Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
Volume 29, Issue 9
Displaying 1-4 of 4 articles from this issue
  • Rentaro Naniwa
    1991 Volume 29 Issue 9 Pages 5-18
    Published: September 01, 1991
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    In building, the external surface on concrete walls is covered generally with spraying materials or ceramic tiles and in between a cement mortar rendering. Since the 1964 Olympic Games held in Tokyo, due to mass production, the number of larger and taller buildings has increased. The fall-off type of failure, in which unbonded sections fall from substrate has also shown an increase. Northern Kyûshû was witness to just such an accident when in late autumn 1989, two people were killed and one injured. Immediately after that, the Japan Society for Finishings Technology organised a committee for preventive measures against these failures, of which the author is presently chairman. In this article, based on a report of the finding of this committee, the author explains the actual situation concerning preventive measures : History of materials and techniques; Diagnosis and repairing technics of exterior walls ; Guide to project and execution of fall-off proof building; Investigative studies of existing diagnosis of defects and repaired examples.
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  • Noboru Saeki
    1991 Volume 29 Issue 9 Pages 19-27
    Published: September 01, 1991
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    Recently the design for torsion has become an increasingly greater important for constructions of large, curved or slender concrete structures in the ocean and underground. This paper deals with the elemental and useful information for design of torsional stresses by elastic and plastic analyses, the torsional reinforcement and torsional resistance by space truss model. The theories of simple torsion, warping torsion and plastic torsion are explained to design the torsion problems of cracking moment, the resistance moment without torsional reinforcement and decision on the requirement condition of reinforcement. There are two analyses to estimate the ultimate torsional strength of reinforced concrete member. One is space truss model and the other is skew-bending model. On the space truss model it is available to design the torsional reinforcement and analyze the behaviour of the reinforced members subjected to combined torsion and bending. Therefore this model is generally used to design and on the base of the model the torsional reinforcement and resistance are assessed to design the concrete structures.
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  • Susumu Kobayashi, Susumu Nagae
    1991 Volume 29 Issue 9 Pages 28-37
    Published: September 01, 1991
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    Fukazawa arch culvert was constructed along the bottom of a steep gorge enabling the highway to cross it over the structure. The arch culvert carries a municipal road and a river inside. The outline of the structure is shown as follows; arch span : 30.0 m, rise/span ratio of arch : 1/2, length of arch culvert : 159.0 m. This arch culvert of the largest scale in Japan was structurally analyzed by FEM for multi-statically indeterminated structure with individual footing foundation. This report shows structural characteristics and constructional method of arch culvert. In order to design and construct this structure, prevention of thermal cracks in mass concrete, multi-statically indeterminated underground structure and limit state design for reinforced structure were examined.
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  • Shoppers Plaza Yokosuka
    T. Kawabe, T. Inatomi, T. Yoshino, S. Kobayakawa
    1991 Volume 29 Issue 9 Pages 38-47
    Published: September 01, 1991
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    Fujita Corporation has developed its own reinforced precast concrete system (FRPC) to facilitate site erection of reinforced concrete frames. The system has been successfully applied to more than 30 large projects. For this project, Fujita reviewed the entire FRPC system with particular attention to, (1) organization of the manufacturing method. (2) application of the FRPC system to secondary structural members, for example balconies, as well as the main structural frame. (3) quality control procedures. Manufacture of the precast members was carried out at both a permanent precast plant and at a site plant which resulted in substantial time and cost savings. This paper presents Fujita's observations on O comparative labour productivity at the two production plants. R application of the FRPC system to secondary structural members by reference to actual examples. O quality control from detailed monitoring and testing during and after manufacture and erection.
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