Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 30, Issue 6
Displaying 1-10 of 10 articles from this issue
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  • Application of Fracture Mechanics to Concrete Structures
    Hirozo Mihashi, Nobuaki Shirai, Keitetsu Rokugo
    1992 Volume 30 Issue 6 Pages 5-17
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_5
    JOURNAL FREE ACCESS
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    This contribution reviews a rapidly advancing field of fracture mechanics of concrete, which covers softening behavior, fracture localization, and size effect on strength of concrete structures. Recent applications of fracture mechanics to concrete structures are described from the following three aspects : (1) applications to evaluation and development of material, (2) applications to numerical analysis, and (3) applications to structural design. It is demonstrated that fracture mechanics gives useful knowledge for development of higher performance cement composites. The nonlocal theory and the arc-length method for numerical analysis of softening behavior are introduced. Design code formulas for calculation of size dependent strengths of concrete structures are presented. Attractive research subjects in JCI and RILEM committees concerning concrete fracture mechanics are summarized.
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  • Present State and Tasks for Future Development of Shotcrete Execution
    Yujiro Tazawa
    1992 Volume 30 Issue 6 Pages 18-26
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_18
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    Accompanying the proliferation of NATM as a generally used method in tunnel construction, technical development of shotcrete is being actively performed through joint efforts by private and governmental organizations. As a result, construction equipment has been developed which is capable of executing shotcrete at a rate of over 10 m3/hr. However, the large amounts of dust and rebound have been pointed out as problems, and in spite of the various improvements which have been made, a satisfactory state has not been attained. Thus, development in this aspect is urgently needed. In this paper the author describes the present state of shotcrete execution, introduces the new materials, equipment and methods of execution which have recently come into use with this method, and describes the tasks for future development. Further, the author introduces Austrian standards as an example of foreign standards concerning this method, and describes examples of permanent linings constructed by this method which is recently being applied with increasing frequency in Europe together with problems in its application.
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  • Report on Alternative Repeated Static Loading Test Conducted on Prestressed Concrete Beam-Column Joint Model Specimens
    R. Okamoto, K. Takasaki, K. Tanabe, N. Satoh
    1992 Volume 30 Issue 6 Pages 27-38
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_27
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    The present experiment was conducted aiming at examining what extent of damage in terms of rigidity and load capacity major building materials such as beam-column joints would suffer in the event of an earthquake. Accordingly, the strength and load capacity of the beam-column joints were confirmed. In the present experiment, special emphasis was placed on obtaining a restoring force characteristics of compressed joints in a precast prestressed concrete construction. As a result, the compressed joints were found to have sufficient jointing effects, revealing sufficient safety factors under application of a ± 1/100 rad storied displacement, and resisting breakdown even under application of ± 1/25 rad. From the fact that no cracking was found to occur in the panel zone, this construction may said to make up an efficient reinforcing method for the panel zone.
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  • Construction of the Kikkou Bridge
    T. Kumaoka, N. Oda, K. Shimizu, E. Itai
    1992 Volume 30 Issue 6 Pages 39-47
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_39
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    The Kikkou Bridge is a prestressed concrete (PC) stress ribbon bridge of three-directional symmetry, linked by thin concrete slabs toward the center from the three abutments. About ten stress ribbon bridges have already been constructed in Japan. The maximum span among them is more than 100 m. And also, the examples of milti-span bridges have been reported. However, the stress ribbon bridge linked three direction is the first adoption in the world. The bridge was so designed and constructed as if it were a wooden suspension bridge. And the bridge was constructed by a construction method that precast slabs were erected to tensioned steel without stagings. Formation and tension of stands under construction were controlled by the developed automatic instrumentation system, which is able to measure and to do picture processing in realtime. This report summarizes the outline of the structures and the characteristics of the construction method of the Kikkou Bridge.
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  • Construction of Large Scale Building in Using Expansive Concrete
    I. Tsuyama, A. Kikuchi, M. Nakanishi, N. Miyake, T. Watanuki
    1992 Volume 30 Issue 6 Pages 48-57
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_48
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    Cracks which occur in reinforced concrete are possible to damage building durability and to cause water leakage, and it is not favorable from the point of beauty also. Upon this, recently using expansive concrete in cooperation with sophisticated design and construction succeeded to restrain injurious cracks perfectly at newly constructed large scale research building in Tsukuba City, the total floor area is 35 000 m2. Gauges were buried into concrete and specimens were made to measure expansion and shrinkage properties. Furthermore specimens were tested on flexural strength and crack properties of the specimens compared with ordinary reinforced concrete were measured. We report the concerned construction synopsis and the test results.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1992 Volume 30 Issue 6 Pages 58
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_58
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 30 Issue 6 Pages 59-62
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_59
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 30 Issue 6 Pages 65-70
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_65
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 30 Issue 6 Pages 86-93
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_86
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1992 Volume 30 Issue 6 Pages 94-100
    Published: June 01, 1992
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.30.6_94
    JOURNAL FREE ACCESS
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