CFRP Repair and Strengthening of Structurally Deficient Piles: Design Issues and Field Application
Publication: Journal of Composites for Construction
Volume 10, Issue 1
Abstract
The application of carbon fiber reinforced polymers (CFRP) for the repair and strengthening of corrosion-damaged elements is relatively recent. Although several demonstration studies have been completed, no formal design method is available. This paper presents analyses developed for the repair and rehabilitation of four square prestressed piles exposed to an aggressive marine environment. The analysis considers both loss in strength and corrosion-induced expansion. Strength restoration is obtained from interaction relations using a strain compatibility analysis. The longitudinal fibers of the bidirectional FRP layer configuration were designed to restore the strength; whereas, the transverse fibers were verified that they provide the necessary confinement to withstand expansive strains caused by corrosion. Three models proposed by Caltrans, ISIS, and the writers are compared. The Caltrans model is found to be the most conservative. The ISIS and the writers’ model gave similar results. A field demonstration was carried out in which segments of four prestressed piles located in the splash zone supporting the Allen Creek Bridge in Clearwater, Fla., were wrapped. Two of these piles are instrumented for continuous monitoring of their corrosion performance.
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Acknowledgments
This study was performed in cooperation with and funding from the State of Florida Department of Transportation. This support is gratefully acknowledged. The assistance and guidance of Mr. Jose Garcia and Mr. Steve Womble from the FDOT is greatly acknowledged. The writers thank Dr. Gray Mullins, Dr. Rajan Sen, Mr. Danny Winters, Mr. Mike Stokes, Mr. Kadir Uslu, and Mr. K. S. Suh from the University of South Florida for their contribution. The opinions, findings and conclusions expressed in this publication are those of the writers and not necessarily those of the State of Florida Department of Transportation.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 10 • Issue 1 • February 2006
Pages: 26 - 34
Copyright
© 2006 ASCE.
History
Received: Feb 3, 2005
Accepted: May 4, 2005
Published online: Feb 1, 2006
Published in print: Feb 2006
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