Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 54, Issue 3
Displaying 1-17 of 17 articles from this issue
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  • Maintenance, Repair, and Strengthening of Existing Concrete Structures
    Special Committee on Maintenance, Repair, and Strengthening of Existin ...
    2016 Volume 54 Issue 3 Pages 239-245
    Published: 2016
    Released on J-STAGE: March 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.3_239
    JOURNAL FREE ACCESS
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    The Japan Concrete Institute established the “Special Committee on Maintenance, Repair, and Strengthening of Existing Concrete Structures (chaired by Professor Toyoaki Miyagawa, Kyoto University)” in May 2013, to analyze the current state of the techniques and their levels, from the viewpoints of basic strategies for maintenance, checking/evaluation, maintenance/repair/strengthening, lifespan prediction and life cycle management, and to debate about future direction. This article explains the outline of the activities of the committee.
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  • Performance Verification by Finite Element Analysis Based on Standard Specifications for Concrete Structures of Japan Society of Civil Engineers
    S. Saito, T. Maki, S. Tsuchiya, T. Watanabe
    2016 Volume 54 Issue 3 Pages 246-252
    Published: 2016
    Released on J-STAGE: March 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.3_246
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    Amid expectations for the application of nonlinear finite element analysis to performance verification of concrete structures, the 2012 edition of the “Design” volume of the Standard Specifications for Concrete Structures includes a section on “Verification by Nonlinear Finite Element Analysis”. Conventionally, the application of finite element analysis to performance verification has been done within the framework of traditional performance verification by replacing the stress and strain obtained from the analysis with sectional forces and deformation, but this approach did not allow full utilization of the results of nonlinear finite element analysis as it does not directly make use of detailed information on local material damage. In this regard, the 2012 edition introduces generic verification indices that use strain and stress, allowing performance verification of structures based on material damage. This paper explains the basic concept of the performance verification method using nonlinear finite element analysis as defined by the Japan Society of Civil Engineers, and introduces assessment cases of concrete structures using material damage indices.
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  • Scenario Selection by Risk-based Safety Evaluation of Concrete Structures in Low-Level Radioactive Waste Disposal Facilities
    Y. Tsuji, M. Hironaga, K. Niwase
    2016 Volume 54 Issue 3 Pages 253-259
    Published: 2016
    Released on J-STAGE: March 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.3_253
    JOURNAL FREE ACCESS
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    Risk-based safety evaluation of concrete structures that encompasses their planning, design, construction and maintenance is expected to become a strong imperative. This paper describes safety evaluation predicated on a risk-based approach in connection with scenario selection, focusing on concrete structures at low-level radioactive waste disposal facilities. This scenario selection, which is based on the safety evaluation method predicated on the risk-based approach established by the Nuclear Safety Commission in the year before the Great East Japan Earthquake, is believed to be applicable to the safety, reliability and maintenance management of general concrete structures based on a risk-based approach, an area in need of urgent study.
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  • A Study of Methods to Evaluate the Durability of Post-Installed Bonded Anchors
    S. Iguchi
    2016 Volume 54 Issue 3 Pages 260-267
    Published: 2016
    Released on J-STAGE: March 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.3_260
    JOURNAL FREE ACCESS
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    Since an accident involving the collapse of ceiling slabs in the Central Nippon Expressway Sasago Tunnel, the method used to verify the durability performance of post-installed bonded anchors has been an issue. Metallic anchors are the main type of anchors used for road applications, whereas bonded anchors are often used for railway applications based on consideration of the effect of the vibrations caused by train traffic. Although the US and Europe have some standards for bonded anchor durability evaluation methods, a significant amount of data regarding test methods and test results has not been made public. In this context, the author conducted an investigation of Western test methods related to the alkali resistance and creep properties of post-installed bonded anchor. This investigation revealed that while differences among test methods affect test results, a certain degree of assessment is possible.
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  • Demonstration Experiment of Instantaneous Seismic Capacity Evaluation Method Using Accelerometers at University Research Building
    Y. Hibino, K. Kusunoki, M. Teshigawara, M. Araki
    2016 Volume 54 Issue 3 Pages 268-274
    Published: 2016
    Released on J-STAGE: March 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.3_268
    JOURNAL FREE ACCESS
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    Health monitoring technology has been attracting attention in recent years as a method to evaluate the seismic performance of buildings. This paper introduces a demonstration experiment of an instantaneous seismic capacity evaluation method using accelerometers carried out on a steel reinforced concrete building of the Faculty of Engineering at Hiroshima University. The proposed seismic performance evaluation method was verified by calculating the capacity curve of the building based on the acceleration history of a building during earthquakes as measured by accelerometers, and comparing it with the demand curve obtained from the foundation input acceleration and acceleration records obtained at nearby strong motion observation points. The validity of this evaluation method was demonstrated through comparison of the natural period obtained from the transfer function and the skeleton curve of the capacity curve, and the relationship diagram of the capacity curve and demand curve.
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  • Testing and Behavior of Post-installed Anchors in Sustained Tensile Load
    K. Aoki, H. Nishida, T. Hanajima, M. Takahashi
    2016 Volume 54 Issue 3 Pages 275-281
    Published: 2016
    Released on J-STAGE: March 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.3_275
    JOURNAL FREE ACCESS
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    Testing and behavior of post-installed anchors in sustained tensile load is to verify the mount of pull-out (displacement) and tensile resistance when the tensile load is applied to post-installed anchor for long-term. Such testing method is not a standardization yet in Japan. In this case, the test is organized according to European Technical Approval Guideline (ETAG) and investigated at Garman independent test laboratory (KIWA). This paper delineates the testing process and the behavior of sustained tensile load.
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  • An Estimation Method of Flexural Crack Behaviors Using 3 Reinforced and Chemically Prestressed Concrete Beams
    K. Suhara, Y. Tsuji
    2016 Volume 54 Issue 3 Pages 282-289
    Published: 2016
    Released on J-STAGE: March 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.3_282
    JOURNAL FREE ACCESS
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    Three specimens each of reinforced concrete beams made using either ordinary concrete or expansive concrete were prepared, each with a different effective height and mix proportion, all for the same test factor and level. The occurrence of flexural cracks of each beam under testing was recorded, and the test results were compiled, taking into account variations. Further, methods for the calculation of the stress-strain curve and ultimate tensile strain of the concrete lowest fiber under flexural tensile stress were presented, and from the reinforced concrete beam measurement results, the tensile characteristics of concrete were compared with the identified results. As a result, ultimate tensile strain of expansive concrete with large expansion energy was confirmed to be generally greater than that of ordinary concrete.
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