Redevelopment of Prestressing Force in Severed Prestressed Strands
Publication: Journal of Bridge Engineering
Volume 16, Issue 3
Abstract
The flexural capacity rating of prestressed girders having severed or corroded strands often progresses by simply neglecting the contribution of the affected strands from the girder section and assessing the capacity. While this is an adequate approach at the affected section, it is conservative elsewhere along the span, assuming that fully bonded strands are used. Once it reenters sound concrete, the severed or corroded strand continues to be bonded to the concrete; thus stress transfer between the concrete and strand is possible and the strand prestress force may be “redeveloped” (in the sense of transfer length) by bond transfer at a distance from the damage location. This paper reports an experimental study that clearly shows that prestress force is redeveloped at a distance from the location at which a strand is severed. Furthermore, American Association of State Highway and Transportation Officials (AASHTO) and American Concrete Institute (ACI) code-prescribed transfer-length calculations appear to remain valid for this redevelopment behavior.
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Acknowledgments
The writers gratefully acknowledge the Pennsylvania Department of Transportation for allowing the writers continued access to the Lake View Drive girders.
References
American Association of State Highway and Transportation Officials (AASHTO). (2007). LRFD bridge design specifications, 4th Ed. and Interims, Washington, DC.
American Concrete Institute (ACI) Committee 222. (2001). “Corrosion of prestressing steels.” ACI 222.2R-01, ACI, Farmington Hills, MI, 43.
American Concrete Institute (ACI) Committee 318. (2008). “Building code requirements for structural concrete and commentary.” ACI 318-08, ACI, Farmington Hills, MI, 43.
Federal Highway Administration (FHWA). (2007). “National bridge inventory (NBI).” 〈www.fhwa.dot.gov/bridge/nbi.htm〉 (Feb. 12, 2010).
Harries, K. A. (2006). “Full-scale testing program on de-commissioned girders from the Lake View Drive bridge.” Rep. FHWA-PA-2006-008-EMG001, Pennsylvania Department of Transportation, Harrisburg, PA, 158.
Harries, K. A. (2009). “Structural testing of prestressed concrete girders from the Lake View Drive bridge.” J. Bridge Eng., 14(2), 78–92.
Harries, K. A., Kasan, J., and Aktas, C. (2009). “Repair methods for prestressed girder bridges.” Rep. FHWA-PA-2009-008-PIT 006, Pennsylvania Department of Transportation, Harrisburg, PA, 169.
Naito, C., Sause, R., Hodgson, I., Pessiki, S., and Desai, C. (2006). “Forensic evaluation of prestressed box beams from the Lake View Drive over I-70 bridge.” ATLSS Rep. No. 06-13, Lehigh Univ., Bethlehem, PA, 62.
Precast/Prestressed Concrete Institute (PCI). (1999). PCI design handbook, 5th Ed, PCI, Chicago.
Spancrete. (1960). “Washington County L.R. 798-1 bridge at STA. Drawings (3 sheets).” June 28, 1960. Approved by PADoH August 10, 1960.
Tabatabai, H., and Dickson, T. J. (1993). “The history of the prestressing strand development length equation.” PCI J., 38(6), Nov.–Dec. 1993, 64–75.
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Copyright
© 2011 American Society of Civil Engineers.
History
Received: Feb 23, 2010
Accepted: Aug 31, 2010
Published online: Sep 6, 2010
Published in print: May 1, 2011
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