Concrete Journal

Application of the Distinct Element Method to Fracture Analyses of Concrete Structures

Kimiro Meguro

1993 Volume 31 Issue 5 Pages 5-17
Published: May 01, 1993
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.31.5_5

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The Extended Distinct Element Method (EDEM), which is a new method for fracture problems in the field of concrete engineering, is introduced. The EDEM can be applied to a series of behavior of materials from continuous to perfectly discontinuous state. Using the method, the development of fracture in both space and time domains can be simulated easily and automatically. The method is suited to simulate fracture behavior such as collapse, crush, slide, separation, collision etc. of media which are strongly discontinuous or heterogeneous. These behavior cannot be simulatedusing methods in which the medium is considered continuous like FEM. In this report, two types of modeling, i. e., micro-modeling to study the micro fracture mechanism of concrete and macro-modeling to investigate the fundamental vibration and fracture modes of structures, are explained by showing numerical results.

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State of the Art Report on Stay-in-place Forms for Slab

Kiyoshi Kurabayashi, Seiichi Yokosuka

1993 Volume 31 Issue 5 Pages 18-26
Published: May 01, 1993
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.31.5_18

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The shape of slab form is simpler than that of the other forms, there is much room for saving labor and time in formwork. So, many kinds of patented forms have been developed. In this paper, the present states and the problems to be solved of those are described. Matters to be attended in applying the flat deck plate form, which have been replacing by usual deck plate, are described minutely.

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Architecture White Concrete in Koriyama City Museum of Art

T. Yanagisawa, I. Saito, S. Nakane, T. Ôike

1993 Volume 31 Issue 5 Pages 27-38
Published: May 01, 1993
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.31.5_27

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In planning of Koriyama City Museum of Art, white cement concrete (hereinafter referred to as white concrete) was adopted as the architectural finish for all parts of the structure, including interior and exterior walls and columns. In each case the joints in the Japanese cedar formwork can be clearly seen in the white concrete finish. This expresses the solidity of the building while respecting both human intervention and natural influence. The client (Koriyama City) and architect (Takahiko Yanagisawa and TAK Associated Architects Inc.), as well as members of the construction company and material suppliers, formed a committee to investigate the selection of materials, the colour of the concrete, and the fabrication of the formworks. Furthermore, large scale mock-ups were built to test construction techniques and specifications, and after approval by the comittee, these were incorporated in the construction works. As results white concrete finish was completed that satisfies both the functional and aesthetic requirements of the museum.

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Construction of one of the Longest Prestressed Concrete Cable-Stayed Bridge in Japan

The Chichibu Park Bridge

N. Nakajima, Y. Azami, T. Takao, T. Yamamoto

1993 Volume 31 Issue 5 Pages 39-47
Published: May 01, 1993
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.31.5_39

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The Chichibu Park Bridge is a 2-span continuous prestressed concrete cable-stayed bridge presently under construction at the point where the access road to the Chichibu Muse Park crosses the Arakawa river (grade 1). The park is being built by the Saitama Prefectural Government as a means of stimulating the region around Chichibu. With each span measuring 195 meters (width 19 meters), the bridge is one of the longest prestressed concrete cable-stayed bridges in Japan. The bridge is being built on the same scale as a 3-span prestressed concrete bridge with a center span of 400 meters. This paper describes the methods used to rationalize and hasten the construction of the bridge and also covers the modifications necessary to make allowance for the expanding cantilever length during construction.

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Erection of Arch Bridges by Lowering Method

Motohiko Suzuki, Kazuki Nakamura

1993 Volume 31 Issue 5 Pages 48-56
Published: May 01, 1993
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.31.5_48

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The erection of the arch bridge by lowering method is more effective under environmentally severe or topographycally steep conditions. Two bridges here in Japan and abroad have been constructed by this method, and lately Tainokawa Bridge as the second bridge in Japan has been completed. Lowering systems and hinged bearings were improved because the arch span was 2 times longer and the arch half was 4 times heavier than one of the first bridge in Japan. This report summarizes the systems and method of lowering in addition to the concept and special features of lowering mainly about Tainokawa Bridge.

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[title in Japanese]

[in Japanese], [in Japanese]

1993 Volume 31 Issue 5 Pages 68-73
Published: May 01, 1993
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.31.5_68

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[title in Japanese]

[in Japanese]

1993 Volume 31 Issue 5 Pages 74-79
Published: May 01, 1993
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.31.5_74

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