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Structural Engineering and Mechanics Volume 82, Number 4, May25 2022 , pages 435-444 DOI: https://doi.org/10.12989/sem.2022.82.4.435 |
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A novel longitudinal seismic self-centering system for RC continuous bridges using SMA rebars and friction dampers |
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Nailiang Xiang, Nanyi Jian and Tetsuya Nonaka
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| Abstract | ||
| This study proposes a novel longitudinal self-centering earthquake resistant system for reinforced concrete (RC) continuous bridges by using superelastic shape memory alloy (SMA) reinforcement and friction dissipation mechanism. The SMA reinforcing bars are implemented in the fixed piers to provide self-recentering forces, while the friction dampers are used at the movable substructures like end abutments to enhance the energy dissipation of the bridge system. A reasonable balance between self-centering and energy dissipation capacities should be well achieved by properly selecting the parameters of the SMA rebars and friction dampers. A two-span continuous bridge with one fixed pier and two abutments is chosen as a prototype for illustration. Different longitudinal earthquake resistant systems including the proposed one in this study are investigated and compared. The results indicate that compared with the designs of over-dissipation (e.g., excessive friction) and over-selfcentering (e.g., pure SMAs), the proposed system with balanced design between self-centering and energy dissipation would perform satisfactorily in controlling both the peak and residual displacement ratios of the bridge system. | ||
| Key Words | ||
| balanced design; friction dampers; RC continuous bridge; seismic self-centering system; SMA rebars | ||
| Address | ||
| Nailiang Xiang: School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Department of Civil Engineering, Nagoya Institute of Technology, Gokiso-cho, Nagoya, 466-8555, Japan Nanyi Jian: Department of Civil Engineering, Nagoya Institute of Technology, Gokiso-cho, Nagoya, 466-8555, Japan; Department of Structural Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China Tetsuya Nonaka: Department of Civil Engineering, Nagoya Institute of Technology, Gokiso-cho, Nagoya, 466-8555, Japan | ||