| Project/Area Number |
20K14811
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 22020:Structure engineering and earthquake engineering-related
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
項 乃亮 名古屋工業大学, 工学(系)研究科(研究院), 助教 (10839765)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Project Status |
Granted (Fiscal Year 2020)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | Conventional dissipation / Residual deformation / Self-centering / Seismic resilience / Bridge structures / Bridge Infrastructure / Shape Memory Alloys / Conventional Damping / Seismic Devices / Seismic Resilience |
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| Outline of Research at the Start |
This study aims to develop novel SMA devices for enhancing bridge seismic resilience. Conventional damping mechanisms are combined to balance energy dissipation and self-centering of SMAs. New performance indicators, device-level design optimization, and system-level design methods are established.
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| Outline of Annual Research Achievements |
As the first stage of this research project, the seismic performance of conventional energy dissipation components in bridges was evaluated, including yielding steel dampers, friction dampers, and viscous dampers and sliding elastomeric bearings. The deficiencies of such dissipative components in terms of residual displacement/deformation were identified. The results indicate that conventional dissipative members are effective in dissipating seismic energy by displaying wide hysteresis, but result in excessive residual displacements that are unfavorable to post-earthquake performance of bridges. Therefore, the incorporation of SMAs as critical self-centering members to conventional dissipative members is essential to improve the seismic resilience of bridges.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
In the first year of the this research, in addtion to evaluating the seismic performance of the conventional energy dissipation mechanisms, the possbile combination types between conventional dissipators and SMAs should have been tried and assessed. More academic papers should have been published.
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| Strategy for Future Research Activity |
In the next research year, more related works will be done. First, try to combine SMAs and conventional dissipation mechanisms in various ways and find the optimzed one from them. Second, propose novel bridge systems with balanced energy dissipation and self-centering capacities. Third, perform quasi-static tests to evaluate the behavior of the combined components. These research outcomes will be presented in several journal papers and conference proceedings.
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