| Project/Area Number |
17K14713
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Saitama University |
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Principal Investigator |
Goit Chandra 埼玉大学, 理工学研究科, 助教 (10782732)
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | SPSP foundation / Nonlinear behavior / SSI / Impedance functions / Kinematic interaction / SPSP Foundations / Nonlinearity |
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| Outline of Final Research Achievements |
Nonlinear dynamic response of a Steel Pipe Sheet Pile (SPSP) foundation is studied through model testing under 1g conditions, accounting for the effects of soil-structure interactions (SSI). A circular 1/16.5 model SPSP foundation comprising of 20 hollow circular aluminum pipes (outer diameter = 30 mm and wall thickness = 2 mm) with lengths of 960 mm, embedded in dry cohesionless soil, was considered. Specifically, the kinematic and inertial responses of the foundation were obtained in the form of kinematic interaction factors (KIF) and head level horizontal impedance functions (hIFs) under a low-to-high level of dynamic loading for a broad range of frequencies. Results obtained through this work show that both the KIF and hIFs (essential components for SSI calculations) are dependent on soil nonlinearity. In the light of such, it can be inferred that the general methodologies that assumes soil as an elastic or visco-elastic material may not be conservative for the analysis and design.
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| Academic Significance and Societal Importance of the Research Achievements |
Though the use of Steel Pipe Sheet Pile (SPSP) foundations is on the rise in recent years, their dynamic characteristics are largely unknown. This work details such characteristics considering the effects of soil-structure interaction that are essential for the seismic analysis of SPSP foundations.
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