Concrete Journal

Fire Resistance of Composite Structures

Masatomo Yoshida

1995 Volume 33 Issue 12 Pages 5-14
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_5

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Composite structures have excellent structural performance, and the rationalization of their construction has been attempted, and then these structures have been applied to many buildings. But the composite structures have many problems concerning their fire resistance. This report introduces the legal regulation, the administrative measures, the test methods in order to confirm the performance, the methods of rational calculation and the examples of application etc. with regard to the fire resistance of composite structures. “The legal regulation” is composed of the actual approved methods in the Building Standard Law, the Enforcement Order and the Notification. “The fire-resistant test methods” is composed of their stories and contents. “The examples of the fire-resistant tests” deals with each composite member and the composite frames. “The examples of application” deals with the composite columns and floors. And then the actual conditions regarding the fire resistance of composite structures were introduced.

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Technical Development on Fiber Rein-forced Sidings

Hideki Yamada

1995 Volume 33 Issue 12 Pages 15-24
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_15

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According to recent marked research, fiber-reinforced-sidings have come to occupy 55% of exterior walls of detached houses. And as the external finishing material of houses, the position has been stable. As the changes of external environments such as the diversification of owner's needs, the increase of the rate of prefabrication for newly built houses and plasterer's shortage etc. advance, it is thought that the occupying rate of fiber-reinforced-sidings in a market further in-creases. In this paper, mainly I describe the outline of fiber-reinforced-sidings and the subject of their durability etc.

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Present Situation of Recent Repair and Strengthening Methods Using Resin Materials

H. Saitoh, K. Eguchi

1995 Volume 33 Issue 12 Pages 25-32
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_25

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Recently, repair and strengthening methods using resin materials for the repair and strengthening of concrete structures are drawing wide attention. Of the various methods, the CFRP Bonding Method that utilizes carbon fiber, and crack repair methods of concrete structures are introduced in this paper. The CFRP Bonding Method is used for the flexural and shear strengthening of such concrete members as slabs, girders, beams, columns and stacks. This paper describes the present situation concerning the features and performance of the materials (adhesives and strengthening materials) used in these methods.

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The Existing State of Repair Materials

Cementitious Materials

H. Matsusato, T. Okamoto, T. Kubokawa

1995 Volume 33 Issue 12 Pages 33-42
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_33

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Fundamental properties required for materials which repair deteriorated reinforced concrete structures are described. That is, physical and chemical properties of cementitious repairing materials are introduced in comparison with organic materials. General repairing methods and strengthening methods are shown, and the roles of repairing materials in such methods are denoted. Finally, the scopes which must be taken into considerations in reasonable repair designing procedures are discussed from mechanical and cement chemical aspects.

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Development of Main Bar Post Insertion System For Precast Concrete Structures

Y. Tanaka, K. Nakamura, T. Yamaguchi, J. J. Castro

1995 Volume 33 Issue 12 Pages 43-50
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_43

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A precast concrete system, where the concrete and main bar joints are located at different positions has been developed. This system is that when the precast members are cast, instead of the main bars, metallic corrugated sheaths and lapping bars are embedded at the position of main bars, with the lateral reinforcements. At the construction site the main bars are inserted and high strength mortar is grouted into the sheaths to fix the bars to the precast concrete members. The main bars are jointed at the central portion of the precast members where the stresses due to seismic actions are small, and they pass continuously at the beam-column joints. Through the lapping bars placed outside of the sheaths, the stresses are transferred from one bar to the other by bond stresses. This report presents the characteristics of the system and a summary of the experiments carried out to verify the applicability of this new system.

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Rapid Construction of Mass Concrete for the Inside structures at Kawasaki Man-Made Island on Trans-Tokyo Bay Highway

M. Kogo, M. Shimada, K. Suzuki, O. Nakagawa, K. Yokozeki

1995 Volume 33 Issue 12 Pages 51-62
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_51

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The inside structures of Kawasaki Man-Made Island on Trans-Tokyo Bay Highway were required rapid casting of large volume concrete within five months. The volume of concrete was about 130000 cubic meters, and the project consisted by slabs, side walls and diaphragms of shaft whose the diameter is 98 meters and the depth is 75 meters. Besides, several problem, for example, performance for corrosion protection against chloride attack and carbonation, the pumping capacity in the long distance of 400 meters maximum pumping length, and controlling of thermal cracking, were investigated. This paper describes the result of the pre-study for such problems and actual construction.

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Design and Construction of 2 Span Continuous Stayed Bridge which Built in Main and Diagonal P.C.Beam.

N. Ozawa, S. Yoshino, N. Kanno

1995 Volume 33 Issue 12 Pages 63-72
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_63

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It was need to build a long span bridge for the Elavated Tracks near Obihiro station, JR Nemuro line. As a result of comparative design in economical and view point, 2 span continuous stayed PC bridge was adopted any other planning. This bridge's pier (P₂) have to construct by mass concrete (about 2000 m³), because of the all load about 80% concentrated on this pier, therefore P₂ was tried to analyzes the thermo stress and crack by FEM method. So the countermeasure was taken it how to suppress thermo crack, and compared the data analysis with actual measurement. At the upper part of this bridge, Experimental construction was executed to build for diagonal PC beam.

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Execution of a Condominium Building Using The Main Bar Post Insertion Type System For Precast Concrete Structures

T. Yamaguchi, T. Nakajima, H. Iikubo, K. Hibino

1995 Volume 33 Issue 12 Pages 73-79
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_73

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This report describes the execution of an eight story condominium building. Here, most of the structural members used, were simples precast members. Specially in the longitudinal direction, a recently developed main bar post insertion type system for precast concrete structures was adopted. The main bars were inserted at the construction site and jointed through high strength mortar and lapping bars. In this system, the members were easily produced and transported. Furthermore, at the construction site better productivity and shorter construction time can be attained.

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[title in Japanese]

[in Japanese]

1995 Volume 33 Issue 12 Pages 110-116
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_110

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[title in Japanese]

1995 Volume 33 Issue 12 Pages 117-119
Published: December 01, 1995
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.33.12_117

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