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Hirashima T.,Chiba University | Okuwaki K.,Kajima Corporation | Zhao X.,University of Tokyo | Sagami Y.,General Building Research Corporation | Toyoda K.,General Building Research Corporation
Journal of Structural and Construction Engineering | Year: 2014

This paper discusses, on the basis of experimental results, structural fire behaviour of a rigid steel frame with fully-moment-resisting beam-to-beam connections with splice plates and high strength bolts, and beam-to-column connections with full penetration welds. The test results indicated that the moment-resisting connections in the rigid steel frame have sufficient load-carrying capacity but failure may occur in the connected beam due to inadequate shear resistance of the beam web in fire. The critical temperature of the steel beam could be approximated on the basis of its inherent resistance at elevated temperature and initial effects, because the thermal stress disappeared at the fire limit stage. In this study, the safety factor of structural fire safety design was also discussed on the basis of the result of these load-bearing fire tests.


Kominami K.,General Building Research Corporation | Takachi S.,P.A.C. Environment Mode Co. | Kobayakawa K.,General Building Research Corporation
Journal of Environmental Engineering | Year: 2010

Based on the knowledge that is acquired through basic experiment, the authors made full-scaled oil-interceptor and used conventional gasoline engine oil to conduct experiment. As a result, it is proved that to make oil-interceptor which can maintain retention efficiency to fulfill effluent standard of sewerage is feasible. Besides, the authors made consideration regarding performance test method of oil-interceptor based on this result of the experiment.


Kikitsu H.,Japan National Institute for Land and Infrastructure Management | Yoshida A.,Tokyo Polytechnic University | Maeda Y.,General Building Research Corporation | Nishimura H.,General Building Research Corporation | Okada H.,Japan Housing and Wood Technology Center
AIJ Journal of Technology and Design | Year: 2012

The methods of structural test and evaluation applicable to steel wall system were developed in order to verify wind-resistant performance of the system. They were incorporated in the Standard of Steel Wall (SSW2011). The authors developed the methods in the viewpoint of performance-based structural design so that the concept of structural verification using them follows Building Standard Law of Japan. This paper outlines the detail of the proposed methods along with technical backgrounds.


Masuo K.,Supporting Association for Building Structural Technology | Doushita W.,General Building Research Corporation | Adachi M.,General Building Research Corporation | Tagawa H.,Hyogo Earthquake Engineering Research Center
Journal of Structural and Construction Engineering | Year: 2014

The reinforcement detailing in L-shaped R/C beam-column joints at the roof-level is important for rationalization of design and construction of moment-resisting frame. In order to solve this problem, the authors proposed new reinforcement detailing using mechanical external anchorage of column reinforcement. Through this detailing, anchorage region is small enough to be hidden in the water-proof layer. In this study, such L-shaped R/C beam-column joints are tested. The experimental data shows that these joints have larger deformation capacity than with conventional anchorage. This is due to the formation of the strut mechanism in the joint. Consequently, the authors clarify that the proposed design formula can be applied for estimation of ultimate strength of these joints on the basis of experimental results.


Masuo K.,Building Structural Technology | Tagawa H.,General Building Research Corporation | Ichioka Y.,General Building Research Corporation | Adachi M.,General Building Research Corporation
Journal of Structural and Construction Engineering | Year: 2013

In recent years, composite joints consisting of Steel-Beam and RC-Column or Steel-Beam and SRC-Column are applied to large-scaled moment-resisting frame structures. However, the adequacy of anchorage detail of column reinforcement is not clear due to the lack of experimental data. Also, in accordance with the increase of reinforcement size, mechanical anchorage is more often applied to RC and SRC beam-column joints. In this study, based on experimental data on 9 specimens of L-shaped joint consisting of Steel-Beam and RC-Colmnn or Steel-Beam and SRC-Column utilizing mechanical anchorage, design criteria on ultimate strength of such composite beam-column joints and anchorage length of column reinforcement are discussed.


Ozawa H.,Waseda University | Hasemi Y.,Waseda University | Yasui N.,Waseda University | Tamura Y.,Kansai Association for the Research in Traditional Housings | And 3 more authors.
AIJ Journal of Technology and Design | Year: 2012

The clay wall, unapproved as a fire-protective material in Building Standard Low, has a problem of the building confirmation. Therefore, clay wall is required to be analyzed on its fire-protective performance. Since clay contains a certain amount of organic substances, it has a probability of combustion and heat releasing. This paper reports the fireprotective ability of wall clay, examining through the cone calorimeter and the gas toxicity, utilized as a means of the approval tests for fireprotective material have been carried out. As a result, the wall clay, even enriched straw, proved that it has a performance of noncombustible matter.


Nishimura H.,General Building Research Corporation | Kawai H.,Kyoto University
Journal of Wind Engineering | Year: 2010

A pair of conical vortices formed on a flat roof of a low-rise building, when an approaching flow attacks to the building with an oblique angle, randomly exchanges their strength to each other. The phenomenon is called as the 'Switching of conical vortices' When a splitter plate was set on the roof to prevent the direct interference between conical vortices on the roof, the switching phenomenon still appeared clearly, while a splitter plate set in the wake of the model eliminated the occurrence of the switching of conical vortices on the roof. These findings considerably justify the idea that the switching of conical vortices on a roof, which were connected to vortices in the wake of the model, can be drawn from the interference between vortices in the wake.


Maruyama Prof. T.,Kyoto University | Kawai H.,Tokyo Denki University | Nishimura H.,General Building Research Corporation | Hanatani M.,Kyoto University
Journal of Wind Engineering | Year: 2014

Even though the importance of protecting windows from windborne debris under strong winds, there are still no available building codes or standards for their protection to building cladding in Japan. By contrast, some specifications for cladding performance under impact from windborne debris, including testing methods, exist in some foreign country and ISO standards. It is necessary to investigate the impact performance for roof tiles, representative windborne debris in Japan, in order to make domestic codes or standards. We made a new designed air cannon which can propel not only steel balls and a lumber but also a roof tile as missile. A series of impact tests based on ISO 16932 was conducted on laminated glasses by various missiles. This paper described the results of the impact performance and proposed standard missiles those include a lumber missile with equivalent destructive power to roof tiles.


Sakaguchi A.,General Building Research Corporation | Toyoda K.,General Building Research Corporation | Kadooka N.,General Building Research Corporation | Tasaka S.,General Building Research Corporation
Journal of Structural and Construction Engineering | Year: 2013

The Rockwell hardness of high-strength bolt sets subjected to high temperature was measured. According to these data, the equation that Rockwell hardness decreased at 7HRC per 100°C above the tempering temperature was proposed as a conservative simple estimation method for fire-damaged investigation. The temperature of high-strength bolt sets was decided by averaging three temperatures, which estimated by applying the proposed equation to bolt, nut and washer. The proposed method was applied to the fire resistance test on full-scale beam and the measured temperatures of bolt sets could be estimated with adequate accuracy.


Ichioka Y.,General Building Research Corporation | Tagawa H.,General Building Research Corporation | Adachi M.,General Building Research Corporation | Masuo K.,General Building Research Corporation
Journal of Structural and Construction Engineering | Year: 2011

Allowable shear strength for repair-control was specified in A[J Standard for Structural Calculation of Reinforced Concrete Structures revised in 2010. However, this allowable strength was deified by limited data Lmd past research indicated that in some specimens no shear crack was initiated at allowable strength. The authors conduct Lmti-syn]metric bending tests of R/C beams using SD295 to 785 N/mm2 tnmsverse reinforcement. It is confirmed that specimens with smail tnmsverse reinforcement ratio have frequently no shear crack at allowable strength. Finally, modified allowable shear strength aceointing for tramverse reinforcement ratio is proposed Lmd verified to satisfSj residual shear crack width hmitatiun.

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