Concrete Journal

Highrise Reinforced Concrete Buildings -Recent Trends and Future Problems

Hiroyuki Aoyama

1986 Volume 24 Issue 5 Pages 4-13
Published: May 01, 1986
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.24.5_4

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This report focuses on the construction of highrise reinforced concrete frame-type apartment buildings, ranging from 25 to 30 stories, which recently became popular in Japan among leading construction companies. It summarizes the state-of-the-art of the structural planning in plan and elevation, sections of principal structural members, structural materials, construction planning such as use of precast concrete members, prefabrication of reinforcement cages, and splicing of reinforcing bars. It also reports on the principles of earthquake-resistant design, projected earthquake-resistant capacity, design seismic forces, selection of collapse mechanism and methods of design to realize the selected mechanism, confirmation by structural testing, and nonlinear earthquake-response analysis using lumped mass and frame models. Future problems in all of the related fields are discussed on a personal basis.

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Effects of Cracking Control on a Reinforced Concrete Structure by Using Some Kinds of Admixture

R. Tomita, S. Tanaka, F. Hondoh, K. Takenaka

1986 Volume 24 Issue 5 Pages 14-21
Published: May 01, 1986
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.24.5_14

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Four types of concrete were placed on a reinforced concrete structure, and behaviours of cracks which had occured in the structure were examined for a long time. Normal concrete with plasticizer, concrete containing shrinkage reducing agent, concrete containing both shrinkage reducing agent and expansive admixture, and superplasticized concrete were selected for this experiment. Relations between the effects of reducing drying shrinkage by using these admixtures and cracks which occured in external walls of the structure were investigated for 3 years after placing. As the results, it was found that cracks could be reduced greatly by using shrinkage reducing agent. These results are discussed on this paper.

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Construction of Large-Scale Caissons in Shirashima Oil Storage Project

Y. Ishizuka, S. Irisawa, M. Sakai, T. Gotoh

1986 Volume 24 Issue 5 Pages 22-29
Published: May 01, 1986
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.24.5_22

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The Shirashima Oil Storage Base of a floating tank type is now under construction for the first time in the world and attracts a lot of attention because of the uniqueness of its storage system. The main concrete structures in this project are breakwater caissons surrounding the base to exclude large waves from the open sea and dolphin caissons which are installed in deep water to moor the oil storage ships. This report shows the summary of the structures and the construction of these large-scale caissons; the rationalized construction method by using the slipforming method and a large floating dock are adopted in this project.

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The Constructing of Pre-Setting Tile Method by External Vivrator

K. Ichihashi, T. Shinozaki

1986 Volume 24 Issue 5 Pages 30-38
Published: May 01, 1986
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.24.5_30

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Using method of pre-setting tile on form in steel reinforced concrete (SRC) structure it is important to place concrete densely in vertical members such as columns and walls. Owing to this, superplasticizer and external vibrator as a tool of consolidating concrete were utilized in this construction works. However, external vibrator has never been used in method of pre-setting tile on form. Therefore, it was necessary to plan construction works totally taking account of selection of tile construction method, forming and placing concrete, in order to insure precision and quality of the structure. This paper mentions construction planning and items which should be investigated and examined. Furthermore, the example of improved construction method is introduced.

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Pavement on Steel Deck by Use of Steel Fiber Reinforced Concrete

H. Maeno, N. Suzuki, H. Umehara, H. Yoshida

1986 Volume 24 Issue 5 Pages 39-46
Published: May 01, 1986
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.24.5_39

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A steel deck girder was selected at Higashibetsuin Off-ramp along Branch of Nagoya Expressway 3 in view of the geographical and constructive conditions, and steel fiber reinforced concrete was used for pavement on this steel deck because the depth of concrete was only 8 cm. Placing of concrete was conducted during cold weather and superplasticized concrete conveying system by pump was used. This paper presents the details of the construction of the pavement.

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[title in Japanese]

[in Japanese]

1986 Volume 24 Issue 5 Pages 76-84
Published: May 01, 1986
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.24.5_76

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[title in Japanese]

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

1986 Volume 24 Issue 5 Pages 85-90
Published: May 01, 1986
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.24.5_85

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[title in Japanese]

[in Japanese], [in Japanese]

1986 Volume 24 Issue 5 Pages 105-120
Published: May 01, 1986
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.24.5_105

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