Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
Volume 51, Issue 11
Displaying 1-13 of 13 articles from this issue
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  • T. Kakihara, T. Kawamoto, E. Inai, K. Minami
    2013 Volume 51 Issue 11 Pages 883-889
    Published: 2013
    Released on J-STAGE: November 01, 2014
    JOURNAL FREE ACCESS
    The authors developed a seismic retrofitting method for existing RC buildings that employs a framed steel brace system that uses post-installed anchors in a concentrated layout that can be designed for either interior or exterior application. This method is being applied primarily for the seismic retrofitting of elementary school buildings. In many instances, strengthening of buildings that employ concrete of low compressive strength (less than 13.5N/mm2) or while preserving bay windows is desired. Using an elementary school building that uses concrete of low-compressive strength as the model, this paper reports the results of horizontal loading tests on 2-bay, 2-storey frame specimens that provide reinforcement through the application of steel braces on the outside of bay windows. The results demonstrate the applicability of the proposed method for the seismic retrofit design of said building by using exterior steel framed braces with the concentrated placement of post-installed anchors.
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  • Y. Ishizeki, M. Sagara, K. Tamataki, N. Nishihira
    2013 Volume 51 Issue 11 Pages 890-897
    Published: 2013
    Released on J-STAGE: November 01, 2014
    JOURNAL FREE ACCESS
    The surfaces of concrete structures used in rivers sustain abrasion from water flow and the impact of waterborne debris such as gravel and rocks. We studied the application of ultra-high-strength fiber-reinforced concrete (UFC), which provides ultra-high strength and excellent long-term durability, to the creation of abrasion-resistant members. Abrasion tests were conducted using a steel rod-type abrasion tester to evaluate resistance to abrasion. To identify potential issues during actual construction, we conducted also simulated full-scale construction and obtained basic data on various aspects including manufacture, placement, surface finishing, and curing conditions. As a result, we confirmed that room-temperature curing UFC is suitable for the production of abrasion-resistant members.
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  • Y. Takase, T. Ikeda, Y. Yagisawa, A. Onaka
    2013 Volume 51 Issue 11 Pages 898-904
    Published: 2013
    Released on J-STAGE: November 01, 2014
    JOURNAL FREE ACCESS
    The authors have developed a new shear key for seismic retrofitting that combines a steel disk(a cylindrically shaped member used to transfer shear force by placing it at the joint surface)and anchor bolts. This joint element has a mechanism for the transfer of shear force from the existing building frame to the reinforcing members through the bearing stress between the existing concrete and the disk. The authors have demonstrated that this new shear key experimentally offers high shear strength and stiffness with a shallow embedding depth compared to ordinary post-installed anchors. This paper gives an overview of this connection method.
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