Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 27, Issue 2
Displaying 1-6 of 6 articles from this issue
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  • The Trend of Earthquake Resistant Design of Reinforced Concrete Buildings
    T. Shibata
    1989 Volume 27 Issue 2 Pages 9-19
    Published: February 01, 1989
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.27.2_9
    JOURNAL FREE ACCESS
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    Eight years have elapsed since the provisions for earthquake resistant design in the Building Standard Law and its Enforcement Order in Japan were fundamentally revised in 1980 after a lapse of 30 years from the legislation. As the time of confusion among the engineers has gone on, the “new” requirements seem to have been stably fixed as the accustomed code. Although they are called “new”, the main current in practice of the design remains in the category of the allowable stress design method as it was. In this paper, it is intended to light up the position of the “new” code requirements by comparing the historical aspects of the earthquake resistant design requirements in Japan with those in United States, and some prospective movements are discussed.
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  • Improvement of Durability and Appearance of Concrete Structures by Finishing Materials
    T. Mukai
    1989 Volume 27 Issue 2 Pages 20-29
    Published: February 01, 1989
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.27.2_20
    JOURNAL FREE ACCESS
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    The reinforced concrete structure is always influenced by CO2 in the air. Furthermore, a certain structure is subject to the effect of chloride and freezing and thawing action. Consequently, deteriorating phenomena appear in some structures, such as crack in the concrete, corrosion of reinforced bar, and excessive deflection in the member, and these cause a decrease in the durability and damage in the beauties of the structure. This article describes how successfully deterioration can be controlled and beauty appearance promoted by the protection of the reinforced concrete structure with the application on the surface of various kinds of finishing and impregnating materials.
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  • A Study on Durability of Cracked Reinforced Concrete Members
    T. Akimoto, H. Kosaka, H. Yamauchi
    1989 Volume 27 Issue 2 Pages 31-39
    Published: February 01, 1989
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.27.2_31
    JOURNAL FREE ACCESS
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    The aim of this investigation is to study the rate of deterioration of flexural strength by testing reinforced concrete members after letting them outside with fixed crack width for a given period of time. This report summarizes 12 years results within the investigation period of 20 years.
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  • A Design and Construction of Building G at Ohkawabata River City Housing Estate
    T. Tomita, S. Konomi, K. Sueoka
    1989 Volume 27 Issue 2 Pages 40-48
    Published: February 01, 1989
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.27.2_40
    JOURNAL FREE ACCESS
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    The building G at Ohkawabata River City Housing Estate is 19-storey high-rise condominium building consisted of rigid frame structure by Steel Reinforced Concrete. Because the plan is L shaped due to the block plan, it was considered in the structural design that the dynamic analysis which was taken the effect of cracks into consideration and assurance of beam-yield mechanism, etc. The flat ceilings of rooms without mid beams were realized by unbonded prestressed concrete slab. For rationalization of construction work, steel members and reinforcing bars prefabricated to combine on-site and half precasted concrete panel were employed to balcony. High strength concrete (Fc=300 kgf/cm2) flowed by using plasticizing admixture was placed by concrete pump. We report the structural design and construction of the building G.
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  • Construction of the Superstructure of the Berth using Submersible Mobile Stage
    M. Matsukida, I. Mutoh, S. Ohtsuka
    1989 Volume 27 Issue 2 Pages 50-58
    Published: February 01, 1989
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.27.2_50
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    The No. 2 coal loading berth for vessels up to 100000 D. W. T. at the Matsuura Power Plant of the Electric Power Development Company is 30 m wide and 350 m long. The berth is constructed of vertical steel piles with a reinforced concrete deck. In construction of the concrete deck, a steel stage was developed for forming and support of the concreting work. The stage is reusable. It can be dismantled and submerged and then moved to another construction block. Use of this stage contributes to reduction of the construction period and construction costs. This paper gives an outline of this submersible mobile stage and its method of use in constructing a concrete deck.
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  • [title in Japanese]
    1989 Volume 27 Issue 2 Pages 88-91
    Published: February 01, 1989
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.27.2_88
    JOURNAL FREE ACCESS
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