Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 31, Issue 8
Displaying 1-6 of 6 articles from this issue
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  • The State-of-the-Art on Nonlinear Earthquake Response Analysis of RC Building Structure
    Shunsuke Otani
    1993 Volume 31 Issue 8 Pages 15-23
    Published: August 01, 1993
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.31.8_15
    JOURNAL FREE ACCESS
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    The state-of-the-art on nonlinear earthquake response analysis of reinforced concrete building structures is presented with emphasis on the methods of structural idealization ; i. e., modeling of members such as beams, columns, and structural walls. Two types of modeling are necessary to represent the inelastic behavior of a reinforced concrete member ; i. e. (a) a member model to represent the distribution of damage along the member, and (b) a hysteretic model to represent the force-deformation relation at the damage. Such analyses are routinely used in the design of a high-risereinforced concrete building, but some problems must yet be clarified, such as the methods to evaluate the hysteretic properties on the basis of material characteristics and member geometry.
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  • State-of-the-Art Report on Externally Prestressed Concrete
    Hiroshi Mutsuyoshi
    1993 Volume 31 Issue 8 Pages 24-35
    Published: August 01, 1993
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.31.8_24
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    An externally prestressed concrete structure reinforced with prestressing steel outside the concrete section has been developed mainly in France. In Japan, this system has been used for the retrofit of damaged concrete structures or partially prestressed concrete structures. And recently, prestressed concrete structures using external cables as main tendons have been erected. This paper is a state-of-the-art report on externally prestressed concrete structures.
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  • On the Flowable Concrete Used in the Diaphragm Wall of Kawasaki Man-Made Island
    Y. Sano, H. Ikeda, M. Matsukida, M. Nakano
    1993 Volume 31 Issue 8 Pages 36-53
    Published: August 01, 1993
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.31.8_36
    JOURNAL FREE ACCESS
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    The world's largest diaphragm wall was recently completed as an important part of the Kawasaki man-made island. The man-made island is an essential element of the Trans-Tokyo Bay Highway Project, which is extolled as one of Japan's leading marine projects. The cylindrical diaphragm wall has a 103.6 m outside diameter, a 119 m depth, and a 2.8 m thickness. 120 thousands m3 of concrete was used to build this gigantic wall. In designing the concrete mix, a combination of fly ash and cement with low hydration heat is used in place of normal cement to reduce the cracking potential and enhance the workability of the concrete. One apparent benefit of using this mix is that the resulting flowable concrete can be continuously conveyed in the field over a long distance for a long period of time, while the pressure required for pumping the concrete can be somewhat reduced. To ensure that the concrete used in the field meets all the design specifications, laboratory tests as well as field quality control tests were performed. Based on the results of laboratory tests performed on high strength, low hydration heat concrete, this paper describes the inspection conducted on the field quality control tests, analyzes the data obtained, and reports the observations made during the placement.
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  • Labor Saving Operation for Resort Facilities
    Adoption of the Concrete Distributor and the Shoring System
    S. Ueno, T. Ueno, T. Sawada, H. Kaida
    1993 Volume 31 Issue 8 Pages 54-63
    Published: August 01, 1993
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.31.8_54
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    For the purposes of labor saving operations and saving the use of wood forms, the method using prefabricated assemblies and the machines thereof have been adopted in the construction of resort facilities in remote, secluded areas. Precast concrete assemblies are used at the various types of sites in the construction of high-rise condominiums to systemize the whole phase of construction. Among other things, a new shoring system using a jig with the counterweight moving mechanism has been introduced for dealing with the balcony half-precast slabs for safe construction work without the use of scaffolds and with the minimal number of workers. For the construction of low-rise buildings in which labor saving is difficult to be applied effectively, but the concrete distributor able to save labor for the concrete placing work which requires a lot of labor. This is the report outlining the shoring system and the concrete distributor and also the results of research concerning operation efficiency. Our research findings indicate that this new method for concerning operation efficiency, when compared to previous method, clearly shows that labor saving has been achieved to a substantial extent.
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 31 Issue 8 Pages 78-83
    Published: August 01, 1993
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.31.8_78
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  • [title in Japanese]
    [in Japanese]
    1993 Volume 31 Issue 8 Pages 84-88
    Published: August 01, 1993
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.31.8_84
    JOURNAL FREE ACCESS
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