Concrete Journal

The Summary of “The Standard for Design and Construction about PC Tank with the Water Reservoir”

H. Yokoyama

2006 Volume 44 Issue 4 Pages 3-10
Published: April 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.4_3

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“The Standard for design and construction about prestressed concrete tank with the water reservoir” was published by Japan Prestressed Concrete Engineering Association in December, 2005. In this paper, the scope for application, the requirements of performance, the seismic performance, the analysis, the durability, design for the foundation, and the manual for design and consutruction about this standard, are explained after the characteristics of PC tanks are mentioned.

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The Design and Construction of Underground Water Tank using Prestressed Precast Concrete

T. Furumura, Y. Nakayama, T. Kanto, S. Yamanaka

2006 Volume 44 Issue 4 Pages 11-18
Published: April 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.4_11

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The authors developed an underground water tank of precast concrete for avoiding floods by rain water outflowing. This water tank have few features : roof constructed with prestressed concrete, and each columns' span of 10 meters that is more than twice as long as a water tank constructed with usual reinforced concrete. Therefore, long span of each columns enables to build an economical and efficient institution. Long span of each columns and flat bottom slab enable to maintain an institution easily, and to clean by heavy industrial machines. Moreover, precast concrete method of construction enable to shorten terms of works on building site. The authors developed a pin joint method for junction of precast concrete members which bears an earthquake of level 2, and examined its method performance by an actual size experiment.

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Evaluation System for Earthquake Resistant Performance of Reinforced Concrete Buildings

K. Sugimoto, K. Tsuda, K. Ichikawa, T. Kawabata

2006 Volume 44 Issue 4 Pages 19-25
Published: April 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.4_19

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This paper describes about a performance evaluation system for earthquake resistant RC structures. The system was developed by adding a damage evaluation process to the nonlinear frame analysis program “DREAM-3D”, and the analytical results were applicable showing damage extension on post program. Crack width is used as an index of damage. The analysis with the system calculates the crack width of each member. Experiments were executed to verify the proposed process. The calculation results corresponded well with the experimental ones. Additionally, frame analysis was executed for an existing 5 story building using the system, and damage extension was clearly visible.

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Application of Near-infrared Spectral Imaging for Componential Analysis of Concrete

H. Kanada, Y. Ishikawa, T. Uomoto

2006 Volume 44 Issue 4 Pages 26-32
Published: April 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.4_26

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Recently, the authors have developed a new non-destructive inspection method for concrete structures using near-infrared [NIR] spectroscopic technique. Since typical spectrometer can measure only spectral information of one point, a new near-infrared spectral imaging system was assembled to scan a large area using equipment already available. Clear spectral images can be captured due to improvement of performance. This enables us to scan distribution or concentration of deleterious substances two-dimensionally. Availability of this system for inspection of deteriorated concrete has been corroborated by experimental results. This paper describes how to obtain distribution of deleterious substances of concrete from spectral image, and introduces test results.

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Prediction of Initial Cracking in Concrete Structures and Development of Membrane Curing Agent

T. Toyofuku, M. Shiosaki

2006 Volume 44 Issue 4 Pages 33-42
Published: April 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.4_33

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Initial cracking arise in the restraint of concrete structures (such as main garder against the deck slabs, for example) warping originated from the drying shrinkage and temperature change. And the passing-through crack arise before use of structures in certain circumstance, it bring on public discussion. Therefore this study clarified the cause of initial cracking. It was confirmed that the weather conditions (wind speed, humidity, temperature) caused this cracking, and this cracking is controlled by the membrane curing agent. Using the wind tunnel equipment, this study clarified the prediction of initial cracking in the domain of weather conditions.

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[title in Japanese]

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

2006 Volume 44 Issue 4 Pages 44-50
Published: April 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.4_44

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[title in Japanese]

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

2006 Volume 44 Issue 4 Pages 51-58
Published: April 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.4_51

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[title in Japanese]

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

2006 Volume 44 Issue 4 Pages 59-64
Published: April 01, 2006
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.44.4_59

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