NAGAI Masatsugu 長井正嗣

Researcher Number	20207971
Other IDs
External Links
Affiliation (based on the past Project Information) *help	2006 – 2007: 長岡技術科学大学, 工学部, 教授 2003 – 2004: 長岡技術科学大学, 工学部, 教授 2000 – 2001: 長岡技術科学大学, 工学部, 教授 1996: Nagaoka University of Technology, Department of Civil and Environmental Engineering, Professor, 工学部, 教授 1993 – 1996: 長岡技術科学大学, 建設系, 助教授 1992 – 1995: 長岡技術科学大学, 工学部, 助教授 1994: Nagaoka Univ.of Technology, Graduate of School of Eng., Associate Professor, 工学部, 講師
Review Section/Research Field	Principal Investigator 構造工学・地震工学 / Structural engineering/Earthquake engineering/Maintenance management engineering / 土木構造 Except Principal Investigator 構造工学・地震工学
Keywords	Principal Investigator 斜張橋 / 耐久性 / 合成桁 / ひび割れ / flutter / 耐荷力 / 吊形式橋梁 / フラッター / 座屈 / 設計法 … More / 新形式橋梁 / 疲労 / ケーブル / 長大橋 / ケーブル振動 / Limit state design method / Performance-based design method / crack width control design / studs / composite hybrid girders / double composite girders / composite girders / 連続桁 / 限界状態設計法 / 性能照査型設計法 / ひび割れ幅制御設計法 / スタッド / 合成ハイブリッド桁 / 2重合成桁 / durability / reinforcing bars / control design / stabilized crack state / initial crack st / crack / concrete / continuous composite girder / 安定ひび割れ状態 / 初期ひび割れ状態 / ひび割れ幅制御設計 / コンクリート床版 / 鉄筋 / 制御設計 / 安定ひび割れ / 初期ひび割れ / コンクリート / 連続合成桁 / reduction of cost / elasto-plastic behavior / lateral torsional buckling / ultimate strength / safety factor / cable-stayed bridges / cable supported bridges / コスト低減 / 弾塑性 / 横ねじれ座屈 / 終局強度 / 安全率 / wind / buckling / elasto-plastic finite displacement analysis / long-span bridges / spatial cable systems / cable-stayd bridges / suspension bridges / 耐風安定性 / 斜張吊橋 / 風 / 弾塑性有限変位解析 / 立体ケーブルシステム / 吊橋 / design method / simple stiffening members / slab / composite girder bridges / 2-I girder bridges / I-girder bridges / 合理化 / 少数桁橋 / 省力化 / 補剛材 / 床版 / 2主桁橋 / I桁橋 / DAMPING / DESIGN / DURABILITY / FATIGUE / CABLES / COMPOSITE GIRDERS / LONG-SPAN BRIDGES / CABLE-STAYED BRIDGES / 合成構造 / 減衰 / 設計 / 走行振動 / 連成振動 … More Except Principal Investigator 斜張橋 / Cable-Stayd Bridge / Damping / Dynamic Stability / Transmission Line / Catwalk System / Cable System / 減衰 / 動的安定性 / 送電線 / キャットウオ-ク / ケーブルシステム / Damping Analysis / Database / Modal Damping / Suspension Bridge / 減衰解析 / データベース / モード減衰 / 吊橋 / Tuned Mass Damper / Instability Phenomena / Nonlinear Analysis / Load Carrying Capacity / Cable-Stayd Bridges / 固有振動 / 振動制御 / ケーブル / 有限変位解析 / 座屈耐力 / secondary members / FEM analysis / fatigue / long life / steel girder bridge / 経済性 / 設計 / 耐久性 / 鋼橋 / 補剛システム / FEM解析 / 疲労 / 長寿命 / 橋梁 Less

Development of the most competitive performance-based limit state design method for composite girdersPrincipal Investigator
- Principal Investigator
  
  NAGAI Masatsugu
- Project Period (FY)
  2006 – 2007
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  Structural engineering/Earthquake engineering/Maintenance management engineering
- Research Institution
  Nagaoka University of Technology
New crack width control design method for continuous composite girder bridges accounting for initial crack statePrincipal Investigator
- Principal Investigator
  
  NAGAI Masatsugu
- Project Period (FY)
  2003 – 2004
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Structural engineering/Earthquake engineering/Maintenance management engineering
- Research Institution
  Nagaoka University of Technology
Identification of minimum cross-section-al dimension of main girders ensuring safety against static and dynamic instabilities in long-span cable-stayed bridgesPrincipal Investigator
- Principal Investigator
  
  NAGAI Masatsugu
- Project Period (FY)
  2000 – 2001
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  構造工学・地震工学
- Research Institution
  Nagaoka University of Technology
Developmental Study on Dynamically Stable Cable Systems
- Principal Investigator
  
  YAMAGUCHI Hiroki, 伊藤学
- Project Period (FY)
  1995 – 1996
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  構造工学・地震工学
- Research Institution
  Saitama University
Development of new system and design method for economical long-span cable-supported bridgesPrincipal Investigator
- Principal Investigator
  
  NAGAI Masatsugu
- Project Period (FY)
  1995 – 1996
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Research Field
  
  構造工学・地震工学
- Research Institution
  Nagaoka University of Technology
Fundamental Study on Analytical Evaluation of Modal Damping in Cable-supported Bridges
- Principal Investigator
  
  YAMAGUCHI Hiroki
- Project Period (FY)
  1994 – 1995
- Research Category
  
  Grant-in-Aid for General Scientific Research (B)
- Research Field
  
  構造工学・地震工学
- Research Institution
  Saitama University
Development of simple bridge system and its design methodPrincipal Investigator
- Principal Investigator
  
  NAGAI Msatsugu
- Project Period (FY)
  1994 – 1995
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  構造工学・地震工学
- Research Institution
  Nagaoka University of Technology
Formulation of design guideline for long-life steel girder bridges
- Principal Investigator
  
  FUJINO Yozo
- Project Period (FY)
  1993 – 1994
- Research Category
  
  Grant-in-Aid for Co-operative Research (A)
- Research Field
  
  構造工学・地震工学
- Research Institution
  University of Tokyo
Development of structural countermeasures against instability phenomena of long-span cable-stayd bridges
- Principal Investigator
  
  ITO Manabu
- Project Period (FY)
  1993 – 1994
- Research Category
  
  Grant-in-Aid for Developmental Scientific Research (B)
- Research Field
  
  構造工学・地震工学
- Research Institution
  Saitama University
Development of new cable-stayd systems with economy and high durabilityPrincipal Investigator
- Principal Investigator
  
  NAGAI Masatsugu
- Project Period (FY)
  1993 – 1994
- Research Category
  
  Grant-in-Aid for Developmental Scientific Research (B)
- Research Field
  
  構造工学・地震工学
- Research Institution
  Nagaoka University of Technology
斜張橋の不安定振動の発現可能性の解明に関する実験的研究Principal Investigator
- Principal Investigator
  
  長井正嗣
- Project Period (FY)
  1992
- Research Category
  
  Grant-in-Aid for General Scientific Research (C)
- Research Field
  
  土木構造
- Research Institution
  Nagaoka University of Technology

All 2007 2006 2005 2004 2003

All Journal Article Presentation

[Journal Article] Ultimate strength of composite I-girder under pure sagging bending moment2006
- Author(s)
  M.Nagai, Y.Okui, N.Inada, E.Iwasaki
- Journal Title
  
  Proceeding of 7^<th> International Conference on Short and medium Span Bridges (CD-ROM)
- Data Source
  KAKENHI-PROJECT-18360214
[Journal Article] Effect of initial bending moment in composite girder under flexure for unshored construction2006
- Author(s)
  V.K.Gupta, Y.Okui, M.Nagai
- Journal Title
  
  Proceeding of 7^<th> International Conference on Short and medium Span Bridges (CD-ROM)
- Data Source
  KAKENHI-PROJECT-18360214
[Journal Article] Development of web slenderness limits for composite I-girder accounting for initial bending moment2006
- Author(s)
  V.K.Gupta, Y.Okui, M.Nagai
- Journal Title
  
  Journal of Structural Mechanics and Earthquake Engineering Vol.62, No.4
  
  Pages: 854-864
- NAID
  10019325233
- Data Source
  KAKENHI-PROJECT-18360214
[Journal Article] Connecting force between concrete deck slab and steel girder at intermediate cross beams in composite tow-I-girder bridges2006
- Author(s)
  Y.Sasaki, A.Koyama, K.Yamada, M.Nagai
- Journal Title
  
  Proceeding of International Conference on Bridge Engineering - Challenges in the 21^<st> century (CD-ROM)
- Data Source
  KAKENHI-PROJECT-18360214
[Journal Article] Effective width formula of concrete slabs for crack with evaluation in continuous composite bridges2005
- Author(s)
  Y.Okui, T.Honda, Q.Z.Kahn, M.Nagai
- Journal Title
  
  Journal of Structural and Earthquake Engineering No.780/I-70
  
  Pages: 155-163
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-15560402
[Journal Article] 連続合成桁のひび割れ幅算定のための床版有効幅推定法の提案2005
- Author(s)
  奥井義昭, 本田卓志, Q.Z.Kahn, 長井正嗣
- Journal Title
  
  土木学会論文集 No.780/I-70
  
  Pages: 155-163
- Data Source
  KAKENHI-PROJECT-15560402
[Journal Article] 連続合成桁の初期ひび割れ状態を考慮したひび割れ幅,鉄筋応力算定法の一提案2004
- Author(s)
  長井正嗣, 奥井義昭, 岩崎英治
- Journal Title
  
  土木学会論文集 No.759/I-67
  
  Pages: 283-292
- NAID
  10012033501
- Data Source
  KAKENHI-PROJECT-15560402
[Journal Article] Evaluation of crack width of concrete slab and stress of reinforcing bar in continuous composite girder bridges2004
- Author(s)
  M.Nagai, Y.Okui, E.Iwasaki
- Journal Title
  
  Journal of Structural and Earthquake Engineering No.759/I-67
  
  Pages: 283-292
- NAID
  10012033501
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-15560402
[Journal Article] A method for crack width evaluation of continuous composite bridges accounting for shear-lag2003
- Author(s)
  Q.Z.Kahn, T.Honda, Y.Okui, M.Nagai
- Journal Title
  
  Journal of Structural and Earthquake Engineering No.738/I-64
  
  Pages: 37-47
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-15560402
[Journal Article] A method for crack width evaluation of continuous composite bridges accounting for shear-lag effect2003
- Author(s)
  Q.Z.Kahn, T.Honada, Y.Okui, M.Nagai
- Journal Title
  
  Journal of Structural and Earthquake Engineering, JSCE No.738/I-64
  
  Pages: 37-47
- Data Source
  KAKENHI-PROJECT-15560402
[Presentation] Experimental Study on Shear Strength of Lying Studs in Double-Composite Girder Bridges2007
- Author(s)
  長井正嗣
- Organizer
  7th German-Japanese Bridge Symposium
- Place of Presentation
  大阪
- Year and Date
  2007-08-01
- Data Source
  KAKENHI-PROJECT-18360214
[Presentation] Experimental study on ultimate strength of composite and double -composite girders2007
- Author(s)
  M, Nagai
- Organizer
  8th Pacific Structural Steel Conference
- Place of Presentation
  Taupo(New Zealand)
- Year and Date
  2007-03-14
- Description
  「研究成果報告書概要(欧文)」より
- Data Source
  KAKENHI-PROJECT-18360214
[Presentation] Experimental study on ultimate strength of composite and double-composite girders2007
- Author(s)
  M. Nagai
- Organizer
  8th Pacific Structural Steel Conference
- Place of Presentation
  Taupo(New Zealand)
- Year and Date
  2007-03-14
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-18360214
[Presentation] Ultimate strength of composite I-girder under pure sagging bending moment2006
- Author(s)
  M. Nagai
- Organizer
  7th International Conference on Short and Medium Span Bridges
- Place of Presentation
  Montreal(Canada)
- Year and Date
  2006-08-22
- Description
  「研究成果報告書概要(和文)」より
- Data Source
  KAKENHI-PROJECT-18360214

1. YAMAGUCHI Hiroki (50134474)

# of Collaborated Projects: 6 results

# of Collaborated Products: 0 results
2. FUJINO Yozo (20111560)

# of Collaborated Projects: 5 results

# of Collaborated Products: 0 results
3. OKUI Yoshiaki (40214051)

# of Collaborated Projects: 4 results

# of Collaborated Products: 3 results
4. ITO Manabu (00010661)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
5. SAKANO Masahiro (50143201)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
6. IWASAKI Eiji (10223380)

# of Collaborated Projects: 2 results

# of Collaborated Products: 3 results
7. SAKAI Fujikazu

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
8. KURODA Mitsunori (70221950)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
9. MORI Tsuyoshi (10157860)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
10. MIKI Chitosi (20016645)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
11. MAEDA Kenihi (60244414)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
12. SHEN Chi (10251141)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
13. NOGAMI Kuniei (00094277)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
14. IWAMOTO Masami (60232716)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
15. MARUYAMA Kyuichi (30126479)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
16. SATOH Masakatsu

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
17. CHI Shen

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results

NAGAI Masatsugu 長井 正嗣

Research Projects

Research Products

Co-Researchers

Development of the most competitive performance-based limit state design method for composite girdersPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

New crack width control design method for continuous composite girder bridges accounting for initial crack statePrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Identification of minimum cross-section-al dimension of main girders ensuring safety against static and dynamic instabilities in long-span cable-stayed bridgesPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Developmental Study on Dynamically Stable Cable Systems

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Development of new system and design method for economical long-span cable-supported bridgesPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Fundamental Study on Analytical Evaluation of Modal Damping in Cable-supported Bridges

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Development of simple bridge system and its design methodPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Formulation of design guideline for long-life steel girder bridges

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Development of structural countermeasures against instability phenomena of long-span cable-stayd bridges

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Development of new cable-stayd systems with economy and high durabilityPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

斜張橋の不安定振動の発現可能性の解明に関する実験的研究Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

[Journal Article] Ultimate strength of composite I-girder under pure sagging bending moment2006

Author(s)

Journal Title

Data Source

[Journal Article] Effect of initial bending moment in composite girder under flexure for unshored construction2006

Author(s)

Journal Title

Data Source

[Journal Article] Development of web slenderness limits for composite I-girder accounting for initial bending moment2006

Author(s)

NAGAI Masatsugu 長井正嗣