1991 Fiscal Year Final Research Report Summary
A Study on Amplification Characteristics of Seismic Ground Motions on Irregularly Layered Structures
| Project/Area Number |
01420033
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
土木構造
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
KURIBAYASHI Eiichi Toyohashi University of Technology, Professor, 工学部, 教授 (10158884)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAMURA Makoto Toyohashi University of Technology, Associate Professor, 工学部, 助教授 (30115555)
NAGASAKA Hideaki Kumagai-gumi Co. Ltd, 電算室, 第二部
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| Project Period (FY) |
1989 – 1991
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| Keywords | Array System for Strong Earthquake Motions / Irregularly Layered Structures / Seismic Waves / Boundary Element Method / Response Analysis / Aseismatic Design / Reflectively Method / Amplification Characteristics of Seismic Ground Motions |
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| Research Abstract |
l. Details of research
To elucidate the effects of topography and underground conditions in behavior of ground motions is an important task in earthquake engineering. In order to prove the effects of topographical and geological conditions in behavior- of ground motions, an array system foiseismic ground motion was set up around Toyohashi University of Technology as the investigated area, and until now eight times of earthquake have been recorded in total. These data were analyzed in time and frequency domain. Further more, response analysis based on actual ground conditions of the investigated area has been performed. The results of comparison between experimental and theoretical analysis are as follows.
2. Results of research
(1) The resonance frequency with maximum amplitude does not depend on the local depth of the soft soil.
(2) Amplitudes are the largest at the center of the valley, and are getting smaller as nearing on the both ends of the valley.
(3) Amplification characteristics of the valley are not influenced by the incident angle of the wave and the impedance of the ground.
(4) At present, to calculate the three-dimensional response of complicated layered structures, the extending Aki-Larner technique is carried out.
3. Research program for the future
In 1992 academic year, an accelerometer was installed on the basis and three-dimensional model of the investigated area is designed. So the system is completed as the ai-ray system for strong ground motion observation to investigate the amplification characteristic of seismic ground motions- on irregularly layered structures.
In the future, we will practice the ground motion observation and experimental and theoretical analyses.
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