Exploratory Study of Seismic Response of Deficient Lap-Splice Columns Retrofitted with Near Surface–Mounted Basalt FRP Bars
Publication: Journal of Structural Engineering
Volume 142, Issue 6
Abstract
This paper presents a near surface–mounted (NSM) retrofit technique to enhance the seismic performance of existing reinforced-concrete (RC) columns with lap-splice deficiencies using basalt fiber-reinforced polymer (BFRP) reinforcing bars. The bond condition between the BFRP bars and the surrounding materials was examined using bars with smooth and rough textures. Three columns were designed with poor detail in the longitudinal lap splices and improper transverse confinement; one sample served as a reference, and the others were strengthened with NSM BFRP bars and an external BFRP jacket around the plastic hinge zone. The test results were assessed in terms of the seismic performance of a well-designed column (i.e., a column with continuous longitudinal reinforcement and well-designed stirrups). The test results indicated that the texture of the FRP bars is a key retrofit design parameter that can be used to control the inelastic performance of lap-splice columns. FRP bars with a rough texture ensured a gradual increase in column strength after yielding and mitigated residual displacement. Furthermore, the original functions of retrofitted columns could be rapidly restored after an earthquake with a drift of up to 4.5%, whereas the postearthquake recoverability of a well-designed column cannot be guaranteed after a drift of 2% is reached.
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References
AASHTO LRFD Bridge Design Specifications. (2013). “American association of state highway and 406 transportation officials.” Washington, DC, 1716.
ACI (American Concrete Institute). (2006). “Guide for the design and construction of concrete reinforced with FRP bars.” ACI 440.1 R-06, Detroit, MI.
ACI (American Concrete Institute). (2008). “Guides for the design and construction of externally bonded FRP system for strengthening concrete structures.” ACI 440.2R-08, Farmington Hills, MI.
Barros, J. A., and Fortes, A. S. (2005). “Flexural strengthening of concrete beams with CFRP laminates bonded into slits.” Cem. Concr. Compos., 27(4), 471–480.
Barros, J. A. O., Ferreira, D. R. S. M., Fortes, A. S., and Dias, S. J. E. (2006). “Assessing the effectiveness of embedding CFRP laminates in the near surface for structural strengthening.” Constr. Build. Mater., 20(7), 478–491.
Barros, J. A. O., and Kotynia, R. (2008). “Possibilities and challenges of NSM for the flexural strengthening of RC structures.” Proc., 4th Int. Conf. on FRP Composites in Civil Engineering (CICE2008), International Institute for FRP Construction (IIFC).
Bonaldo, E., Barros, J. A. O., and Lourenço, P. B. (2008). “Efficient strengthening technique to increase the flexural resistance of existing RC slabs.” J. Compos. Constr., 149–159.
Bournas, D. A., and Triantafillou, T. C. (2008). “Experimental investigation of flexurally strengthened RC columns with near surface mounted FRP or stainless steel reinforcement.” Proc., Challenges for Civil Construction Int. Conf. (CCC2008) (CD-ROM), FEUP Edições, Porto, Portugal.
Bournas, D. A., and Triantafillou, T. C. (2009). “Flexural strengthening of reinforced concrete columns with near-surface-mounted FRP or stainless steel.” ACI Struct. J., 106(4), 495–505.
Brena, S. F., and Schlick, B. M. (2007). “Hysteretic behavior of bridge columns with FRP-jacketed lap splices designed for moderate ductility enhancement.” J. Compos. Constr., 565–574.
Canadian Standards Association (CAN/CSA). (2006). “Canadian highway bridge design code.”, Mississauga, ON, Canada.
Chang, K. C., and Chang, S. P. (2004). “Seismic retrofit study of rectangular RC columns lap spliced at plastic hinge zone.”, Proc., Joint NSC/NRC Workshop on Construction, National Center for Research on Earthquake Engineering, Taipei, Taiwan, 27–34.
Christopoulos, C., and Pampanin, S. (2004). “Towards performance-based seismic design of MDOF structures with explicit consideration of residual deformations.” ISET J. Earthquake Technol., 41(1), 53–73.
De Lorenzis, L., and Teng, J. G. (2007). “Near-surface mounted FRP reinforcement: An emerging technique for strengthening structures.” Compos. Part B: Eng., 38(2), 119–143.
ElGawady, M., Endeshaw, M., McLean, D., and Sack, R. (2010). “Retrofitting of rectangular columns with deficient lap splices.” J. Compos. Constr., 22–35.
Elmenshawi, A., and Brown, T. (2010). “Hysteretic energy and damping capacity of flexural elements constructed with different concrete strengths.” Eng. Struct., 32(1), 297–305.
Elsanadedy, H. M. (2002). “Seismic performance and analysis of ductile composite-jacketed reinforced concrete bridge columns.” Ph.D. thesis, Univ. of California at Irvine, Irvine, CA.
Fahmy, M. F. M. (2010). “Enhancing recoverability and controllability of reinforced concrete bridge frame columns using FRP composites.” Ph.D. thesis, Ibaraki Univ., Ibaraki, Japan.
Fahmy, M. F. M., Wu, Z. S., and Wu, G. (2009). “Seismic performance assessment of damage-controlled FRP-retrofitted RC bridge columns using residual deformations.” J. Compos. Constr., 498–513.
Fahmy, M. F. M., Wu, Z. S., and Wu, G. (2010). “Post-earthquake recoverability of existing RC bridge piers retrofitted with FRP composites.” Constr. Build. Mater., 24(6), 980–998.
Ghosh, K. K., and Sheikh, S. A. (2007). “Seismic upgrade with carbon fiber reinforced polymer of columns containing lap-spliced reinforcing bars.” ACI Struct. J., 104(2), 227–236.
Harajli, M. H. (2009). “Bond strengthening of lap spliced reinforcement using external FRP jackets: An effective technique for seismic retrofit of rectangular or circular RC columns.” Constr. Build. Mater., 23(3), 1265–1278.
Harajli, M. H., and Dagher, F. (2008). “Seismic strengthening of bond-critical regions in rectangular columns using fiber reinforced polymer wraps.” ACI Struct. J., 105(1), 68–76.
Haroun, M. A., and Elsanadedy, H. M. (2005). “Fiber-reinforced plastic jackets for ductility enhancement of reinforced concrete bridge columns with poor lap-splice detailing.” J. Bridge Eng., 749–757.
Harries, K. A., Ricles, J. R., Pessiki, S., and Sause, R. (2006). “Seismic retrofit of lap splices in nonductile square columns using carbon fiber-reinforced jackets.” ACI Struct. J., 103(6), 226–236.
Hassan, T. K., and Rizkalla, S. H. (2003). “Investigation of bond in concrete structures strengthened with near surface mounted carbon fiber reinforced polymer strips.” J. Compos. Constr., 248–257.
Hassan, T. K., and Rizkalla, S. H. (2004). “Bond mechanism of near-surface-mounted fiber-reinforced polymer bars for flexural strengthening of concrete structures.” ACI Struct. J., 101(6), 830–839.
JSCE Earthquake Engineering Committee. (2000). “Earthquake resistant design codes in Japan.” Tokyo, 150.
Kawashima, K. (2000). “Seismic design and retrofit of bridges.” Bull. N. Z. Soc. Earthquake Eng., 33(3), 265–285.
Kotynia, R. (2005). “Strengthening of reinforced concrete structures with near surface mounted FRP reinforcement.” Proc., 5th Int. Conf. Analytical Models and New Concepts in Concrete and Masonry Structures AMCM 2005, Wydział Budownictwa Politechniki Śląskiej, Gliwice.
Lee, D., Cheng, L., and Yan-Gee Hui, J. (2013). “Bond characteristics of various NSM FRP reinforcements in concrete.” J. Compos. Constr., 117–129.
Mazzoni, S., et al. (2009). “Open System for Earthquake Engineering Simulation user manual version 2.1.0.” Pacific Earthquake Engineering Center, Univ. of California, Berkeley, CA.
Menegotto, M., and Pinto, P. E. (1973). “Method of analysis for cyclically loaded reinforced concrete plane frames including changes in geometry and nonelastic behavior of elements under combined normal force and bending.” Proc., IABSE Symp. on Resistance and Ultimate Deformability of Structures Acted on by Well-Defined Repeated Loads, International Association for Bridge and Structural Engineering, Zurich, Switzerland, 112–123.
Park, R., and Paulay, T. (1975). Reinforced concrete structures, Wiley, New York, 769.
Perrone, M., Barros, J. A. O., and Aprile, A. (2009). “CFRP-based strengthening technique to increase the flexural and energy dissipation capacities of RC columns.” J. Compos. Constr., 372–383.
Scott, B. D., Park, R., and Priestley, M. J. N. (1982). “Stress-strain behavior of concrete confined by overlapping hoops at low and high strain rates.” ACI Struct. J., 79(1), 13–27.
Seible, F., Priestley, M. J. N., Hegemier, G. A., and Innamorato, D. (1997). “Seismic retrofit of RC columns with continuous carbon fiber jackets.” J. Compos. Constr., 52–62.
Sim, J., Park, C., and Moon, D. Y. (2005). “Characteristics of basalt fiber as a strengthening material for concrete structures.” Compos. Part B: Eng., 36(6), 504–512.
Xiao, Y., and Ma, R. (1997). “Seismic retrofit of RC circular columns using prefabricated composite jacketing.” J. Struct. Eng., 1357–1364.
Zhao, J., and Sritharan, S. (2007). “Modeling of strain penetration effects in fiber-based analysis of reinforced concrete structures.” ACI Struct. J., 104(2), 133–141.
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Information
Published In
Journal of Structural Engineering
Volume 142 • Issue 6 • June 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Dec 31, 2014
Accepted: Oct 28, 2015
Published online: Jan 25, 2016
Published in print: Jun 1, 2016
Discussion open until: Jun 25, 2016
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