Papers - NAKAO Masato
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URAKUBO Mikiya, MIYAMOTO Mitsuhiro, UTSUNOMIYA Naoki, NAKAO Masato, OHASHI Yoshimitsu
AIJ Journal of Technology and Design 30 ( 76 ) 1257 - 1262 2024.10 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
<p>Sao-shachi joint is used for the joint at column-to-beam connections with large cross-sectional areas, providing relatively high resistance and exerting a significant impact on the overall building load-bearing capacity. Therefore, the seismic performance evaluation method for column-to-beam connections with Sao-shachi is important in designing traditional wooden buildings. This study aims to develop a formula for evaluating the bending performance of such joints based on full-scale experiments. The comparison of estimated values obtained from the proposed method with experimental results generally revealed accurate predictions of failure modes and moment and rotation angle relationships.</p>
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複数回の地震を受ける木造住宅の最大応答変位予測に関する研究
古田 智基, 中尾 方人
第16回日本地震工学シンポジウム論文集 2023.11
Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Joint Work
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URAKUBO Mikiya, MIYAMOTO Mitsuhiro, UTSUNOMIYA Naoki, NAKAO Masato, OHASHI Yoshimitsu
AIJ Journal of Technology and Design 29 ( 73 ) 1268 - 1272 2023.10 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
<p>Column-to-beam connections are important to evaluate the seismic performance of traditional wooden buildings accurately. However, there are many types of traditional joints. Some of them have not been studied for evaluating their seismic performance, such that almost no experimental data and no evaluation methods are available. This study aims to evaluate the tensile performance of column-to-beam connections with Sao-shachi joint based on the full-scale tests. It is shown that the evaluation formula for the column-to-beam connections with Yatoi-sao-shachi joint in the past is applicable to evaluate the tensile performance of these connections.</p>
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NAKAO Masato, FURUTA Tomoki
AIJ Journal of Technology and Design 29 ( 72 ) 765 - 770 2023.6 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
<p>To develop a new brace connector, static incremental analysis of a braced shear wall with a detailed analysis model was conducted. Several kinds of load-displacement relationships, that are necessary for the analysis model, were defined based on elemental tests, such as tensile tests and shear tests of the screws. The shear stiffness of the tensile brace shear wall from the analysis was higher than the one from a shear loading test, while the maximum shear strength from the analysis with the column and the brace of high density was near the one from the shear loading test.</p>
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EFFECT OF BRACE CONNECTOR SHAPE ON SEISMIC PERFORMANCE OF TENSILE BRACE SHEAR WALL
NAKAO Masato, FURUTA Tomoki
AIJ Journal of Technology and Design 28 ( 68 ) 185 - 190 2022.2 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
<p>To clarify the difference in the structural performance of the plate-type-connector, the box-type-connector, and the L-shaped-connector, the static shear loading tests of tensile brace shear walls were performed. From the tests, it was found that the plate-type-connector provides high lateral stiffness, while the structural performance of the L-shaped-connector was lower than the ones of the plate-type-connector and the box-type-connector. Regarding the relationship between the axial load of a brace and the diagonal displacement of a wood frame, the difference in initial stiffness was not detected in the specimens with 1P, 1.5P, and 2P of wall length.</p>
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在来軸組CLTフラットスラブ構法モデル住宅の構造性能
古田智基,中尾方人
西日本工業大学紀要 50 75 - 80 2022
Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Joint Work
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木造住宅軸組構法耐震要素の動的特性評価
古田智基,中尾方人
西日本工業大学紀要 50 75 - 80 2022
Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Joint Work
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在来軸組CLTフラットスラブ構法における各部の構造特性の検証
古田智基,中尾方人
西日本工業大学紀要 50 75 - 80 2020.8
Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Joint Work
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MIYAZAKI Taro, NAKAO Masato, FURUTA Tomoki
Journal of Structural and Construction Engineering (Transactions of AIJ) 84 ( 765 ) 1421 - 1431 2019.11 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
<p> A braced shear wall is an important shear resistant element in post and beam construction in Japan. Braced shear walls have better work-ability than nailed plywood shear walls and easier to install ventilation holes and piping holes. Also, it has advantages such as high wall magnification can be obtained by using in combination with plywood, it is widely used in wooden houses.</p><p> Though many studies have been done on the static structural performance of braced shear walls, it was difficult to predict the load- story displacement relationship of the braced shear wall on tensile direction. In this study, focused on the braced shear wall using L-shaped brace connectors that connect the ends of a brace and columns, which have become popular in recent years, static shear loading tests of the single-braced shear wall specimens were conducted. Variables of the specimens were the wall length, the thickness of the L-shaped brace connector, the number and the length of screws.</p><p> Then, an analysis model of the braced shear wall with the L-shaped brace connectors was proposed and static pushover analyses were conducted. The analysis result showed close to the load-displacement relationship of the experiment up to about 1/50 rad.</p><p> From the static shear loading tests and the pushover analyses, following findings were obtained.</p><p> </p><p> a) As the thickness of the L-shaped brace connector increases, the shear strength of the braced shear wall increases and the ultimate displacement decreases.</p><p> b) Effect of the number of the screws on the column on the shear strength of the braced shear wall is small in the case of 910mm of wall length. However, in the case of 1365mm and 1820mm of wall length, since a ratio of the horizontal component of the axial tensile force of the brace to the vertical component of the one increases, it affects the shear strength.</p><p> c) With long screws on the column, the maximum shear strength of the braced shear wall increases. However, there is possibilities of pulling-through the screw from the connector or splitting failure of the column. Therefore, the higher pull-out strength of the long screw may not affect the maximum strength.</p><p> d) Even if the number of screws on the brace side increases, the influence on the shear strength of the braced shear wall is small due to cracks on the end of the brace. If the cracks on the brace do not occur, the maximum shear strength of the braced shear wall is considered to increase.</p>
Other Link： https://ci.nii.ac.jp/naid/130007753071
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Shear Strength and Deformation Capacity of Mortar Finishing External Wall with Unit Wall Length
Masato NAKAO, Terusato INOUE, Kazuhiro INAGAKI, Yasunari UMEDA, Toyoshige YAMANAKA, Satoshi KONDOU, … Show more authors
Masato NAKAO, Terusato INOUE, Kazuhiro INAGAKI, Yasunari UMEDA, Toyoshige YAMANAKA, Satoshi KONDOU, Masashi MIYAMURA Hide authors
AIJ Journal of Technology and Design 24 ( 56 ) 165 - 170 2018.2 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijt/24/56/24_165/_article/-char/ja/
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Evaluation of Shear Strength of Lightweight Mortar Finishing External Wall with Opening
NAKAO Masato,ONO Yasushi,TAHARA Masaru,MIYAMURA Masashi,INOUE Terusato,KOGA Kazuya
Journal of structural and construction engineering 82 ( 733 ) 451 - 461 2017.3 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijs/82/733/82_451/_article/-char/ja/
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Structural Performance Evaluation of Traditional Wooden Framework With a Jointed Column
Kota IINUMA, Masato NAKAO
AIJ Journal of Technology and Design 21 ( 48 ) 615 - 620 2015.6 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijt/21/48/21_615/_article/-char/ja/
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EVALUATION OF EARTHQUAKE RESPONSE OF BRACED WOODEN FRAME USING BARCE FASTENER WITH RUBBER
Tomoki FURUTA, Masato NAKAO, Toshiyuki KANYAMA
AIJ Journal of Technology and Design 19 ( 42 ) 889 - 894 2013.6 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijt/19/42/19_519/_article/-char/ja/
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EVALUATION OF SHEAR STRENGTH OF TRADITIONAL WOODEN FRAME WITH HANGING AND WINDOW-BACK WALL
Masato NAKAO, Masami GOTOU, Yoshiyuki SUZUKI
AIJ Journal of Technology and Design 19 ( 42 ) 525 - 530 2013.6 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijt/19/42/19_525/_article/-char/ja/
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DEVELOPMENT OF PASSIVE DAMPER USING HIGH DAMPING RUBBER FOR WOODEN HOUSES
NAKAO Masato,YAMAGUCHI Nobuyoshi,FURUTA Tomoki,MIKOSHIBA Tadashi
AIJ journal of technology and design 18 ( 40 ) 889 - 894 2012.10 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijt/18/40/18_889/_article/-char/ja/
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NAKAO Masato,GOTO Masami,SUZUKI Yoshiyuki
AIJ Journal of structural and construction engineering 76 ( 663 ) 951 - 958 2011.5 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijs/76/663/76_663_951/_article/-char/ja/
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Estimation of Range of Maximum Shear Stress on Mud-plastered Wall Based in Material Testing of Mud
NAKAO Masato,YAMAZAKI Yutaka
Journal of Structural and Construction Engineering 75 ( 649 ) 601 - 607 2010.3 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijs/75/649/75_649_601/_article/-char/ja/
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A STUDY ON SHEAR RESISTING MECHANISM OF MUD-PLASTERED WALLS BY NUMERICAL ANALYSIS
NAKAO Masato,YAMAZAKI Yutaka
AIJ Journal of structural and construction engineering 74 ( 636 ) 331 - 338 2009.2 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijs/74/636/74_636_331/_article/-char/ja/
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NAKAO Masato,MURAKAMI Masahide,YAMAGUCHI Nobuyoshi,MIYAZAWA Kenji
AIJ Journal of structural and construction engineering 73 ( 624 ) 291 - 298 2008.2 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijs/73/624/73_624_291/_article/-char/ja/
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A Study on Shear Strength Evaluation Method for Mud-Plastered Walls
9th Canadian Conference on Earthquake Engineering No.1142 2007.6
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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NAKAO Masato,ICHIMONJI Risa,YAMAZAKI Yutaka,ISHIBASHI Yoko
Journal of Structural and Construction Engineering 70 ( 598 ) 109 - 116 2005.12 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
Other Link： https://www.jstage.jst.go.jp/article/aijs/70/598/70_KJ00004393010/_article/-char/ja/
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Experimental Study on the Evaluation of the Earthquake Resistant Performance of Mud-plastered Walls
Yu Yamazaki,Masato Nakao
13th World Conference on Earthquake Engineering 1878 2004.8
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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An Experimantal Study on Evaluating Shear Strength of Mud-Plastered Walls
Journal of Structural Engineering ( 49B ) pp.573 - 578 2003.3 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Study on Seismic Performance of an old Japanese Traditional House: Part3 Result of Dynamic Analysis
NAKAO Masato,YAMAZAKI Yutaka,NAKAJIMA Fumiko
Summaries of Technical Papers of Annual Meeting Architectural Institute of Japan 273 - 274 2002.8
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Architectural Institute of Japan Joint Work
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Shear Strength Evaluation Method for Multi-Story Precast Concrete Structural Walls
Hiroshi Imai,Tomoo Matsumoto,Masato Nakao
12th World Conference on Earth quake Engineering 2000.1
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Shear Strength Evaluation Method for Multi-Story Precast Concrete Structural Walls with Horizontal Joints on the Mortar Bedding Type
HURUTANI Masato,IMAI Hiroshi,MATSUMOTO Toshio
Proceedings of the Japan Concrete Institute 21 ( 3 ) 817 - 822 1999 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Concrete Institute Joint Work