Behavior of Concrete-Graphite/Epoxy Sections in Composite Bridge Girders

by F. Gordaninejad, Univ of Nevada, Reno, United States,
M. Saiidi, Univ of Nevada, Reno, United States,
N. Wehbe, Univ of Nevada, Reno, United States,

Abstract: The focus of this work is on the behavior of composite bridge girders constructed from carbon-fiber-reinforced-plastic sections and concrete slabs. The study examines four-point bending in two beams, one a bare, I-type, graphite/epoxy beam, and the other a composite constructed from concrete slab and graphite/epoxy section. Both beams are approximately one-sixth scale models of bridge girders. The sections are geometrically symmetric and have the same symmetric lamination schemes. Theoretical and experimental studies are performed on the bare I-sections to develop basic understanding of the bending behavior. The analyses and tests are then extended to the composite girder. The theoretical and experimental results for the failure loads are in close agreement. It is found that, although the slip at the interface of the concrete and graphite/epoxy has a trivial effect on the failure load, it significantly reduces the stiffness of the composite section.

Subject Headings: Girder bridges | Composite bridges | Plate girders | Minerals | Concrete bridges | Failure loads | Bridge components | Composite structures

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