Limits of Application of Externally Bonded CFRP Repairs for Impact-Damaged Prestressed Concrete Girders
Publication: Journal of Composites for Construction
Volume 18, Issue 3
Abstract
Collisions between overheight vehicles and bridges are becoming more commonplace. Generally, collision damage is far from catastrophic, although sound repair techniques are critical if additional damage (typically related to corrosion) is to be mitigated. Although the decision to repair or replace a collision-damaged prestressed concrete structure must ultimately be made on a case-by-case basis, basic criteria for making this decision may be established. This paper describes parameters affecting the efficacy of external carbon fiber-reinforced polymer (CFRP) composite repair methods for restoring the flexural capacity of damaged prestressed concrete bridge girders. The study focuses on impact damage requiring structural repair (rather than simply aesthetic measures). The physical limitations of each CFRP repair method are described to define an initial design space, followed by a parametric study using two prestressed girder shapes (box and I-girder) and three CFRP repair techniques (externally bonded, prestressed, and near-surface mounted) in which the goal was to identify the design space of each technique. The effective design space for each method is then described by the spectra of damage to which the method may be effectively applied. The spectra of damage may be envisioned as having two thresholds: the no repair—repair threshold and the repair—replace threshold.
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Acknowledgments
The work reported in this paper was conducted for the American Association of Highway and Transportation Officials (AASHTO) with funding provided through the National Cooperative Highway Research Program (NCHRP) Project 20-07, Task 307: Updated Research for Collision Damage and Repair of Prestressed Concrete Beams. The work was guided by a technical working group. The project was managed by Dr. Waseem Dekelbab, NCHRP Senior Program Officer, whose support is greatly appreciated. The opinions expressed are those of the authors.
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© 2013 American Society of Civil Engineers.
History
Received: Jul 26, 2012
Accepted: Nov 15, 2012
Published online: Nov 19, 2012
Discussion open until: May 27, 2014
Published in print: Jun 1, 2014
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