Retrofitting of Rectangular Columns with Deficient Lap Splices
Publication: Journal of Composites for Construction
Volume 14, Issue 1
Abstract
The cyclic behavior of eight 0.4-scale reinforced concrete column specimens is investigated. The columns incorporated deficient design details to simulate bridge columns built in Washington State prior to 1971. Two columns were tested as reference specimens, five were tested after retrofitting using carbon fiber-reinforced polymer (CFRP), and one was tested after retrofitting using a conventional steel jacket. All the specimens were tested under constant gravity load and incrementally increasing lateral loading cycles. The specimens had rectangular cross sections with aspect ratios of 1.5 and 2.0. The parameters investigated included the amount of CFRP reinforcement, different retrofitting jacket configurations, and different retrofitting materials. For the as-built specimens, two modes of failure occurred, namely low cyclic fatigue of longitudinal reinforcement and lap splice failure. For the retrofitted specimens, no lap splice failure was observed. All the retrofitted specimens failed due to low cyclic fatigue failure of the longitudinal bars. The retrofitting measures improved the displacement ductility, energy dissipation, and equivalent viscous damping. In addition, increasing the amount of CFRP reinforcement improved the performance of the test specimens.
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Acknowledgments
This research was conducted through the Washington State Transportation Research Center (TRAC) with funding from the Federal Highway Administration (FHWA) under Grant No. UNSPECIFIEDDTFH61-03-C-00104. The writers also thank Dr. Ghasemi of FHWA for his continued support as a contract technical monitor. Appreciation is also extended to Mr. R. Duncan, S. Lewis, C. Davis for technical support during construction and testing the specimens.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 14 • Issue 1 • February 2010
Pages: 22 - 35
Copyright
© 2010 ASCE.
History
Received: Jan 8, 2009
Accepted: Apr 19, 2009
Published online: Apr 24, 2009
Published in print: Feb 2010
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