NIPPON GOMU KYOKAISHI
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Volume 85, Issue 4
Displaying 1-8 of 8 articles from this issue
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Introductory Remarks
Special Issue for General Reviews “Elastomers for seismic base isolation and vibration control”
General Reviews
  • Present and Future of Seismic Protection System
    Toshio NISHI
    2012 Volume 85 Issue 4 Pages 117-122
    Published: 2012
    Released on J-STAGE: August 02, 2013
    DOIhttps://doi.org/10.2324/gomu.85.117
    JOURNAL FREE ACCESS
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    Recent advances and future prospects in the field of seismic-protection system are reviewed with emphasis on seismic-protection elastomeric isolators and seismic-control system. Some examples of the system behavior at The East Japan Giant Earthquake on March 11, 2011 with magnitude 9.0 were shown and the system worked very effectively at the giant earthquake.
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  • Development of the International Standard (ISO) and Japanese Industrial Standard (JIS) for Elastomeric Seismic-Protection Isolators
    Toshikazu YOSHIZAWA
    2012 Volume 85 Issue 4 Pages 123-130
    Published: 2012
    Released on J-STAGE: August 02, 2013
    DOIhttps://doi.org/10.2324/gomu.85.123
    JOURNAL FREE ACCESS
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    A massive earthquake of magnitude 9.0 occurred on the Pacific coast of Japan on March 11th, 2011. This earthquake caused terrible damages and the Tsunami brought the loss of tens of thousands of lives. However, the base-isolated hospitals in the area maintained full operational under those disastrous conditions.
    In this paper, the performance and effect of isolated structures during the Tohoku earthquake are introduced, and the comments are followed related to the ISO and JIS standard for elastomeric seismic-isolation bearings.
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  • Elastomeric Seismic-protection Isolators for Bridges
    Eiji KOBAYASHI, Kazuhiro KANEKO
    2012 Volume 85 Issue 4 Pages 131-137
    Published: 2012
    Released on J-STAGE: August 02, 2013
    DOIhttps://doi.org/10.2324/gomu.85.131
    JOURNAL FREE ACCESS
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    Bridge bearings are products disposed between the top of the abutment or pier and the bottom of the girder. It has three basic features. The first one is the supporting capability against vertical and lateral loads. The second one is the horizontally mobile capability that can permit the expansion and contraction with temperature and the creep of the bridge girder. The last one is the rotational capability that can permit the rotational deformation at the fulcrum caused by the girder bending during vehicle pass.
    In recent years, in addition to these basic functions, bearings have been responsible for the isolation function and the damping function to enhance the overall seismic capacity of bridges during the earthquake. Therefore, since the Hanshin-Awaji Earthquake has happened, bridge spanning the road around the high standards, such as highways and national roads have been adopted to increase the rubber bearing with the high isolation capability and damping function.
    We describe the structure, the characteristic, the design and quality control method of the rubber bearings.
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  • The Property of Buildings with Seismic Isolation Systems in the 2011 Tohoku Offshore the Pacific Coast Earthquake
    Nobuyuki OGINO, Yoshihisa KITAMURA, Nagahide KANI
    2012 Volume 85 Issue 4 Pages 138-145
    Published: 2012
    Released on J-STAGE: August 02, 2013
    DOIhttps://doi.org/10.2324/gomu.85.138
    JOURNAL FREE ACCESS
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    The Tohoku Offshore the Pacific Coast Earthquake occurred on March 11th 2011 as scale M: 9.0, which was with a number of aftershocks; (up to April 11th, for one month, four times >M7, forty-six times >M6, two hundred times >M5).
    There are more than 3,000 buildings with seismic- isolation in Japan. The effects of seismically isolated (SI) buildings were extremely excellent during earthquakes. Displacements of SI buildings by installed tracers in Tohoku & Kanto Area were as follows;
    Tohoku: 15~20 cm (Average), 40 cm (Maximum)
    Kanto: 5~8 cm (Average), 15 cm (Maximum)
    Also, SI effects were confirmed from seismographs records. Real perceptions of occupants reconfirmed SI effects. Nothing fell nor moved such as furniture, household-articles in SI buildings. There is no problem in the business continuation in the offices or factories with SI.
    JSSI had set up the committee for response-controlled (RC) buildings regarding the 2011 Tohoku earthquake. The committee is investigating, analyzing and reviewing the behavior of RC buildings. JSSI will confirm the effect of these RC structures, also identify problems concerning these structures, and solve them. The activities of the committee will contribute to future disaster prevention and to technical development. This paper shows the synopses of these activities.
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  • Seismic Isolation Technology -Its Process of Spread and Future
    Keiichi NISHIO
    2012 Volume 85 Issue 4 Pages 146-149
    Published: 2012
    Released on J-STAGE: August 02, 2013
    DOIhttps://doi.org/10.2324/gomu.85.146
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    Process of the spread of seismic isolation technology and its future were reviewed.
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Technical Note
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