2002 Fiscal Year Final Research Report Summary
Seismic Damage Prediction and Control in Urban Region Based on Integrated Whole System with Source and Propagation Path and Structure
| Project/Area Number |
12450226
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
KAWANO Masahiro Graduate School of Eng., Professor, 工学研究科, 教授 (20026090)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUDA Satoshi Kansai Univ., Faculty of Eng., Assistant, 工学部, 助手 (60278603)
ASANO Koichiro Kansai Univ., Faculty of Eng., Professor, 工学部, 教授 (80067644)
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| Project Period (FY) |
2000 – 2002
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| Keywords | ground motion model / wave propagation theory / base isolated building / response prediction / alluvial valley / surface wave / random response analysis / seismic reliability |
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| Research Abstract |
(1) Structural responses of base isolated buildings and high-rise buildings were predicted on the basis of the ground motion models for the next four great events in Japan: the Minami Kanto Earthquake, the Tokai Earthquake, the Nobi Earthquake and the Yamasaki Earthquake. The prediction results indicate that the ground motion and building structural response are mainly described by the focal distance, geometric relation between site and source, site geological structure, asperity strength and distribution on the fault plane, and source directivity effect.
(2) The ground motions in various shapes of alluvial valleys were computed by using a new hybrid method of Riccati equation approach for the wave field inside the basin and the direct BEM for the rest. And we introduced and defined an equivalent flat layer model. The thickness of the surface flat layer was determined so that the theoretical dispersion curve of the surface wave in the flat layer fitted best the one in the alluvial valley. An examination of various cases indicates that complicated amplification patterns induced in alluvial valleys are simply and essentially explained by interference phenomena among the direct wave and the surface waves generated on the valley edges with phase velocities evaluated from the equivalent flat layer model.
(3) We developed an analytical approach to estimating an overall seismic reliability or hazardness of structures based on the earthquake excitation model predicted for Osaka city area. And some numerical examples were given to am overall seismic reliability or hazardness of steel and reinforced concrete building structures in Osaka city area. Furthermore, in order to examine the applicability or validity of the developed seismic reliability analysis, a comparison was made between the analytical reliability and the damage magnitude for the 1995 Hyogo-ken Nanbu Earthquake.
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