokyo, Japan, 469.
Ma, K., Qi, T., Liu, H., and Wang, H. (2018). “Shear behavior of hybrid fiber reinforced concrete deep beams.” Materials, 11(10), 2023.
Kim, D. J., Lee, J., and Lee, Y. H. (2014). “Effectiveness factor of strut-and-tie model for concrete deep beams reinforced with FRP rebars.” Composites Part B: Engineering, 56: 117-125.
Mansur, M. A., and Ong, K. C. G. (1991). “Behavior of reinforced fiber concrete deep beams in shear.” Structural Journal, 88(1): 98-105.
Mohamed, A. M., Mahmoud, K., and El-Salakawy, E. F. (2020). “Behavior of simply supported and continuous concrete deep beams reinforced with GFRP bars.” ASCE, Journal of Composites for Construction, 24(4): 04020032.
Mohamed, K., Farghaly, A.S. and Benmokrane, B. (2017). “Effect of vertical and horizontal web reinforcement on the strength and deformation of concrete deep beams reinforced with GFRP bars.” ASCE, Journal of Structural Engineering, 143 (8): 04017079.
Moradi, M. and Esfahani, M. R. (2017). “Application of the strut-and-tie method for steel fiber reinforced concrete deep
beams.” Construction and Building Materials, 131: 423-437.
Naaman A. E. and Jeong S. M. (1995). “Structural ductility of concrete beams prestressed with FRP tendons.” In: Proceedings, 2nd int. RILEM symp. FRPRXS-2. Non-metric (FRP) reinforcement for concrete structures. RILEM, London: E and FN Spon, 379–86.
Nehdi, M., Omeman, Z., and El-Chabib, H. (2008). “Optimal efficiency factor in strut-and-tie model for FRP-reinforced
concrete short beams with (1.5< a/d< 2.5).” Materials and structures, 41(10): 1713-1727.
Sagaseta J. (2008). “The influence of aggregate fracture on the shear strength of reinforced concrete beams.” Imperial
Collage London; 2008. PhD thesis.
Sahoo, D. R., Flores, C. A., and Chao, S. H. (2012). “Behavior of steel fiber-reinforced concrete deep beams with large
opening.” ACI Structural Journal, 109(2): 193–203.
Shahnewaz, M., and Alam, M. S. (2014). “Improved shear equations for steel fiber-reinforced concrete deep and slender
beams.” ACI Structural Journal, 111(4): 551-860.
Tuchscherer, R. G., and Quesada, A. (2015). “Replacement of deformed side-face steel reinforcement in deep beams with
steel fibers.” Structures, 3: 130-136.
Vecchio FJ, Collins MP. (1986) “The modified compression-field theory for reinforced concrete elements subjected to
shear.” ACI Structural Journal, 83(2): 219–31.
Wight, J. K. and MacGregor, J. G. (2009). “Reinforced concrete: mechanics and design.” 6th edition, Pearson Prentice
Hall, Upper Saddle River, New Jersey: 1-1157.
Zsutty, T. C. (1968). “Beam shear strength prediction by analysis of existing data.” ACI Journal Proceedings, 65(11):
943-951.