Abstract
A numerical model is presented for a rocking bridge bent specimen consisting of two precast concrete columns with posttensioning (PT) bars, two footings, and a cap beam, with or without a buckling restrained brace (BRB). First, a numerical model of the posttensioned bridge bent specimen without a BRB is developed; emphasis is placed on modeling the rocking mechanism at the joint between precast concrete members joined only through PT bars. The numerical model is extended to a hybrid specimen consisting of a two-column posttensioned bridge bent with a BRB as an external energy dissipation device. Experimental results obtained from quasi-static cyclic tests of the posttensioned and hybrid specimens are compared with the numerical models. Satisfactory agreement of the numerical models with the experimental results is observed in terms of structural response, hysteretic energy, and PT-bar forces. The numerical models are subsequently extended to a previously tested three-column bridge bent for two configurations: (1) a posttensioned bridge bent with PT bars, and (2) a hybrid bridge bent with PT bars and two BRBs. A fiber-based bridge bent model is built, which includes soil–structure interaction (SSI) using simplified springs. A comparison of the posttensioned and hybrid bridge bents using far-field and near-field ground motions shows that the hybrid bridge bent displays superior performance compared with the posttensioned-only bridge bent.
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Acknowledgments
The authors acknowledge the financial support of the Mountain-Plains Consortium through Project MPC-545. The authors thank Corebrace LLC, Forterra Precast Inc., and BASF for their assistance. The authors thank Mark Bryant, Dipen Thapa, Dylan Briggs, Duc Tran, Anurag Upadhyay, and Ruoyang Wu for their support. The authors would like to acknowledge the helpful discussions with Brandt Saxey of Corebrace LLC.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 28 • Issue 2 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Mar 29, 2022
Accepted: Sep 19, 2022
Published online: Dec 6, 2022
Published in print: Feb 1, 2023
Discussion open until: May 6, 2023
ASCE Technical Topics:
- Bents (structural)
- Bracing
- Bridge engineering
- Bridges
- Buckling
- Concrete
- Construction engineering
- Construction methods
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Frames
- Hybrid methods
- Materials engineering
- Materials processing
- Methodology (by type)
- Models (by type)
- Numerical models
- Post tensioning
- Precast concrete
- Solid mechanics
- Structural dynamics
- Structural engineering
- Structural members
- Structural systems
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