United States Department of Transportation
i
Numerical Analysis of ABC Hybrid Bridge Bents Constructed with Hybrid Reinforcement
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2024-06-01
[PDF-11.53 MB]
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Edition:Final Report
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Abstract:A numerical model simulating the seismic behavior of precast concrete columns confined with glass fiber reinforced polymer (GFRP) spirals and longitudinally reinforced with steel or a combination of steel and GFRP bars was developed using the Open System for Earthquake Engineering Simulation (OpenSees). Four column specimens were tested: two columns with steel and GFRP longitudinal bars (hybrid), and two columns with only steel longitudinal bars (all-steel). All four columns had a double layer of GFRP spiral confinement. One hybrid and one all-steel column were post-tensioned with high-strength steel bars, and carbon fiber-reinforced plastic (CFRP) jackets were applied at the column base for confinement. The columns were connected to footings using grouted duct connections and tested under cyclic loads. A computational modeling strategy is presented to analyze the column-footing connections with steel and FRP composites. The numerical model showed satisfactory agreement with experiments in terms of hysteresis curves, drift ratio at bar fracture, cumulative hysteretic energy (less than 6.0% deviation up to bar fracture), and post-tensioning force prediction (less than 5.0% difference).
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