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      저자 : Mohammad Seddiq Eskandari Nasab (검색결과 2 건)
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      • Seismic retrofit system made of viscoelastic polymer composite material and thin steel plates

        Mohammad Seddiq Eskandari Nasab,Seungho Chun,Jinkoo Kim 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.2

        In this study, a series of cyclic loading tests were performed on viscoelastic dampers (VED) composed of viscoelastic polymer composite material and thin steel plates to observe the variation of the mechanical properties under different loading conditions. A mathematical model was developed based on the Kelvin–Voigt and Bouc–Wen models to formulate the nonlinear force-displacement relationship of the viscoelastic damper. The accuracy of the proposed mathematical model was verified using the data obtained from the tests. The mathematical model was applied to analyze a reinforced concrete framed structure retrofitted with viscoelastic dampers. Nonlinear dynamic analysis results showed that the average maximum inter-story drift ratios of the retrofitted structure met the target limit state after installing the VED. In addition, both the maximum and residual displacements were significantly reduced after the installation of the VED.

      • Full-scale tests of two-story RC frames retrofitted with steel plate multi-slit dampers

        Mohammad Mahdi Javidan,Mohammad Seddiq Eskandari Nasab,Jinkoo Kim 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.5

        There is a growing need of seismic retrofit of existing non-seismically designed structures in Korea after the 2016 Gyeongju and 2017 Pohang earthquakes, especially school buildings which experienced extensive damage during those two earthquakes. To this end, a steel multi-slit damper (MSD) was developed in this research which can be installed inside of partition walls of school buildings. Full-scale two-story RC frames were tested with and without the proposed dampers. The frames had structural details similar to school buildings constructed in the 1980s in Korea. The details of the experiments were described in detail, and the test results were validated using the analysis model. The developed seismic retrofit strategy was applied to a case study school building structure, and its seismic performance was evaluated before and after retrofit using the MSD. The results show that the developed retrofit strategy can improve the seismic performance of the structure to satisfy a given target performance level.

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