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Experimental and analytical studies on reinforcement effects of FRP-strengthened externally structures with FRP pre-tension

Research Project

Project/Area Number 11650461
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 土木材料・力学一般
Research InstitutionIbaraki University

Principal Investigator

WU Zhishen  Ibaraki Univ.Fac.of Engineering, Associate Professor, 工学部, 助教授 (00223438)

Co-Investigator(Kenkyū-buntansha) FUKUZAWA Kimio  Ibaraki Univ.Fac.of Engineering, Professor, 工学部, 教授 (50165271)
HARADA Takao  Ibaraki Univ.Fac.of Engineering, Research Associate, 工学部, 助手 (00241745)
YOKOYAMA Koichi  Ibaraki Univ.Fac.of Engineering, Professor, 工学部, 教授 (20302325)
NUMAO Tatsuya  Ibaraki Univ.Fac.of Engineering, Associate Professor, 工学部, 助教授 (90164649)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsFiber reinforced polymer (FRP) sheets / Prestressing and bonding / Concrete structures / flexural strengthening / Debonding / Fracture mechanics / Finite Element Method / Performance verification
Research Abstract

1) Experimental investigation on reinforcement effects of pre-tensioned FRP sheets : An experimental program was carried out to verify quantitatively the reinforcement effects on load-carrying capacity (ultimate strength), stiffness characteristics and resistance of crack opening, and the improvements on yield load of rebars, vibration mitigation effect and ductility behavior, of FRP-strengthened concrete and reinforced concrete beams through FRP pre-tension. The main parameters were the concrete compressive strength, the number and the types of FRP sheets, treatment methods of bonding surface and the pre-stress level. Moreover, the reinforcement effects of specimens with different existing damages due to pre-loading were also investigated. Through this test program, it was confirmed that the efficiency of the existing FRP bond technique could be improved greatly through FRP prestressing. On the other hand, as an appropriate reinforcement, the effectiveness of PBO fiber sheets with hig … More her energy absorption is also verified for future practical use.
2) Anchorage treatment of pre-tensioned FRP sheets externally bonded : To avoid the debonding failure near the ends upon releasing the pre-tensioned force, the anchorage zone are dealt with by several proposed reinforcing methods such as bonding with U type or flat extra FRP sheets, anchorage with anchor bolts, and the effects of these anchorage treatments were also discussed. Besides, a stress reduction strategy for the shear stress concentration with a layer lag around anchorage zone is proposed. Except the theoretical analysis, experimental investigation was also used to verify the effectiveness elementarily.
3) Bonding and debonding mechanism of externally bonded FRP sheets : First of all, the different types of debonding failure modes were identified through the existing and newly carrying out experimental results. Then, due to the brittle behavior of interfacial fracture, the fracture mechanics based theoretical and numerical methods were developed for analyzing and evaluating the FRP-strengthened structures with or without FRP pre-tension. Moreover, an experimental program was also performed to identify the constitutive model of local shear stress-shear displacement relationship.
4) Creep and stress relaxation behavior of FRP sheets and FRP-strengthened structures : Through experimental investigation, the creep and stress relaxation behavior of carbon and PBO fiber reinforced polymer sheets up to 1000 hrs has been grasped. Moreover, the creep and stress relaxation behavior of FRP-strengthened concrete beams was also investigated within a short-term up to a couple of month.
5) Performance verification of FRP-strengthened structures with FRP pre-tension : Through the investigation of different failure modes of FRP-strengthened structures, such as rebar yielding-FRP rupture, rebar yielding-concrete crushing, concrete crushing without both FRP rupture and rebar yielding, shear failure and debonding failure, first of all, the applicability of traditional RC theories were verified. Then, a rational design approach based on fracture mechanics for predicting the deformational and ultimate load due to debonding fracture was proposed. Besides, an effort was also made to investigate the determination of appropriate prestressing stress level of FRP sheets and structural optimization of reinforcement. Less

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (48 results)

All Other

All Publications (48 results)

  • [Publications] Yuan,H.,Wu,Z.S.and Yoshizawa,H.: "Theoretical solutions on interfacial stress transfer of externally bonded steel/composite laminates"Journal of Structural Mechanics and Earthquake Engineering,JSCE. (登載決定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Niu,H.D.and Wu,Z.S.: "Interfacial debonding mechanism influenced by flexural cracks in FRP-strengthened beams"Journal of Structural Engineering. Vol.47A. 1277-1288 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yin,J.and Wu,Z.S.: "FE Analysis on Interaction Between Interfacial and flexural Cracking Behaviors of FRP-Strengthened Concrete Beams"The Fourth Japan-China Joint Conference on Composites. 12-15 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Iwashita,K.and Wu,Z.S: "Strengthening Method for Reinforced Concrete Flexural Structures with Externally Prestressed PBO Sheets"The Fourth Japan-China Joint Conference on Composites. 22-25 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Niu,H.and Wu,Z.S.: "Proposed Design Guideline for Debonding Failure of FRP-strengthened Flexural Members"The Fourth Japan-China Joint Conference on Composites. 26-31 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 吉澤弘之,呉智深,袁鴻,金久保利之: "連続繊維シートとコンクリートの付着挙動に関する検討"土木学会論文集. No.662/V-49. 105-119 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Wu,Z.S.,and Niu,H.: "Shear Transfer Along FRP-Concerte Interface in Flexural Members"Journal of Materials,Concrete Structures and Pavement,JSCE. No.662/V-49. 231-245 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 高橋貴蔵,呉智深,堀内辰夫: "光ファイバセンサによるFRP板-コンクリート接着界面の界面剥離モニタリングに関する研究"第55回年次学術講演会講演概要集. V-463. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 岩下健太郎,呉智深,林啓司,樋口哲郎,村上信吉: "PBO連続繊維シート緊張接着によるRC曲げ部材の補強法に関する研究"第55回年次学術講演会講演概要集. V-389. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 呉智深,黒川徹二,吉澤弘之,平畑裕嗣: "梁部材におけるFRP面状補強材の界面接着・剥離メカニズムに関する研究"構造工学論文集. Vol.46A. 1469-1478 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Wu,Z.S.and Niu,H.D.: "Debonding Failure Load of RC Beams Strengthened With FRP Sheets"Journal of Structural Engineering,JSCE. Vol.46A. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Wu,Z.S.,Matsuzaki,T.,Yokoyama K.and Kanda T.: "Retrofitting Method for RC Structures with Externally Prostressed Carbon Fiber Sheets"Proceedings of the 4th Int.Symp.FRPRCS,ACI International. SP-188-65. 751-765 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yoshizawa,H.and Wu,Z.S.: "Crack behavior of Plain Concrete and RC members Strengthened with Carbon Fiber Sheets"Proceedings of the 4th Int.Symp.FRPRCS,ACI International. SP-188-66. 767-779 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yin,J.and Wu,Z.S: "Interface Crack Propagation in FRP Strengthened Concrete Structures using Nonlinear Fracture Mechanics"Proceedings of the 4th Int.Symp.FRPRCS,ACI International. SP-188-87. 1035-1047 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 冨岡龍一,呉智深,横山功一,許斌: "FRPシート緊張接着補強による振動の低減効果に関する研究"土木学会第54回年次学術講演会講演概要集. V-376. 752-753 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 牛赫東,呉智深,朝倉俊弘: "A Numerical Analysis on Bonding Mechanism of FRP-strengthened Concrete Structures Using Nonlinear Fracture Mechanics"コンクリート工学年次論文報告集. Vol.21,No.3. 73-78 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yuan, H., Wu, Z.S.and Yoshizawa, H.: "Theoretical solutions on interfacial stress transfer of externally bonded steel/composite laminates"Journal of Structural Mechanics and Earthquake Engineering, JSCE. (Now Printing). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Niu.H.D.and Wu.Z.S.: "Interfacial debonding mechanism influenced by flexural cracks in FRP-strengthened beams"Journal of Structural Engineering. Vol. 47A. 1277-1288 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yin, J.and Wu, Z.S.: "FE Analysis on Interaction Between Interfacial and flexural Cracking Behaviors of FRP-Strengthened Concrete Beams"The Fourth Japan-China Joint Conference on Composites. 12-15 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Iwashita, K.and Wu, Z.S.: "Strengthening Method for Reinforced Concrete Flexural Structures with Externally Prestressed PBO Sheets"The Fourth Japan-China Joint Conference on Composites. 22-25 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Niu, H.and Wu, Z.S.: "Proposed Design Guideline for Debonding Failure of FRP-strengthened Flexural Members"The Fourth Japan-China Joint Conference on Composites. 26-31 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yoshizawa, H., Wu, Z.S., Yuan, H.and Kanakubo, T.: "Study on FRP-Concerte Interface Bond Performance"Journal of Materials, Concrete Structures and Pavement, JSCE. No. 662/V-49. 105-119 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Wu, Z.S., and Niu, H.: "Shear Transfer Along FRP-Concerte Interface in Flexural Members"Journal of Materials, Concrete Structures and Pavement, JSCE. No. 662/V-49. 231-245 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Takahashi, T., Wu, Z.S.and Horiuchi, T.: "Monitoring on FRP-concrete interfacial debonding using continuous optical fiber sensor'"Proceedings of the 55th Annual Conference of the Japan Society of Civil Engineers. V-463. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Iwashita, K., Wu, Z.S., Hayashi, K., Higuchi, T.and Murakami, S.: "Experimental study on strengthening method of RC flexural structures with externally bonded prestressed PBO fiber sheet"Proceedings of the 55th Annual Conference of the Japan Society of Civil Engineers. V-389. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Wu, Z.S., Kurokawa, T., Yoshizawa, H.and Hirahata, H.: "A Study on Bond and Debonding Mechanism of Bonded FRP Laminates in Beam Members"Journal of Structural Engineering. Vol. 46A. 1469-1478 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Wu, Z.S.and Niu, H.D.: "Study on Debonding Failure Load of RC Beams Strengthened with FRP Sheets"Journal of Structural Engineering. Vol. 46A. 1431-144 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Wu, Z.S., Matsuzaki, T., Yokoyama K.and Kanda T.: "Retrofitting Method for RC Structures with Externally Prostressed Carbon Fiber Sheets"Proceedings of the 4th Int.Symp.FRPRCS, SP-188-65, ACI International. 751-765 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yoshizawa, H.and Wu, Z.S.: "Crack behavior of Plain Concrete and RC members Strengthened with Carbon Fiber Sheets"Proceedings of the 4th Int.Symp.FRPRCS, SP-188-66, ACI International. 767-779 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yin, J.and Wu, Z.S.: "Interface Crack Propagation in FRP Strengthened Concrete Structures using Nonlinear Fracture Mechanics"Proceedings of the 4th Int.Symp.FRPRCS, SP-188-87, ACI International. 1035-1047 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tomioka, R., Wu, Z.S., Yokoyama, K.and Xu, B.: "Vibration reduction effect of RC beams with externally bonded prestressed FRP sheets"Proceedings of the 54th Annual Conference of the Japan Society of Civil Engineers. V-376. 752-753 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Niu, H.D., Wu, Z.S.and Asakura, T.: "A Numerical Analysis on Bonding Mechanism of FRP-strengthened Concrete Structures Using Nonlinear Fracture Mechanics"Proceedings of the Japan Concrete Institute. Vol. 21, No. 3. 73-78 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yuan,H.,Wu,Z.S.and Yoshizawa,H.: "Theoretical solutions on interfacial stress transfer of externally bonded steel/composite laminates"Journal of Structural Mechanics and Earthquake Engineering, JSCE. (登載決定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Niu,H.D.and Wu,Z.S.: "Interfacial debonding mechanism influenced by flexural cracks in FRP-strengthened beams"Journal of Structural Engineering. Vol.47A(登載決定). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yin,J.and Wu,Z.S.: "FE Analysis on Interaction Between Interfacial and flexural Cracking Behaviors of FRP-Strengthened Concrete Beams"The Fourth Japan-China Joint Conference on Composites. 12-15 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Iwashita,K.and Wu,Z.S.: "Strengthening Method for Reinforced Concrete Flexural Structures with Externally Prestressed PBO Sheets"The Fourth Japan-China Joint Conference on composites. 22-25 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Niu,H.and Wu,Z.S.: "Proposed Design Guideline for Debonding Failure of FRP-strengthened Flexural Members"The Fourth Japan-China Joint Conference on Composites. 26-31 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 古澤弘之,呉智深,袁鴻,金久保利之: "連続繊維シートとコンクリートの付着拳動に関する検討"土木学会論文集. No.662/V-49. 105-119 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Wu,Z.S.,and Niu,H.: "Shear Transfer Along FRP-Concerte Interface in Flexural Members, Journal of Materials"Concrete Structures and Pavement, JSCE. No.662/V-49. 231-245 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 高橋貴蔵,呉智深,堀内辰夫: "光ファイバセンサによるFRP板-コンクリート接着界面の界面剥離モニタリングに関する研究"第55回年次学術講演会講演概要集. V-463. (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 岩下健太郎,呉智深,林啓司,樋口哲郎,村上信吉: "PBO連続繊維シート緊張接着によるRC曲げ部材の補強法に関する研究"第55回年次学術講演会講演概要集. V-389. (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 呉智深,黒川徹二,吉澤弘之,平畑裕嗣: "梁部材におけるFRP面状補強材の界面接着・剥離メカニズムに関する研究"構造工学論文集. Vol.46A. 1469-1478 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Wu,Z.S.and Niu,H.D.: "Debonding Failure Load of RC Beams Strengthened With FRP Sheets"Journal of Structural Engineering,JSCE. Vol.46 A. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Wu,Z.S.,Matsuzaki,T.,Yokoyama K.and Kanda T.: "Retrofitting Method for RC Structures with Externally Prostressed Carbon Fiber Sheets"Proceedings of the 4th Int.Symp.FRPRCS,ACI International. SP-188-65. 751-765 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yoshizawa,H.and Wu,Z.S.: "Crack behavior of Plain Concrete and RC members Strengthened with Carbon Fiber Sheets"Proceedings of the 4th Int.Symp.FRPRCS,ACI International. SP-188-66. 767-779 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Yin,J.and Wu,Z.S.: "Interface Crack Propagation in FRP Strengthened Concrete Structures using Nonlinear Fracture Mechanics"Proceedings of the 4th Int.Symp.FRPRCS,ACI International. SP-188-87. 1035-1047 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 冨岡龍一,呉 智深,横山功一,許 斌: "FRPシート緊張接着補強による低減効果に関する研究"土木学会第54回年次学術講演会講演概要集. V-376. 752-753 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 牛 赫東,呉 智深,朝倉俊弘: "A Numerical Analysis on Bonding Mechanism of FRP-strengthened Concrete Structures Using Nonlinear Fracture Mechanics"コンクリート工学年次論文報告集. Vol.21,No.3. 73-78 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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