1999 Fiscal Year Final Research Report Summary
A Research on the Structural Dynamics due to Short-Period Surface Waves
| Project/Area Number |
10650468
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
構造工学・地震工学
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| Research Institution | Tohoku Institute of Technology |
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Principal Investigator |
KAMIYAMA Makoto Tohoku Institute of Technology, 工学部・土木工学科, 教授 (50085461)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUKAWA Tadashi Tohoku Institute of Technology, 工学部・土木工学科, 助手 (00165789)
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| Project Period (FY) |
1998 – 1999
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| Keywords | Surface Waves / Short-Period / Love Wave / Rayleigh Wave / Irregular Ground / strair / Pseudo-spectral Method / Array Strong-Motion Records |
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| Research Abstract |
Some computer programs were developed to analyze the earthquake responses of horizontally irregular grounds and their corresponding earthquake damage mechanism using the "Pseudo-Spectral Method." These programs include several new methods: it can analyze seismic responses separately for SH wave and P-SV waves; it can effectively absorb artificially-generated waves at the analytical boundaries; and it can capture clearly the process in which the short-period surface waves are secondarily generated due to horizontally irregular grounds. In addition, we developed a new technique by which the generation processes of short-period surface waves can be visually and dynamically expressed on the display of computers. This technique enables us to interpret detailed propagation mechanism of short-period surface waves. We also analyzed array strong-motion records to estimate strains and stresses related with short-period surface waves. This analysis made it clear that short-period surface waves produce large strains leading to earthquake damage of various kinds of structures such as buried life-line structures. Finally we published a report to compile the above outcomes derived by this research project.
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