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Steel and Composite Structures
  Volume 44, Number 2, July 2022 , pages 283-294

Development of a seismic retrofit system made of steel frame with vertical slits
Hyungoo Kang, Michael Adane, Seungho Chun and Jinkoo Kim

    In this study, a new seismic retrofit scheme of building structures is developed by combining a steel moment frame and steel slit plates to be installed inside of an existing reinforced concrete frame. This device has the energy dissipation capability of slit dampers with slight loss of stiffness compared to the conventional steel frame reinforcement method. In order to investigate the seismic performance of the retrofit system, it was installed inside of a reinforced concrete frame and tested under cyclic loading. Finite element analysis was carried out for validation of the test results, and it was observed that the analysis and the test results match well. An analytical model was developed to apply the retrofit system to a commercial software to be used for seismic retrofit design of an example structure. The effectiveness of the retrofit scheme was investigated through nonlinear time-history response analysis (NLTHA). The cyclic loading test showed that the steel frame with slit dampers provides significant increase in strength and ductility to the bare structure. According to the analysis results of a case study building, the proposed system turned out to be effective in decreasing the seismic response of the model structure below the given target limit state.
Key Words
    cyclic test; non-linear dynamic analysis; seismic retrofit; slit damper; steel frame
Hyungoo Kang:Decomissioning Waste R&D Team, Korea Radioactive Waste Agency (KORAD), 168, Gajeong-ro, Yuseong-gu, Daejeon, Korea 34129

Michael Adane, Seungho Chun and Jinkoo Kim:Department of Global Smart City, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, Korea

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