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Tagawa H.,General Building Research Corporation of Japan | Hiramatsu M.,Taisei Corporation | Masuo K.,Supporting Association for Building Structural Technology | Kubota T.,Kinki University
Journal of Structural and Construction Engineering | Year: 2011

In the precast-wall RC structures, thecotter-bars installedinthe joints have been flare-welded. However, in terms of theassurance of the qualityat construction cite, non-weldingmethodis preferable for the connectionof cotter-bars. In thisresearch,in order to develop non-welding method, staticloading tests are carried out for the total of 17 specimens with I-, T-, L-shapedvertical and horizontal joints utilizing clip-type splices as well as flare-welding. Each specimen has practicalconfigurationofshear-cotters. Major findings include: (1) vertical joints utilizingclip-type splicesexhibitthe ultimate strength similarto thoseutilizing flare-welding, and (2)T-andL-shaped verticaljointsexhibit approximately 0.8 times ultimatestrength of I-shapedverticaljoints due to the inclinationoftheangles of concrete compression strutsdeveloped in in-plane and out-of-plane walls. Source


Masuo K.,Supporting Association for Building Structural Technology | Doushita W.,General Building Research Corporation of Japan | Adachi M.,General Building Research Corporation of Japan
AIJ Journal of Technology and Design | Year: 2014

Wide width beams are frequently designed in R/C moment resisting frame. Using mechanical anchorage for such beam reinforcements, development strength of a part which is not able to anchor in column section may be deteriorated. In order to solve this problem, the authors proposed new reinforcement detailing. In this study, R/C L-shaped joint connected with wide width beam using mechanical anchorage is tested. Consequently, the authors clarify ultimate strength and beam end ductility of these L-shaped joints. Source


Masuo K.,Supporting Association for Building Structural Technology | Doushita W.,General Building Research Corporation of Japan | Adachi M.,General Building Research Corporation of Japan
AIJ Journal of Technology and Design | Year: 2014

Effective utilization of 590N/mm2 class high-strength reinforcement is able to reduce number of footing beam reinforcements. However its validity is not verified by experiment. In this study, R/C L-shaped joint using 590 N/mm2 class high-strength reinforcement and mechanical anchorage is tested. Consequently, the authors clarified that the proposed design formula can be applied for estimation ultimate strength of such joint as well as using normal-strength reinforcement. Source


Hosoya H.,Okumura Corporation | Funayama Y.,Okumura Corporation | Kono M.,Okumura Corporation | Masuo K.,Supporting Association for Building Structural Technology
AIJ Journal of Technology and Design | Year: 2013

Recent super high-rise buildings adopt Fc100 N/mm2 class concrete columns. High-strength concrete columns of Fc150 N/mm2 class are also under development. However, existing studies have identified no sufficient structural properties of high strength columns, so we conducted loading tests to identify such properties. The tests revealed that strength and ductility were 10 to 15 % and 20 to 30 % higher, respectively in reinforced concrete columns with steel fiber jacketing or steel plates jacketing than in conventional columns, and could secure marginal drift angle of R=1/25 rad or higher under high axial forces with 0.5 axial force ratio. Source


Masuo K.,Supporting Association for Building Structural Technology
AIJ Journal of Technology and Design | Year: 2013

Recently, ultimate strength of r/c interior beam-column joints with floor level difference using mechanical anchorages has been researched. However, design method of such joints is not necessarily clear. This paper shows its design criteria and mechanism based on past tests result. Consequently, estimation method of design ultimate strength of such joints is clarified. Source

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