Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 35, Issue 10
Displaying 1-6 of 6 articles from this issue
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  • Present Condition of Seismic Retrofit of Buildings in Japan
    Masaya Hirosawa
    1997 Volume 35 Issue 10 Pages 3-8
    Published: 1997
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.35.10_3
    JOURNAL FREE ACCESS
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    Since the 1995 Great Hanshin Earthquake, seismic retrofit of existing buildings are rapidly promoted mainly on public buildings. Objective buildings for retrofitting are medium-and lowrised reinforced concrete buildings such as school buildings, office buildings, hospitals etc. and gymnasiums of steel structure. Seismic diagnosis and seismic retrofit design are carried out by structural engineers conforming to technical guidelines compiled by the ministry, but shortage of the engineer is distinguished. Steel braces or concrete shear walls is mainly used as main retrofitting techniques for reinforced concrete buildings and the retrofit does not cause much functional drop in case of school. Retrofit construction cost corresponds to around from 10% to 20% of those for re - construction of the building. However, seismic diagnosis and retrofit of private buildings are scarcely carried out. Retrofit of multi-stories buildings and buildings on use by the current techniques are generally difficult and new techniques such as retrofit by base isolation are now discussed.
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  • Current Status of Seismic Strengthening Methods for Railway Reinforced Concrete Viaducts
    N. Matsumoto, T. Sato
    1997 Volume 35 Issue 10 Pages 9-17
    Published: 1997
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.35.10_9
    JOURNAL FREE ACCESS
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    After Kobe Earthquake, an urgent seismic strengthening has been conducted for railway reinforced concrete viaducts. As the main strengthening method, the steel jacket is used. On the other hand, new handy seismic strengthening methods using fiber reinforced plastics and so forth have been developed. Design and construction guidelines adopting limit state design method have been implemented in some of these new methods. This report introduces characteristics of these recent seismic strengthening methods and their design principles including steel jacket strengthening and reinforced concrete strengthening.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1997 Volume 35 Issue 10 Pages 19-22
    Published: 1997
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.35.10_19
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1997 Volume 35 Issue 10 Pages 23-27
    Published: 1997
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.35.10_23
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1997 Volume 35 Issue 10 Pages 28-32
    Published: 1997
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.35.10_28
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1997 Volume 35 Issue 10 Pages 74-76
    Published: 1997
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.35.10_74
    JOURNAL FREE ACCESS
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