Alternative materials for FDOT sign structures : phase I literature review.
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2012-05-01
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Edition:Draft final report; Jan.-May 2012.
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Abstract:Inspections of tubular sign structures by the Florida Department of Transportation (FDOT) have
revealed occurrences of premature corrosion on the inside of galvanized steel tubes. As a result, FDOT
engineers are seeking alternative materials that may be employed in such structures. Researchers at the
University of North Florida (UNF) have conducted a literature review of the state-of-the-practice of
employing fiber-reinforced polymer (FRP) composites in such applications. The results of this literature
review indicate that FRP composites have promising material characteristics for such applications. FRP
composites do not corrode and possess significantly lower densities, which may result in lower
construction costs, and extended service life. It is noted however that there will be a short-term
premium associated with the implementation of new technology, as compared with the use of traditional
construction materials. Further, it is noted that FRP composites tend to fail in a more brittle manner,
whereas traditional construction materials are assumed to exhibit greater ductility prior to failure.
Consequently, the need for proven design standards, and specifically connection details, will be critical
for widespread implementation. Based on this literature review, it is recommended that FDOT engage
in a pilot project to test and evaluate the merits of using FRP composites for sign truss structures in
Florida. It is proposed that different commercially available products and different design details,
specifically connections be evaluated as part of the proposed further study.
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