United States Department of Transportation
i
Durable Bridges Using Glass Fiber Reinforced Polymer and Hybrid Reinforced Concrete Columns
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2023-12-01
[PDF-3.99 MB]
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Edition:Final Report
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Abstract:Fiber reinforced polymer (FRP) composite materials have been studied and applied to reinforced concrete (RC) structures for strengthening or seismic retrofit for many years. This research is related to using FRP composites in new bridge structures. Capacity degradation in RC components of existing bridges occurs in harsh weather conditions when corroded steel reinforcement expands, which causes subsequent strength losses in concrete through the development of cracking and spalling. After significant earthquake events, RC structures undergo substantial residual displacement, which may cause instability and prevent the continued use of these structures. Accelerated bridge construction (ABC) has widespread construction applications with a new connection approach using semi-rigid corrugated steel ducts filled with ultra high-performance grout (UHPG). Based on these critical demands and developments, this report focuses on three main areas: (a) a hybrid longitudinal reinforcement system using conventional steel and glass fiber reinforced polymer (GFRP) longitudinal bars and GFRP spirals to resist corrosion and provide partial self-centering; (b) a post-tensioning system using all threaded, hot rolled, high-strength prestressing steel for self-centering capability; and (c) UHPG duct connections for ABC using one or both elements defined previously, i.e., hybrid reinforcement and post-tensioning. Four half-scale newly constructed columns with footing systems were tested under quasi-static cyclic loads simulating seismic effects. Experimental studies are conducted to facilitate the design and implementation of grouted duct connections with four types of columns: (1) all-steel longitudinal bars with GFRP spirals; (2) hybrid reinforcement in the form of longitudinal steel/GFRP bars with GFRP spirals; (3) all-steel longitudinal steel bars with GFRP spirals and post-tensioned high-strength steel rods, and (4) hybrid reinforcement in the form of longitudinal steel/GFRP bars with GFRP spirals and post-tensioned high-strength steel rods.
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