United States Department of Transportation
i
Numerical Simulation of Strengthening of Bridge Decks Built with Partial Depth Precast Concrete Deck Panels
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2024-07-01
[PDF-5.40 MB]
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Edition:Final Report
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Abstract:In several states, bridge deck delamination of reinforced concrete bridge decks built with partial depth precast concrete panels and cast-in-place concrete has been observed. The partial depth precast concrete panels are typically prestressed. Recently, one such failure was observed in Utah. There is a need to develop strengthening and repair methods to re-laminate the partial depth precast concrete panel and cast-in-place concrete deck, ensure composite behavior through mechanical connections, or strengthen the panel such that bridge deck delamination does not pose a safety risk. The goal of the study was to develop numerical models to predict the response of structurally delaminated concrete decks and the response of strengthened decks. Five retrofit methods were developed to strengthen the deck panels as follows: (1) uni-directional carbon fiber reinforced polymer composite strips bonded to the bottom of the precast section, (2) proprietary mechanical shear anchors connecting the cast-in-place concrete and precast section, (3) high modulus epoxy injection between the cast-in-place and precast sections, (4) nonproprietary shear anchors connecting the cast-in-place and precast sections, and (5) epoxy injection with proprietary shear anchors. Numerical models were developed for three cases to corroborate the laboratory testing: (1) a delaminated deck panel with no retrofit, (2) a nonproprietary shear anchor retrofit, and (3) an epoxy injection retrofit. Similar to laboratory testing, the numerical model concluded that the epoxy injection increases deck panel stiffness, significantly creating a more composite behavior.
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