External Prestressing Concrete Columns for Improved Seismic Shear Resistance
Publication: Journal of Structural Engineering
Volume 129, Issue 8
Abstract
Lateral prestressing of concrete columns was investigated as a method of seismic retrofit. Experimental research was conducted to develop a design procedure for shear deficient concrete columns. The technology consists of external prestressing of columns in transverse direction by means of individual hoops that consist of prestressing strands and specially designed anchors. Seven full-scale columns were tested under constant axial compression and incrementally increasing lateral deformation reversals. The results, presented and discussed in this paper, indicate that the retrofit methodology can suppress shear failure, promote flexural behavior, and increase inelastic column deformability substantially. A design procedure is presented for seismic retrofit of shear-deficient columns to achieve two different levels of performance.
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References
American Concrete Institute (ACI) Committee 318. (2002). “Building code requirements for reinforced concrete (ACI318-02) and Commentary (318R-02).” American Concrete Institute, Farmington Hills, Mich., 443.
Budek, A. M., Lee, C. O., and Priestley, M. J. N. (2001). “Seismic design of circular bridge columns with unstressed prestressing strand for transverse reinforcement.” Research Rep. No. SSRP-2001/16, Dept. of Structural Engineering, Univ. of California at San Diego, San Diego.
Federal Highway Administration. (1995). FHWA seismic retrofitting manual, Federal Highway Administration, U.S. Dept. of Transportation, Washington, D.C.
Gamble, W. L., Hawkins, N. M., and Kaspar, I. I. (1996). “Seismic ret-rofitting experience and experiments in Illinois.” Proc., 5th National Workshop on Bridge Research in Progress, National Center for Earthquake Engineering Research (NCEER), State Univ. of New York at Buffalo, Buffalo, New York, 245–250.
Saatcioglu, M., Yalcin, C., Mes, D., and Beausejour, P. (2000). “Seismicretrofitting concrete columns by external prestressing.” OCEERC Research Rep., Ottawa-Carleton Earthquake Engineering Research Centre, Univ. of Ottawa, Ottawa.
Yalcin, C. (1997). “Seismic evaluation and retrofit of existing reinforced concrete bridge columns.” PhD dissertation, Dept. of Civil Engineering, Univ. of Ottawa, Ottawa, 316.
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Information
Published In
Journal of Structural Engineering
Volume 129 • Issue 8 • August 2003
Pages: 1057 - 1070
Copyright
Copyright © 2003 American Society of Civil Engineers.
History
Received: Mar 14, 2001
Accepted: Sep 27, 2002
Published online: Jul 15, 2003
Published in print: Aug 2003
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