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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.


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.,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.


Masuo K.,Supporting Association for Building Structural Technology | Maruyama T.,Jfe Holdings | Inosako T.,Jfe Holdings | Kigami T.,Jfe Holdings
AIJ Journal of Technology and Design | Year: 2016

The authors clarified ultimate strength and ductility of R/C beam using reinforcement couplers on the basis of test. However, arrangement of circular opening between upper and lower reinforcement couplers is demanded regarding architectural planning. This paper shows the design criteria for ultimate strength and ductility of R/C beams using reinforcement couplers with circular opening by test.


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.


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

The author has proposed the formulas for estimating the confining ductility of R/C square columns. However, these formulas are not applicable to rectangular columns. In this paper, estimation method of the confining ductility of such columns is clarified on the basis of past tests result of wall specimens subjected to compressive force. Also, the required transverse reinforcement for ensuring the adequate ductility is shown.


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.


Masuo K.,Supporting Association for Building Structural Technology | Doushita W.,Building Research Corporation of Japan | Mori Y.,OTANI STEEL CORPORATION
AIJ Journal of Technology and Design | Year: 2013

The authors proposed estimation formula of allowable shear strength of R/C beams in consideration of residual shear crack width. However, this formula is not applied to R/C columns. The authors conduct tests of R/C columns using 685N/mm2 shear reinforcement under comparative low axial force. Based on these tests result, the precision of estimated allowable and ultimate shear strength of R/C columns is clarified.


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.


Hosoya H.,Okumura Corporation | Kono M.,Okumura Corporation | Funayama Y.,Okumura Corporation | Masuo K.,Supporting Association for Building Structural Technology
AIJ Journal of Technology and Design | Year: 2015

Numerous reinforced concrete super high-rise buildings have recently been constructed. In order to build even higher buildings and simultaneously minimize the cross section of columns and increase the span, reinforced concrete columns using Fc150N/mm2 super high strength concrete are being developed. No adequate studies have, however, yet been made of the structural performance of reinforced concrete columns against shear failure. In this study, three types of Fc150N/mm2 reinforced concrete columns that were reinforced conventionally, with steel fiber and plate jacketing were subjected to static loading to identify structural performance and evaluate shear strength.

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