Concrete Journal

Fireproof Techniques for Tunnel Structures

T. Otsuka, T. Takimoto

2004 Volume 42 Issue 8 Pages 3-8
Published: August 01, 2004
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.42.8_3

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The fireproof techniques for tunnel structures are studied and developed by many Engineers and it will be completed. In this paper, the fireproof design methods and protection methods are introduced. In the near future, the fire curve, performance of fire protection, specifications for fire protection will be established by these results in Japan.

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Keynote of the Model Code for Design of Concrete Railway Structures

T. Sato, Y. Tanimura, M. Sogabe, S. Tottori

2004 Volume 42 Issue 8 Pages 9-13
Published: August 01, 2004
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.42.8_9

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The Model Code for Design of Concrete Railway Structures (Draft), which is a revised edition of the Code-1992, has been established by wholly adopting the Structural Performance Verification Design Method. This design code can be applied not only to the structures of JR but also to those of other railway companies. This paper describes the summary of the new code.

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Damage Estimation of Reinforced Concrete Interior Beam-column Joints by Applying Fractal Geometry

M. Teraoka, K. Hayashi, S. Sasaki, N. Takamori

2004 Volume 42 Issue 8 Pages 14-21
Published: August 01, 2004
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.42.8_14

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The purpose of this study is to estimate the damage of interior beam-column joints subjected to an earthquake loading, which brings to establish performance-based seismic design for reinforced concrete frames and diagnosis methods of damaged reinforced concrete buildings by earthquake. Concretely, by using many test data for interior beam-and-column subassemblages tested by authors, estimations of restoring force characteristics on relationships between shear forces and shear distortions of joint panels, of relationships between shear distortions and shear crack widths, and of damaged levels of shear cracks and compressive failure by applying fractal dimension analysis, are carried out. Further, based on the results of this studies and on our previous works for estimation methods of structural performances on beams, columns, and subassemblages, damage estimation methods at structural design and at diagnosis for buildings damaged by earthquake, are proposed.

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Properties of Fresh and Hardened Concretes using Crushed-stone Powder

Y. Tsuji, A. Shimizu, K. Mano, M. Hisaka

2004 Volume 42 Issue 8 Pages 22-29
Published: August 01, 2004
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.42.8_22

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Crushed-stone powder is limited to what passes through a 75 micrometer sieve in which the by-product is separated by dry process at the time of manufacture of a crushed stone and/or a crushed sand. Such crushed-stone powder can be used for the purpose of increasing the material's separation resistance of concrete. The cause of the limitation as mentioned above is that the indication of the fine powder which passes through a 75-micrometer sieve can lessen a unit content of water from the examination results of mortar and concrete. Higher compressive strength and lower carbonation can be gained when used crushed-stone powder in place of fine aggregate. Drying shrinkage and frost damage of concrete are both almost same if fine aggregate is replaced by crushed-stone powder.
The quality of specified crushed-stone powder was proposed in a table and the TR A 0015 based on the proposal was published at 2002.

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Development of a Long Span Prestressed Concrete Bridge using Ultra High Strength Fiber Reinforced Concrete

Y. Tanaka, H. Musya, K. Ooshima, Y. Abe

2004 Volume 42 Issue 8 Pages 30-36
Published: August 01, 2004
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.42.8_30

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As a new generation material RPC (Reactive Powder Concrete) has high strength property, high durability as well as good consistency, the prestressed concrete bridge applied by this material makes it possible to reduce the self dead weight to 1/4-1/5 compared with the usual PC bridge using normal concrete. In this paper, a new construction method which enables to make a long span bridge with short construction periods as well as low cost, is reported considering the assembling U-shaped pre-cast concrete girders and pre-cast concrete slabs. Some new technologies are applied for not only producing the U-shaped girders and slabs but also the jointing those pre-cast blocks. Through the verification experiments, “Akakura Onsen Yukemuri Footbridge” with a 35. 3 m span, 3. 5 m width and 0. 95 m height, has been constructed to confirm those technologies.

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese]

2004 Volume 42 Issue 8 Pages 38-43
Published: August 01, 2004
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.42.8_38

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

2004 Volume 42 Issue 8 Pages 44-49
Published: August 01, 2004
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.42.8_44

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