2007 Fiscal Year Final Research Report Summary
Fundamental study on failsafe structural systems against large earthquakes using uplift mechanism
| Project/Area Number |
18560572
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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 |
Building structures/materials
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| Research Institution | National Institute for Land and Infrastructure Management |
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Principal Investigator |
AZUHATA Tatsuya National Institute for Land and Infrastructure Management, Building Department, Senior Researcher (00251629)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIHARA Tadashi National Institute for Land and Infrastructure Management(NILIM), Building Department, Senior Researcher (50370747)
MIDORIKAWA Mitsumasa Hokkaido University, Graduate School of Engineering, Professor (90126285)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Uplift / Fail safe / Large earthquake / Shaking table test / Vibration control system |
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| Research Abstract |
This study aims to investigate possibility and efficiency of a failsafe structural system using uplift mechanism to make buildings safety even against larger earthquake response effects than those estimated with ordinal seismic design codes. Previous studies have cleared that rocking vibration accompanied with uplift motion might reduce the seismic damage of buildings subjected sever earthquake motions. The proposed fat-1mi. system is based on this knowledge. This system shows seismic response characteristics of a fixed column base system under certain seismic input leveL But it starts rocking once the seismic input level exceeds the limit. Uplift response due to the rocking will restrain ascent of seismic input to the structures.
Firstly, to introduce uplift mechanism to building structures, the following research items were studied.
1) Steel frame systems utilizing uplift mechanism
2) Restoring force characteristics of column bases to make steel frames uplift
Secondary, to develop more appropriate seismic performance evaluation methods for rocking structures, the following research items were studied.
3) Seismic lateral force distribution of rocking structures
4) Effect of floor incline during an earthquake to indoor objects in rocking structures Finally, the following research item was studied based on earthquake response analyses using simplified building structural models.
5) Efficiency of the proposed failsafe system using uplift mechanism against sever earthquake ground motions
Through these studies, some frame systems and structural members for rocking structures were proposed and uplift response characteristics were analyzed quantitatively. And the efficiency of the proposed failsafe system against sever earthquakes was confirmed. When we apply this system to buildings with a high aspect ratio, it can provide them superior seismic performance, which is almost equal to that of passive vibration control systems with hysteresis dampers.
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[Journal Article] Seismic Response of Eccentrically Braced Steel Frames With Partial Columns Allowed to Uplift2008
Author(s)
Midorikawa, M. Toyomaki, S., Hori, H., Asari, T. Azuhata, T. Ishihara, T.
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Journal Title
Journal of Structural Engineering, AIJ, Vol. 54B
Pages: 535-545
Description
「研究成果報告書概要(欧文)」より
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