Abstract
The effectiveness of glass/carbon fibre reinforced polymer (GFRP/CFRP) wraps at plastic hinges has been confirmed; however, their respective effectiveness on reducing seismic damage of deficient reinforced concrete structures has hardly been compared. The current study aims at this comparison, providing some useful information to realise the better FRP for confinement retrofitting of reinforced concrete structures poorly confined due to deficient transverse reinforcement. Four- and eight-storey poorly confined reinforced concrete frames were selected to represent low- and mid-rise building structures, respectively. These deficient frames were then strengthened by CFRP/GFRP wraps via external confinement. Inelastic time history and cumulative damage analyses of the original, CFRP- and GFRP-retrofitted frames were performed. The damages of CFRP- and GFRP-retrofitted frames were compared with each other and with the damage of the original frame. The comparison results show that CFRP and GFRP wraps at plastic hinges substantially reduce damage. More importantly, GFRP wraps are more effective than CFRP wraps by reducing a higher amount of the cumulative damage index. The conclusions can help in deciding on the type of FRP to be used for confinement retrofitting of RC structures poorly confined due to deficient transverse reinforcement.
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References
Sheikh SA, Li Y (2007) Design of FRP confinement for square concrete columns. Eng Struct 29:1074–1083. https://doi.org/10.1016/j.engstruct.2006.07.016
Lam L, Teng JG (2003) Design-oriented stress–strain model for FRP-confined concrete. Constr Build Mater 17:471–489. https://doi.org/10.1016/S0950-0618(03)00045-X
Wei Y-Y, Wu Y-F (2012) Unified stress–strain model of concrete for FRP-confined columns. Constr Build Mater 26:381–392. https://doi.org/10.1016/j.conbuildmat.2011.06.037
Pellegrino C, Modena C (2010) Analytical model for FRP confinement of concrete columns with and without internal steel reinforcement. J Compos Constr 14(6):693–705. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000127
Smith ST, Kim SJ, Zhang H (2010) Behavior and effectiveness of FRP wrap in the confinement of large concrete cylinders. J Compos Constr 14(5):573–582. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000119
Abd El Fattah A (2018) New axial stress–strain model of square concrete columns confined with lateral steel and FRP. Compos Struct 202:731–751. https://doi.org/10.1016/j.compstruct.2018.03.085
Harajli MH, Rteil AA (2004) Effect of confinement using fiber-reinforced polymer or fiber-reinforced concrete on seismic performance of gravity load-designed columns. ACI Struct J 101(1):47–56
Sheikh SA, Yau G (2002) Seismic behavior of concrete columns confined with steel and fiber-reinforced polymers. ACI Struct J 99(1):72–80
Rahai A, Akbarpour H (2014) Experimental investigation on rectangular RC columns strengthened with CFRP composites under axial load and biaxial bending. Compos Struct 108(Supplement C):538–546. https://doi.org/10.1016/j.compstruct.2013.09.015
Zeng JJ, Lin G, Teng JG, Li LJ (2018) Behavior of large-scale FRP-confined rectangular RC columns under axial compression. Eng Struct 174:629–645. https://doi.org/10.1016/j.engstruct.2018.07.086
Cao Y-G, Jiang C, Wu Y-F (2016) Cross-sectional unification on the stress-strain model of concrete subjected to high passive confinement by fiber-reinforced polymer. Polymers 8(5):186–202. https://doi.org/10.3390/polym8050186
Lam L, Teng JG (2003) Design-oriented stress–strain model for FRP-confined concrete in rectangular columns. J Reinf Plast Compos 22(13):1149–1186. https://doi.org/10.1177/0731684403035429
Balsamo A, Colombo A, Manfredi G, Negro P, Prota A (2005) Seismic behavior of a full-scale RC frame repaired using CFRP laminates. Eng Struct 27:769–780. https://doi.org/10.1016/j.engstruct.2005.01.002
Ludovico MD, Prota A, Manfredi G, Cosenza E (2008) Seismic strengthening of an under-designed RC structure with FRP. Earthq Eng Struct Dyn 37:141–162. https://doi.org/10.1002/eqe.749
Ludovico MD, Manfredi G, Mola E, Negro P, Prota A (2008) Seismic behavior of a full-scale RC structure retrofitted using GFRP laminates. J Struct Eng 134(5):810–821. https://doi.org/10.1061/(ASCE)0733-9445(2008)134:5(810)
Garcia R, Hajirasouliha I, Pilakoutas K (2010) Seismic behaviour of deficient RC frames strengthened with CFRP composites. Eng Struct 32:3075–3085. https://doi.org/10.1016/j.engstruct.2010.05.026
Mortezaei A, Ronagh HR, Kheyroddin A (2010) Seismic evaluation of FRP strengthened RC buildings subjected to near-fault ground motions having fling step. Compos Struct 92:1200–1211. https://doi.org/10.1016/j.compstruct.2009.10.017
Eslami A, Ronagh HR (2013) Effect of FRP wrapping in seismic performance of RC buildings with and without special detailing—a case study. Compos B Eng 45(1):1265–1274. https://doi.org/10.1016/j.compositesb.2012.09.031
Cao VV, Ronagh HR (2014) Reducing the seismic damage of reinforced concrete frames using FRP confinement. Compos Struct 118:403–415. https://doi.org/10.1016/j.compstruct.2014.07.038
Ronagh HR, Eslami A (2013) On flexural retrofitting of RC buildings using GFRP/CFRP—a comparative study. Compos Part B 46:188–196. https://doi.org/10.1016/j.compositesb.2012.09.072
ASCE (2000) Prestandard and commentary for the seismic rehabilitation of buildings. Prepared for Federal Emergency Management Agency, FEMA publication no. 356. Federal Emergency Management Agency, Washington, D.C
ICBO (1994) Uniform building code. International Conference of Building Officials, Whittier
ACI (2008) Building code requirements for structural concrete (ACI 318M-08) and commentary. American Concrete Institute, Farmington Hills
Wang L-M, Wu Y-F (2008) Effect of corner radius on the performance of CFRP-confined square concrete columns: test. Eng Struct 30:493–505. https://doi.org/10.1016/j.engstruct.2007.04.016
Luca AD, Nardone F, Matta F, Nanni A, Lignola GP, Prota A (2011) Structural evaluation of full-scale FRP-confined reinforced concrete columns. J Compos Constr 15(1):112–123. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000152
Takeda T, Sozen MA, Nielsen NN (1970) Reinforced concrete response to simulated earthquakes. J Struct Div 96:2557–2573
Sheikh SA, Khoury SS (1993) Confined concrete columns with stubs. ACI Struct J 90(4):414–431
Paulay T, Priestley MJN (eds) (1992) Seismic design of reinforced concrete and masonry buildings. Wiley, New York
Park R, Priestley MJN, Gill WD (1982) Ductility of square-confined concrete columns. J Struct Div 108:929–950
Harajli MH, Hantouche E, Soudki K (2006) Stress-strain model for fiber-reinforced polymer jacketed concrete columns. ACI Struct J 103(5):672–682
Wu G, Wu ZS, Lü ZT (2007) Design-oriented stress–strain model for concrete prisms confined with FRP composites. Constr Build Mater 21(5):1107–1121. https://doi.org/10.1016/j.conbuildmat.2005.12.014
Youssef MN, Feng MQ, Mosallam AS (2007) Stress–strain model for concrete confined by FRP composites. Compos B Eng 38(5–6):614–628. https://doi.org/10.1016/j.compositesb.2006.07.020
Eid R, Paultre P (2017) Compressive behavior of FRP-confined reinforced concrete columns. Eng Struct 132:518–530. https://doi.org/10.1016/j.engstruct.2016.11.052
Campione G, Cannella F, Ferrotto MF, Gianquinto M (2018) Compressive behavior of FRP externally wrapped R.C. column with buckling effects of longitudinal bars. Eng Struct 168:809–818. https://doi.org/10.1016/j.engstruct.2018.05.027
Rocca S, Galati N, Nanni A (2009) Interaction diagram methodology for design of FRP-confined reinforced concrete columns. Constr Build Mater 23(4):1508–1520. https://doi.org/10.1016/j.conbuildmat.2008.06.010
Realfonzo R, Napoli A (2013) Confining concrete members with FRP systems: predictive vs design strain models. Compos Struct 104:304–319. https://doi.org/10.1016/j.compstruct.2013.04.031
Baji H, Ronagh HR, Li CQ (2016) Probabilistic design models for ultimate strength and strain of FRP-confined concrete. J Compos Constr 20(6):04016051. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000704
Baji H (2017) Calibration of the FRP resistance reduction factor for FRP-confined reinforced concrete building columns. J Compos Constr 21(3):04016107. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000769
Chaudat T, Garnier C, Cvejic S, Poupin S, Le Corre M, Mahe M (2005) ECOLEADER project no. 2: seismic tests on a reinforced concrete bare frame with FRP retrofitting-tests report. SEMT/EMSI/RT/05-006/A. CEA, Saclay, (France)
Computers and Structures Inc (2017) SAP2000 version 19.2.0
PEER (2011) PEER ground motion database. http://peer.berkeley.edu/peer_ground_motion_database. Accessed 2018
ASCE (2010) Minimum design loads for buildings and other structures. ASCE/SEI 7-10. American Society of Civil Engineers
Cao VV, Ronagh H, Ashraf M, Baji H (2014) A new damage index for reinforced concrete structures. Earthq Struct 6(6):581–609. https://doi.org/10.12989/eas.2014.6.6.581
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This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant number 107.02-2017.18.
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Van Cao, V., Pham, S.Q. Comparison of CFRP and GFRP Wraps on Reducing Seismic Damage of Deficient Reinforced Concrete Structures. Int J Civ Eng 17, 1667–1681 (2019). https://doi.org/10.1007/s40999-019-00429-y
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DOI: https://doi.org/10.1007/s40999-019-00429-y