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Steel and Composite Structures Volume 52, Number 3, August 10 2024 , pages 357-376 DOI: https://doi.org/10.12989/scs.2024.52.3.357 |
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Hysteresis performance of earthquake-damaged resilient RAC shear walls retrofitted with CFRP strips and steel plates |
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Jianwei Zhang, Siyuan Wang, Man Zhang, Yuping Sun and Hongwei Wang
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| Abstract | ||
| In this paper, weakly bonded ultra-high-strength steel bars (UHSS) were used as longitudinal reinforcement in recycled aggregate concrete shear walls to achieve resilient performance. The study evaluated the repairability and hysteresis performance of shear walls before and after retrofitting. Quasi-static tests were performed on recycled aggregate concrete (RAC) and steel fiber reinforced recycled aggregate concrete (FRAC) shear walls to investigate the reparability of resilient shear walls when loaded to 1% drift ratio. Results showed that shear walls exhibited drift-hardening properties. The maximum residual drift ratio and residual crack width at 1% drift ratio were 0.107% and 0.01 mm, respectively, which were within the repairable limits. Subsequently, shear walls were retrofitted with bonded X-shaped CFRP strips and steel plates wrapped at the bottom and retested. Except for a slight reduction in initial stiffness, earthquake-damaged resilient shear walls retrofitted with a composite method still had satisfactory hysteresis performance. A revised damage assessment index D, has been proposed to assess of damage degree. Moreover, finite-element analysis for the shear wall before and after retrofit retrofitting was established in OpenSees and verified with experimental results. The finite element results and test results were in good agreement. Finally, parametric analysis was performed. | ||
| Key Words | ||
| carbon-fiber-reinforced polymers; damage assessment; hysteresis performance; resilient shear walls; retrofit | ||
| Address | ||
| Jianwei Zhang:Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China Siyuan Wang:Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China Man Zhang:Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China Yuping Sun:Department of Architecture, Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan Hongwei Wang:Key Laboratory of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China | ||