Title:
Nonlinear Backbone Modeling of Concrete Columns Retrofitted with Fiber-Reinforced Polymer or Steel Jackets
Author(s):
José C. Alvarez, Sergio F. Breña, and Sanjay R. Arwade
Publication:
Structural Journal
Volume:
115
Issue:
1
Appears on pages(s):
53-64
Keywords:
backbone curves; column retrofitting; jacketed columns; nonlinear modeling parameters
DOI:
10.14359/51700779
Date:
1/1/2018
Abstract:
The use of nonlinear analysis procedures in seismic retrofitting of existing concrete structures has become commonplace in practice. Backbone curves are often used to capture the nonlinear response of components in a simplified but sufficiently accurate way. Procedures to construct curves for existing components of frames (beams, joints, and columns) have received considerable attention and have been modified over the years. In contrast, recommendations to construct these backbone curves for retrofitted components are largely lacking. This paper presents recommendations that can be used to construct backbone curves of circular and rectangular retrofitted columns using jacketing materials within the context of ASCE/SEI 41-13 and ACI 369R-11. The recommendations are developed using a sectional model for force parameters and a statistical study of load-deformation results from a database of retrofitted columns for drift parameters when sufficient experimental data are available. Key points in the backbone response of jacketed columns are summarized in tabular form consistent with ASCE/SEI 41-13 to facilitate possible adoption in future updates of the standard. A probabilistic model is introduced to allow selection of drift values that correspond to selected exceedance probabilities.
Related References:
Aboutaha, R. S.; Engelhardt, M. D.; Jirsa, J. O.; and Kreger, M. E., 1996, “Retrofit of Concrete Columns with Inadequate Lap Splices by the Use of Rectangular Steel Jackets,” Earthquake Spectra, V. 12, No. 4, pp. 693-714. doi: 10.1193/1.1585906
Aboutaha, R. S.; Engelhardt, M. D.; Jirsa, J. O.; and Kreger, M. E., 1999a, “Rehabilitation of Shear Critical Concrete Columns by Use of Rectangular Steel Jackets,” ACI Structural Journal, V. 96, No. 1, Jan.-Feb., pp. 68-78.
Aboutaha, R. S.; Engelhardt, M. D.; Jirsa, J. O.; and Kreger, M. E., 1999b, “Experimental Investigation of Seismic Repair of Lap Splice Failures in Damaged Concrete Columns,” ACI Structural Journal, V. 96, No. 2, Mar.-Apr., pp. 297-307.
ACI Committee 369, 2011, “Guide for Seismic Rehabilitation of Existing Concrete Frame Buildings (ACI 369R-11),” American Concrete Institute, Farmington Hills, MI, 35 pp.
Alcocer, S. M., and Durán-Hernández, R., 2002, “Seismic Performance of a RC Building with Columns Rehabilitated with Steel Angles and Straps. Innovations in Design with Emphasis on Seismic, Wind, and Environmental Loading,” Quality Control and Innovations in Materials/Hot Weather Concreting, pp. 531-552.
Alvarez, J. C., and Breña, S. F., 2014, “Non-Linear Modeling Parameters for Jacketed Columns Used in Seismic Rehabilitation of RC Buildings,” Seismic Assessment of Reinforced Concrete Buildings, SP-297, K. J. Elwood, J. Dragovich, and I. Kim, eds., American Concrete Institute, Farmington Hills, MI. (CD-ROM)
ASCE/SEI 41-13, 2013, “Seismic Rehabilitation of Existing Buildings,” American Society of Civil Engineers, Reston, VA.
Breña, S. F., and Schlick, B. M., 2007, “Hysteretic Behavior of Bridge Columns with FRP-Jacketed Lap Splices Designed for Moderate Ductility Enhancement,” Journal of Composites for Construction, ASCE, V. 11, No. 6, pp. 565-574. doi: 10.1061/(ASCE)1090-0268(2007)11:6(565)
Chai, Y. H.; Nigel Priestley, M. J. N.; and Seible, F., 1991, “Seismic Retrofit of Circular Bridge Columns for Enhanced Flexural Performance,” ACI Structural Journal, V. 88, No. 5, Sept.-Oct., pp. 572-584.
Cho, J.-Y., and Pincheira, J. A., 2006, “Inelastic Analysis of Reinforced Concrete Columns with Short Lap Splices Subjected to Reversed Cyclic Loads,” ACI Structural Journal, V. 103, No. 2, Mar.-Apr., pp. 280-290.
Galal, K.; Arafa, A.; and Ghobarah, A., 2005, “Retrofit of RC Square Short Columns,” Engineering Structures, V. 27, No. 5, pp. 801-813. doi: 10.1016/j.engstruct.2005.01.003
Ghosh, K. K., and Sheikh, S. A., 2007, “Seismic Upgrade With Carbon Fiber-Reinforced Polymer of Columns Containing Lap-Spliced Reinforcing Bars,” ACI Structural Journal, V. 104, No. 2, Mar.-Apr., pp. 227-236.
Harajli, M. H., and Dagher, F., 2008, “Seismic Strengthening of Bond-Critical Regions in Rectangular Reinforced Concrete Columns Using Fiber-Reinforced Polymer Wraps,” ACI Structural Journal, V. 105, No. 1, Jan.-Feb., pp. 68-77.
Harajli, M. H., and Rteil, A. A., 2004, “Effect of Confinement Using Fiber-Reinforced Polymer or Fiber-Reinforced Concrete on Seismic Performance of Gravity Load-Designed Columns,” ACI Structural Journal, V. 101, No. 1, Jan.-Feb., pp. 47-56.
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 Structural Journal, V. 103, No. 6, Nov.-Dec., pp. 708-716.
Haroun, M. A., and Elsanadedy, H. M., 2005a, “Fiber-Reinforced Plastic Jackets for Ductility Enhancement of Reinforced Concrete Bridge Columns with Poor Lap-Splice Detailing,” Journal of Bridge Engineering, ASCE, V. 10, No. 6, pp. 749-757. doi: 10.1061/(ASCE)1084-0702(2005)10:6(749)
Haroun, M. A., and Elsanadedy, H. M., 2005b, “Behavior of Cyclically Loaded Squat Reinforced Concrete Bridge Columns Upgraded with Advanced Composite-Material Jackets,” Journal of Bridge Engineering, ASCE, V. 10, No. 6, pp. 741-748. doi: 10.1061/(ASCE)1084-0702(2005)10:6(741)
Iacobucci, R. D.; Sheikh, S. A.; and Bayrak, O., 2003, “Retrofit of Square Concrete Columns with Carbon Fiber-Reinforced Polymer for Seismic Resistance,” ACI Structural Journal, V. 100, No. 6, Nov.-Dec., pp. 785-794.
Lam, L., and Teng, J., 2003a, “Design-Oriented Stress-Strain Model for FRP-Confined Concrete,” Construction and Building Materials, V. 17, No. 6-7, pp. 471-489. doi: 10.1016/S0950-0618(03)00045-X
Lam, L., and Teng, J., 2003b, “Design-Oriented Stress-Strain Model for FRP-Confined Concrete in Rectangular Columns,” Journal of Reinforced Plastics and Composites, V. 22, No. 13, pp. 1149-1186. doi: 10.1177/0731684403035429
Li, Y.-F.; Hwang, J.-S.; Chen, S.-H.; and Hsieh, Y.-M., 2005, “A Study of Reinforced Concrete Bridge Columns Retrofitted by Steel Jackets,” Zhongguo Gongcheng Xuekan, V. 28, No. 2, pp. 319-328. doi: 10.1080/02533839.2005.9670997
Mander, J. B.; Priestley, M. J. N.; and Park, R., 1988, “Theoretical Stress-Strain Model for Confined Concrete,” Journal of Structural Engineering, ASCE, V. 114, No. 8, pp. 1804-1826. doi: 10.1061/(ASCE)0733-9445(1988)114:8(1804)
Memon, M. S., and Sheikh, S. A., 2005, “Seismic Resistance of Square Concrete Columns Retrofitted with Glass Fiber-Reinforced Polymer,” ACI Structural Journal, V. 102, No. 5, Sept.-Oct., pp. 774-783.
Ozcan, O.; Binici, B.; and Ozcebe, G., 2010, “Seismic Strengthening of Rectangular Reinforced Concrete Columns Using Fiber Reinforced Polymers,” Engineering Structures, V. 32, No. 4, pp. 964-973. doi: 10.1016/j.engstruct.2009.12.021
Priestley, M. J. N.; Seible, F.; Xiao, Y.; and Verma, R., 1994a, “Steel Jacket Retrofitting of Reinforced Concrete Bridge Columns for Enhanced Shear Strength—Part 1: Theoretical Considerations and Test Design,” ACI Structural Journal, V. 91, No. 4, July-Aug. pp. 394-405.
Priestley, M. J. N.; Seible, F.; Xiao, Y.; and Verma, R., 1994b, “Steel Jacket Retrofitting of Reinforced Concrete Bridge Columns for Enhanced Shear Strength Part 2: Test Results and Comparison with Theory,” ACI Structural Journal, V. 91, No. 5, Sept.-Oct., pp. 537-551.
Seible, F.; Priestley, M. J. N.; Hegemier, G. A.; and Innamorato, D., 1997, “Seismic Retrofit of RC Columns with Continuous Carbon Fiber Jackets,” Journal of Composites for Construction, ASCE, V. 1, No. 2, pp. 52-62. doi: 10.1061/(ASCE)1090-0268(1997)1:2(52)
Wu, Y.-F.; Wang, L.; and Liu, T., 2008, “Experimental Investigation on Seismic Retrofitting of Square RC Columns by Carbon FRP Sheet Confinement Combined with Transverse Short Glass FRP Bars in Bored Holes,” Journal of Composites for Construction, ASCE, V. 12, No. 1, pp. 53-60. doi: 10.1061/(ASCE)1090-0268(2008)12:1(53)
Xiao, Y., and Ma, R., 1997, “Seismic Retrofit of RC Circular Columns Using Prefabricated Composite Jacketing,” Journal of Structural Engineering, ASCE, V. 123, No. 10, pp. 1357-1364. doi: 10.1061/(ASCE)0733-9445(1997)123:10(1357)
Xiao, Y., and Wu, H., 2003, “Retrofit of Reinforced Concrete Columns Using Partially Stiffened Steel Jackets,” Journal of Structural Engineering, ASCE, V. 129, No. 6, pp. 725-732. doi: 10.1061/(ASCE)0733-9445(2003)129:6(725)