Hysteretic Behavior of Bridge Columns with FRP-Jacketed Lap Splices Designed for Moderate Ductility Enhancement
Publication: Journal of Composites for Construction
Volume 11, Issue 6
Abstract
This paper presents test results of six specimens representing older bridge columns with inadequate reinforcement detailing consisting of short lap splices at the base and widely spaced transverse reinforcement. Four of these specimens were rehabilitated using fiber-reinforced polymer (FRP) jackets of two different composite materials (carbon and aramid) to avoid premature failure of the lapped bars after a limited number of postyield cycles. The test results indicate that thin FRP jackets can be used to avoid failure of short lap splices at moderate displacement ductilities. Displacement capacities consistent with expected demands in regions of moderate or low seismicity were achieved after jacket retrofitting. The hysteretic behavior of rehabilitated columns was assessed with emphasizing issues related to variation of stiffness and damping ratio as a function of ductility demand for this class of columns. Equations that account for the effect of axial load level on estimates of effective stiffness and damping as a function of displacement ductility are proposed for this class of columns.
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Acknowledgments
The writers wish to acknowledge the assistance of Daniel Crovo from the Massachusetts Highway Department for providing typical details of older bridge columns used for this study. In kind material donations received from Mr. Robert Brack (Barker Steel), Dr. Gus Porter (Connecticut Steel), and Mr. Steve Tysl (Degussa) are also gratefully acknowledged. The findings and opinions expressed in this paper are those of the writers and do not constitute endorsement by the sponsors.
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Information
Published In
Journal of Composites for Construction
Volume 11 • Issue 6 • December 2007
Pages: 565 - 574
Copyright
© 2007 ASCE.
History
Received: Feb 10, 2006
Accepted: Sep 29, 2006
Published online: Dec 1, 2007
Published in print: Dec 2007
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