| Project/Area Number |
11450207
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | Science University of Tokyo |
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Principal Investigator |
SHINOZAKI Yuzo Science University of Tokyo Dept.of Architecture, Professor, 工学部, 教授 (80026236)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Kazuhiro Science University of Tokyo Shimiz Corp., Research Institute Senior Researcher, 技術研究所・基礎研究室, 主任研究員
NISHIMURA Naoshi Science University of Tokyo Kyoto University Dept.Global Env.Eng., Associate Professor, 工学研究科, 助教授 (90127118)
IGUCHI Mitio Science University of Tokyo Dept.of Architecture, Professor, 理工学部, 教授 (60084456)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥9,000,000 (Direct Cost: ¥9,000,000)
Fiscal Year 2000: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1999: ¥6,700,000 (Direct Cost: ¥6,700,000)
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| Keywords | Ground motion / Boundary element method / Pile Foundation / Multiple pole method / Nonlinear response / Soil characteristics / Inverse problem |
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| Research Abstract |
A direct 2.5 dimensional boundary element method is applied to evaluate strong ground motions in two-dimensional sedimentary basin due to a three-dimensional Haskell-type fault to estimate the amplification characteristics of the ground motions in the heavily damaged belt zone in Kobe City during the 1995 Hyogo-ken earthquake. The effects of different types of cross-section of the sedimentary basin on the strong gound motions in the basin are examined in detail.
We discuss a three-dimensional fast multiple boundary integral equation method for crack problems in Laplace's equation. The proposed implementation uses a new multipole expansion proposed by Hrycak and Rokhlin in conjunction with collocation in the solution of a discretised hypersingular boundary integral equation for crack problems. The resulting numerical equation is solved with GMRES(generalised minimum residual method) in connection with FMM(fast multipole method). It is found that the obtained code is faster than a conventional one when the number of unknowns is greater than about 1300.
We present a method to evaluate time-varying nonlinear dynamic soil resistance to a pile when subjected to horizontal excitations on the top of the pile. In the procedure only bending moments at some points on the pile are assumed to be given in advance by observation. Special consideration to a data processing method, which combines a smoothing procedure for given data and introduction of regularization with a penalty matrix, is made for improving the accuracy of the estimation from the observed data including measurement errors. The validity of the proposed procedure is studied and confirmed through numerical examples.
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