United States Department of Transportation
i
Behavior and Repair of Corroded Steel H-Piles
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2021-01-01
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[PDF-79.18 MB]
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Edition:Final Report (December 2017-January2021)
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Abstract:This report summarizes the details of experimental work and finite element modeling conducted to evaluate: 1) the remaining axial capacity of H-piles having different corrosion severity and extension levels, and 2) the performance of repaired corroded H-piles. Seventeen full-scale H-piles were investigated under concentric and eccentric loads. The piles had milled cross sections to represent the loss of a cross-sectional area due to corrosion. Three different repair solutions were investigated: concrete filled pultruded fiber reinforced polymer tubes (CFPTs), ultra-high-performance concrete (UHPC) plates, and concrete jackets encased in fiber reinforced polymer. Push-out of thirty-eight specimens was carried out to optimize the three repair techniques. This was followed by repairing nine full-scale H-piles using the three different methods. Furthermore, finite element and analytical models were developed for the virgin and repaired specimens. Corrosion changed the mode of failure of the investigated piles from global buckling to local buckling which triggered global buckling. The AISC (P-Δ) analytical approach was the best approach to predict the strengths of the corroded piles. Both the UHPC plates and concrete encased in FRP jackets repair solutions were able to recover the strength of the corroded piles. The UHPC, however, represented a fast solution for repair. Concrete filled pultruded FRP tubes repair was not able to recover the strength of the virgin piles.
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