Shear Strength of Reinforced Concrete Columns Retrofitted by Glass Fiber Reinforced Polyurea
Aged structures and structures constructed based on outdated non-seismic design codes should be retrofitted to enhance their strength, ductility, and durability. This study evaluates the structural performance of reinforced concrete (RC) columns enhanced via polyurea or glass fiber reinforced polyurea (GFRPU) strengthening. Four RC column specimens, including a reference specimen (an unstrengthened column), were tested to evaluate the parameters of the strengthening materials and the strengthened area. The tests were carried out under a combined constant axial compressive load and quasi-static cyclic loading. The experimental results show that the composite strengthening provides lateral confinement to the columns and leads to enhanced ductility, shear-resistance capacity, and dissipated energy. The shear strength provided by the composites depends on the degree of lateral confinement achieved by the composite coating. The specimens finally failed through the development of diagonal tension cracks within the potential plastic hinge regions. The specimen treated with GFRPU strengthening showed greater strength and dissipated more energy than the specimen treated with polyurea strengthening. Furthermore, by modifying ATC-40, this study proposed an equation to estimate the shear capacity provided by the composites.
Juntanalikit, Pragasit, Tidarut Jirawattanasomkul, and Amorn Pimanmas. “Experimental and Numerical Study of Strengthening Non-Ductile RC Columns with and Without Lap Splice by Carbon Fiber Reinforced Polymer (CFRP) Jacketing.” Engineering Structures 125 (October 2016): 400–418. doi:10.1016/j.engstruct.2016.07.019.
Lee, Kang, Bang Lee, and Soo Seo. “A Seismic Strengthening Technique for Reinforced Concrete Columns Using Sprayed FRP.” Polymers 8, no. 4 (March 24, 2016): 107. doi:10.3390/polym8040107.
Wang, Daiyu, Le Huang, Tao Yu, and Zhenyu Wang. “Seismic Performance of CFRP-Retrofitted Large-Scale Square RC Columns with High Axial Compression Ratios.” Journal of Composites for Construction 21, no. 5 (October 2017): 04017031. doi:10.1061/(asce)cc.1943-5614.0000813.
Raza, Saim, Muhammad K. I. Khan, Scott J. Menegon, Hing-Ho Tsang, and John L. Wilson. “Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review.” Sustainability 11, no. 11 (June 9, 2019): 3208. doi:10.3390/su11113208.
Del Zoppo, Marta, Marco Di Ludovico, Alberto Balsamo, Andrea Prota, and Gaetano Manfredi. “FRP for Seismic Strengthening of Shear Controlled RC Columns: Experience from Earthquakes and Experimental Analysis.” Composites Part B: Engineering 129 (November 2017): 47–57. doi:10.1016/j.compositesb.2017.07.028.
Seible, Frieder, MJ Nigel Priestley, Gilbert A. Hegemier, and Donato Innamorato. "Seismic retrofit of RC columns with continuous carbon fiber jackets." Journal of composites for construction 1, no. 2 (1997): 52-62. doi:10.1061/(ASCE)1090-0268(1997)1:2(52).
Colomb, F., H. Tobbi, E. Ferrier, and P. Hamelin. “Seismic Retrofit of Reinforced Concrete Short Columns by CFRP Materials.” Composite Structures 82, no. 4 (February 2008): 475–487. doi:10.1016/j.compstruct.2007.01.028.
Capani, Francesco, Angelo D’Ambrisi, Mario De Stefano, Francesco Focacci, Raimondo Luciano, Raffaele Nudo, and Rosa Penna. “Experimental Investigation on Cyclic Response of RC Elements Repaired by CFRP External Reinforcing Systems.” Composites Part B: Engineering 112 (March 2017): 290–299. doi:10.1016/j.compositesb.2016.12.053.
Realfonzo, R., and A. Napoli. “Cyclic Behavior of RC Columns Strengthened by FRP and Steel Devices.” Journal of Structural Engineering 135, no. 10 (October 2009): 1164–1176. doi:10.1061/(asce)st.1943-541x.0000048.
Huang, Hua, Min Huang, Wei Zhang, and Tao Wu. “Seismic Behavior of Strengthened Square Reinforced Concrete Columns Under Combined Loadings.” Structure and Infrastructure Engineering 15, no. 11 (June 6, 2019): 1468–1484. doi:10.1080/15732479.2019.1625415.
Anand, Praveen, and Ajay Kumar Sinha. “Effect of Reinforced Concrete Jacketing on Axial Load Capacity of Reinforced Concrete Column.” Civil Engineering Journal 6, no. 7 (July 1, 2020): 1266–1272. doi:10.28991/cej-2020-03091546.
Noroozieh, Ehsan, and Ali Mansouri. “Lateral Strength and Ductility of Reinforced Concrete Columns Strengthened with NSM FRP Rebars and FRP Jacket.” International Journal of Advanced Structural Engineering 11, no. 2 (May 3, 2019): 195–209. doi:10.1007/s40091-019-0225-5.
Farrokh Ghatte, Hamid, Mustafa Comert, Cem Demir, Mustafa Akbaba, and Alper Ilki. “Seismic Retrofit of Full-Scale Substandard Extended Rectangular RC Columns through CFRP Jacketing: Test Results and Design Recommendations.” Journal of Composites for Construction 23, no. 1 (February 2019): 04018071. doi:10.1061/(asce)cc.1943-5614.0000907.
Zhou, Chunli, Xiaowei Li, Dongbo Wang, and Shunxiang Xia. “Analysis of Bearing Capacity and Seismic Performance of Circular RC Columns Strengthened with Externally Wrapped Steel Plates.” Advances in Civil Engineering 2019 (August 26, 2019): 1–17. doi:10.1155/2019/2515091.
Greene, Courtney E., and John J. Myers. “Flexural and Shear Behavior of Reinforced Concrete Members Strengthened with a Discrete Fiber-Reinforced Polyurea System.” Journal of Composites for Construction 17, no. 1 (February 2013): 108–116. doi:10.1061/(asce)cc.1943-5614.0000308.
Natalia, L. C., J. M. John, A. Domenico, M. Costantino, and P. Andrea. "Polyurea Coated and Plane Reinforced Concrete Panel Behavior under Blast Loading: Numerical Simulation to Experimental Results. Trends in Civil Engineering and Architecture 1 (4)-2018." TCEIA. MS. ID 119 (2018).
Song, Jun-Hyuk, Eun-Taik Lee, and Hee-Chang Eun. “A Study on the Strengthening Performance of Concrete Beam by Fiber-Reinforced Polyurea (FRPU) Reinforcement.” Advances in Civil Engineering 2020 (March 11, 2020): 1–9. doi:10.1155/2020/6967845.
Song, Jun-Hyeok, Eun-Taik Lee, and Hee-Chang Eun. “A Study on the Improvement of Structural Performance by Glass Fiber-Reinforced Polyurea (GFRPU) Reinforcement.” Advances in Civil Engineering 2019 (August 19, 2019): 1–8. doi:10.1155/2019/2818219.
Carey, N. L., and J. J. Myers. "Discrete fiber reinforced polymer systems for repair of concrete structures: polyurea-fiber characterization results." Special Publication 275 (2011): 285-298.
Amirkhizi, A. V., J. Qiao, K. Schaaf, and S. Nemat-Nasser. "Properties of elastomer-based particulate composites." In Dynamic Behavior of Materials, Volume 1, (2011): 69-72. doi:10.1007/978-1-4419-8228-5_10.
Kinsella, Michael, Dennis Murray, David Crane, John Mancinelli, and Mark Kranjc. "Mechanical properties of polymeric composites reinforced with high strength glass fibers." International SAMPE Technical Conference, vol. 33, (2001):1644-1657.
Velasco, J. I., D. Arencón, M. Sánchez-Soto, A. Gordillo, and M. Ll. Maspoch. “Milled Glass Fiber Filled-Poly(Ethylene Terephthalate-Co-Isophthalate) Composites - Thermal and Mechanical Properties.” Journal of Thermoplastic Composite Materials 16, no. 4 (July 2003): 365–380. doi:10.1177/0892705703016004006.
ATC-40, Seismic evaluation and retrofit of concrete buildings, vol. 1, Applied Technology Council (1996).
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