United States Department of Transportation
i
Fiber Reinforced Polymer (FRP) Seismic Retrofit of Reinforced Concrete Bridge Columns Vulnerable to Long-Duration Subduction Zone Earthquakes
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2022-05-01
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[PDF-6.62 MB]
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Abstract:This research was focused on characterization of the behavior of FRP jacketed bridge columns under long-duration earthquakes. Six tests were conducted on cantilever bridge columns with FRP jackets at the base. The FRP jackets were 0.40” and extended over a height of one column diameter. The FRP had specified strength of 128-ksi and elastic modulus of 14.2ksi in the circumferential direction. Test variables for the columns included longitudinal reinforcement ratio, longitudinal bar diameter, axial load ratio, and loading protocol. All tested columns had lateral deformation capacity of at least 6% drift, with lateral deformation capacity considered to occur at 20% strength loss. Axial failure was not achieved in any of the test columns, and the tests were stopped after multiple cycles at 10% drift. Five of the six test columns were nominally identical to a set of previously tested columns with FRP jackets.
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