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Steel and Composite Structures Volume 51, Number 2, April 25 2024 , pages 173-183 DOI: https://doi.org/10.12989/scs.2024.51.2.173 |
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Performance-based seismic design of a spring-friction damper retrofit system installed in a steel frame |
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Masoum M. Gharagoz, Seungho Chun, Mohamed Noureldin and Jinkoo Kim
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| Abstract | ||
| This study investigates a new seismic retrofit system that utilizes rotational friction dampers and axial springs. The retrofit system involves a steel frame with rotational friction dampers (RFD) at beam-column joints and linear springs at the corners, providing energy dissipation and self-centering capabilities to existing structures. The axial spring acts as a selfcentering mechanism that eliminates residual deformations, while the friction damper mitigates seismic damage. To evaluate the seismic performance of the proposed retrofit system, a series of cyclic loading tests were carried out on a steel beam-column subassembly equipped with the proposed devices. An analytical model was then developed to validate the experimental results. A performance point ratio (PPR) was presented to optimize the design parameters of the retrofit system, and a performancebased seismic design strategy was developed based on the PPR. The retrofit system's effectiveness and the presented performance-based design approach were evaluated through case study models, and the analysis results demonstrated that the developed retrofit system and the performance-based design procedure were effective in retrofitting structures for multi-level design objectives. | ||
| Key Words | ||
| performance-based seismic design; seismic retrofit; self-centering; steel frame | ||
| Address | ||
| Masoum M. Gharagoz:1)Department of Civil Engineering, School of Engineering, Aalto University, Finland 2)Department of Global Smart City, Sungkyunkwan University, South Korea Seungho Chun:Department of Global Smart City, Sungkyunkwan University, South Korea Mohamed Noureldin:Department of Civil Engineering, School of Engineering, Aalto University, Finland Jinkoo Kim:Department of Global Smart City, Sungkyunkwan University, South Korea | ||