Effectiveness of Composites in Earthquake Damage Repair of Reinforced Concrete Flared Columns
Publication: Journal of Composites for Construction
Volume 8, Issue 4
Abstract
A method to utilize fiber composites for rapid repair of earthquake damaged flared columns was developed. Two 0.4-scale reinforced concrete columns that had been tested to failure in previous research were used. Both columns had been subjected to slow cyclic loads and had failed due to low-cycle fatigue of the longitudinal bars. To repair the columns, the damaged concrete in and around the plastic hinge was removed and the steel bars were straightened. Low-shrinkage, high-strength concrete grout was placed in the column afterward. The broken longitudinal bars were not replaced. Rather, glass and carbon fiber reinforced polymer (FRP) sheets with fibers running in the axial direction of the column were added to provide flexural strength to the columns. Additionally, glass FRP sheets with horizontal fibers were attached on the column to provide confinement and shear strength. Cyclic tests of the repaired columns indicated that the method to restore the strength was effective. Analysis using conventional constitutive relationships led to a close estimate of the lateral load response of the models.
Get full access to this article
View all available purchase options and get full access to this article.
References
American Association of State Highway and Transportation Officials (AASHTO). (1998). “AASHTO LRFD bridge design specifications.” American Assoc. of State Highway and Transportation Officials, 1st Ed., AASHTO, Washington, D.C.
American Concrete Institute (ACI) Committee 318. (1999). “Building code requirements for structural concrete.” ACI 318-99, Farmington Hills, Mich.
California Department of Transportation (Caltrans). (1999). “Seismic design criteria.” California Dept. of Transportation, Sacramento, Calif.
Chai, Y. H., Priestley, M. J. N., and Seible, F.(1991). “Seismic retrofit of circular bridge columns for enhanced flexural performance.” ACI Struct. J., 88(5), 572–584.
Cheng, Z. (2000). “Rapid repair of earthquake damaged reinforced concrete columns using fiber reinforced plastics.” MSCE thesis, Univ. of Nevada, Reno, Nev.
French, C. W., Thorp, G. A., and Tsai, W. J.(1990). “Epoxy repair techniques for moderate earthquake damage.” ACI Struct. J., 87(4), 416–424.
Park, R., and Paulay, T. (1975). Reinforced concrete structures, Wiley Interscience, New York.
Paulay, T., and Priestley, M. J. N. (1992). Seismic design of reinforced concrete and masonry buildings, Wiley Interscience, New York.
Pulido, C., Saiidi, M., Sanders, D., and Itani, A. (2002). “Seismic performance and retrofitting of reinforced concrete bridge bents.” Rep. No. CCEER 02-1, Civil Engineering Dept., Univ. of Nevada, Reno, Nev.
Saiidi, M., Sanders, D., Gordaninejad, F., Martinovic, F., and McElhaney, B. (2000). “Seismic retrofit of nonprismatic bridge columns with fibrous composites.” Proc., 12th World Conf. on Earthquake Engineering, New Zealand Earthquake Commission.
Saiidi, M., Wehbe, N., Sanders, D., and Caywood, C.(2001). “Shear retrofit of flared RC bridge columns subjected to earthquakes.” J. Bridge Eng., 6(3), 189–197.
Stoppenhagen, D. R., Jirsa, J. O., and Wyllie, Jr., L. A.(1995). “Seismic repair and strengthening of a severely damaged concrete frame.” ACI Struct. J., 92(2), 177–187.
Wehbe, N., and Saiidi, M. (1999). “User’s manual for RCMC v 1.2—A computer program for moment–curvature analysis of confined and unconfined reinforced concrete sections.” Rep. No. CCEER-99-6, Civil Engineering Dept., Univ. of Nevada, Reno, Nev.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 8 • Issue 4 • August 2004
Pages: 306 - 314
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Jul 16, 2002
Accepted: May 14, 2003
Published online: Jul 15, 2004
Published in print: Aug 2004
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.