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2002 Fiscal Year Final Research Report Summary

Experimental / Theoretical Study on Strengthening effect enhancements of RC Structures with Hybrid FRP Laminates

Research Project

Project/Area Number 13650501
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., Professor college of Engineering, 工学部, 教授 (00223438)

Co-Investigator(Kenkyū-buntansha) FUKUZAWA Kimio  IBARAKI Univ., Professor college of Engineering, 工学部, 教授 (50165271)
HARADA Takao  IBARAKI Univ., Research Associate college of engin., 工学部, 助手 (00241745)
YOKOYAMA Koichi  IBARAKI Univ., Professor college of Engineering, 工学部, 教授 (20302325)
Project Period (FY) 2001 – 2002
KeywordsFiber reinforced polymer (FRP) / Hybrid / Relieving of stress concentration / Flexural strengthening / Debonding / Fracture mechanics / Finite element analysis / Optimum and integrated design
Research Abstract

(1) Basic Hybrid Design of Different Fiber Sheets
The needs, requirements and points at issue on hybrid laminates by hybridizing different fibers are cleared up through investigating different design indices such as initial stiffness, rupture strength, ultimate strength and ductility and control indices such as strain hardening characteristics and stress drop due to successive fiber rupture. Based on these achievements, the design methods of hybrid FRP laminates by using different fibers such as three types of carbon fiber sheets with superhigh modulus, high modulus and high strength, two types of aramid fiber sheets with different moduli, PBO fiber sheet and glass fiber sheet with high rupture strain are proposed for different purposes. Moreover, the corresponding design program is also coded.
(2) Experimental and Theoretical Investigations on Believing of Stress Concentrations due to Fiber Rupturing Impacts
In order to improve above basic hybrid design, an analysis is performed to inves … More tigate how to relieve the stress concentrations induced by successive rupture of fibers. In addition, some tension tests were conducted to demonstrate the effect of PBO fibers with higher ability of energy absorption for relieving stress concentrations.
(3) Experimental and Numerical Investigations on Strengthening Effects in Compressive and Flexural Concrete Members Strengthened with Hybrid Fiber Sheets
The designed hybrid fiber sheets are used to flexurally strengthen plain and reinforced concrete beams and the corresponding strengthening effects are qualitatively evaluated in terms of stiffness, strength, ductility and crack resistance. In addition, a series of concrete cylinder specimens wrapped with the proposed hybrid fiber sheets is used to investigate the confinement effects through varying different variables such as reinforcing ratios (spacing of wrapped fiber sheet strips) and concrete strength, etc.
(4) Investigations on Interfacial Bond Behavior and Failure Mechanism along FRP and Concrete interface
First, analytical equations are derived for predicting the bond carrying capacity in RC prisms bonded with FRP sheets. Based on a lot of experimental observations, both analytical and numerical analyzes are performed to give a clear insight into the bonding and debonding mechanisms in RC flexural members strengthened with different hybrid FRP sheets.
(5) Establishments of Design Method and FE Model
Through above analytical and numerical investigations, an existing analytical approach for predicting interfacial debonding failure is modified for evaluating the debonding behavior of strengthened structures with hybrid fiber sheets. A comprehensive design guideline is then developed to include all the possible failure modes such as steel yielding-FRP rupture, concrete crushing, shear failure and various debonding failures. Moreover, a constitutive model is established on the basis of experimental results to simulate the progressive rupture of fibers in hybrid fiber sheets and thus a nonlinear FE analysis can be implemented to evaluate both failure progresses caused by progressive rupture of fibers and cracking of concrete.
(6) Optimum and integrated Design of RC Structures strengthened with Hybrid Fiber Sheets
To further develop the hybrid design concept, a series of experimental and numerical investigations is conducted to discuss countermeasures of realizing structural integrity of strengthened structures on different structural performances such as the initial stiffness, yield and ultimate loads and structural ductility under controlled load drops caused by progressive fiber ruptures. Through these investigations, an optimum design method on structures strengthened with hybrid FRP sheets is also proposed. Less

  • Research Products

    (44 results)

All Other

All Publications (44 results)

  • [Publications] Chen, T., Wu, Z.S.: "Interfacial debonding mechanism of FRP-strengthened concrete structures with BEM"Proceedings of 4th International Conference of Fracture Mechanics of Concrete and Concrete Structure. 785-792 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yin, J., Wu, Z.S.: "Simulation on crack distribution in FRP-strengthened concrete beams with interfacial fictitious crack model"Proceedings of 4th international conference of fracture mechanics of concrete and concrete structure. 1079-1086 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Niu, H.D., Wu, Z.S.: "Prediction of debonding load due to flexural cracks of concrete for FRP-strengthened structures"Proceedings of the Fifth International Conference on Fiber-Reinforced Plastics for Reinforced Concrete Structures (FRPRCS-5). Vol.1. 361-370 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, Z.S., Niu, H.D., Yin, J.: "On interfacial fracture in FRP-strengthened structures"Proceedings of International Symposium of Young Scholars on Mechanics and material Engineering for Science and Experiments. 72-80 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, Z.S., Yuan, H., Yoshizawa H., Kanakubo, T.: "Experimental/Analytical Study on Interface Fracture Energy and Fracture Propagation along FRP-Concrete Interface"Fracture Mechanics for Concrete Materials : Testing and Applications, ACI International. SP-201-8. 133-152 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yin, J., Wu, Z.S., Asakura, T.: "FE Analysis on Cohesive Debonding and Cracking Behavior of FRP-Strengthened Concrete Beams by Nonlinear Fracture Mechanics"Fracture Mechanics for Concrete Materials : Testing and Applications, ACT International. SP-201-15. 267-281 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 殷 峻, 呉 智深, 田口 智: "FRPシートで補強した鋼繊維コンクリート曲げ部材のひび割れ分散性状に関する研究"第56回年次学術講演会議演概要集. V-529. 1058-1059 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂本宏司, 呉 智深, 吉澤弘之, 黒川徹二: "炭素繊維シートのハイブリッド化による曲げ構造部材の補強効果による検討"第56回年次学術講演会議演概要集. V-537. 1074-1075 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu Z.S., Sakamoto K., Niu H.D., Kurokawa T.: "Retrofitting RC beams with innovative hybrid fiber sheets"Proceedings of the Seventh Japan International SAMPE Symposium. 383-386 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Niu, H.D., Wu, Z.S.: "Peeling-off criterion for FRP-strengthened R/C flexural members"Proceedings of the International conference on FRP composites in civil engineering. Vol.1. 571-578 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yin, J., Wu, Z.S.: "Structural performance of steel-fiber reinforced concrete beams with externally bonded CFRP sheets"Proceedings of the International conference on FRP composites in civil engineering. Vol.1. 641-648 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, Z.S., Yin, J., Niu, H.D.: "Some recent achievements in FRP bonding techniques"Proceedings of the International conference on FRP composites in civil engineering. Vol.2. 1021-1032 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, Z.S., Yuan, H., Niu, H.D.: "Stress Transfer and Fracture Propagation in Different kinds of Adhesive Joints"Journal of Engineering Mechanics, ASCE. Vol.128,No.5. 562-573 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, Z.S., Yin, J.: "Numerical Analysis on Interfacical Fracture Mechanism of Externally FRP-Strengthened Structural Members"J. Materials, Conc. Struct. Pavements, JSCE. No.704,Vol.55. 257-270 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Niu, H.D., Wu, Z.S.: "Analytical Modeling on Debonding Failure of FRP-Strengthened RC Flexural Structures"The Third International Conference on Composites in Infrastructure. (CD-ROM). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, Z.S., Sakamoto, K., Niu, H.D.: "Strengthening Effects of Concrete Flexural Members Retrofitted with Hybrid FRP Composites"The Third International Conference on Composites in Infrastructure. (CD-ROM). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, Z.S., Niu, H.D.: "New Concept and Application of FRP Laminates for Strengthening Infrastructure"The Fifth China-Japan-U.S Joint Conference on Composites. 36-49 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Niu, H.D., Wu, Z.S.: "New Achievements in FRP Bonding Techniques"Proceedings of the Seventh International Symposium on Structural Engineering for Young Experts. Vol.2. 886-893 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Niu, H.D., Wu, Z.S.: "Strengthening Effects of RC Flexural Members with FRP Sheets Affected Adhesive Layers"Journal of Applied Mechanics, JSCE. Vol.5. 887-897 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 澤田嘉子, 呉 智深, 島田政紀, 村上信吉: "ハイブリッド連続繊維補強棒材の創出に関する基礎的研究"土木学会第57回年次学術講演会. V-336. 671-672 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, Z.S., Yin, J.: "Fracturing Behaviors of FRP-Strengthened Concrete Structures"Engineering Fracture Mechanics. No.70. 1339-1355 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Niu, H.D., Wu, Z.S.: "Numerical Simulations on Strengthened Structures with Hybrid Fiber Sheets"Proceedings of the Sixth International Conference on Fiber-Reinforced Polymer Reinforcement for Concrete Structures (FRPRCS-6). (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Chen, T. and Wu, Z. S.: "Interfacial Debonding Mechanism of FRP-Strengthened Concrete Structures with BEM"Proceedings of 4th International Conference of Fracture Mechanics of Concrete and Concrete Structure. 785-792 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yin, J. and Wu, Z. S.: "Simulation on Crack Distribution in FRP-Strengthened Concrete Beams with Interfacial Fictitious Crack Model"Proceedings of 4th International Conference of Fracture Mechanics of Concrete and Concrete Structure. 1079-1086 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Niu, H. D. and Wu, Z. S.: "Prediction of Debonding Load Due to Flexural Cracks of Concrete for FRP-Strengthened Structures"Proceedings of the Fifth International Conference on Fiber- Reinforced Plastics for Reinforced Concrete Structures (FRPRCS-5). 1. 361-370 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, Z. S., Niu, H. D, and Yin, J.: "On Interfacial Fracture in FRP-Strengthened Structures"Proceedings of International Symposium of Young Scholars on Mechanics and Material Engineering for Science and Experiments. 72-80 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, Z. S., Yuan, H., Yoshizawa, H. and Kanakuho, T.: "Experimental/Analytical Study on Interface Fracture Energy and Fracture Propagation Along FRP-Concrete Interface"Fracture Mechanics for Concrete Materials : Testing and Applications. ACI International SP-201-8. 133-152 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yin, J,, Wu, Z. S. and Asakura, T.: "FE Analysis on Cohesive Debonding and Cracking Behavior of FRP-Strengthened Concrete Beams by Nonlinear Fracture Mechanics"Fracture Mechanics for Concrete Materials : Testing and Applications. ACI International SP-201-15. 267-281 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yin, J., Wu, Z. S. and Taguchi, S,: "Crack distribution of Steel fiber concrete beams strengthened with FRP sheets"Proceedings of the 56th Annual Conference of the Japan Society of Civil Engineers. V-529. 1058-1059 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sakamoto, K., Wu, Z. S., Yoshizawa, H. and Kurokawa, T.: "Study on Reinforcement Effects of RC Beams with hybrid Carbon Fiber Sheet"Proceedings of the 56th Annual Conference of the Japan Society of Civil Engineers. V-537. 1074-1075 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu Z. S., Sakamoto K., Niu H. D. and Kurokawa T.: "Retrofitting RC Beams with Innovative Hybrid Fiber Sheets"Proceedings of the Seventh Japan International SAMPE Symposium. 383-386 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Niu, H. D. and Wu, Z. S.: "Peeling-Off Criterion for FRP-Strengthened R/C Flexural Members"International Conference on FRP Composites in Civil Engineering. 1. 571-578 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yin, J. and Wu, Z. S.: "Structural Performance of Steel-Fiber Reinforced Concrete Beams with Externally Bonded CFRP Sheets"International Conference on FRP Composites in Civil Engineering. 1. 641-648 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, Z. S. and Yin, J. and Niu, H. D.: "Some Recent Achievements in FRP Bonding Techniques"International Conference on FRP Composites in Civil Engineering. 2. 1021-1032 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, Z. S., Yuan, H, and Niu, H. D.: "Stress Transfer and Fracture Propagation in Different kinds of Adhesive Joints"Journal of Engineering Mechanics, ASCE. 128, No.5. 562-573 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, Z. S. and Yin, J.: "Numerical Analysis on Interfacial Fracture Mechanism of Externally FRP-Strengthened Structural Members"J. Materials, Conc. Struct. Pavements, JSCE, No.704. 55. 257-270 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Niu, H. D. and Wu, Z. S.: "Analytical Modeling on Debonding Failure of FRP-Strengthened RC Flexural Structures"The Third International Conference on Composites in Infrastructure. CD-ROM. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, Z. S., Sakamoto, K. and Miu, H. D.: "Strengthening Effects of Concrete Flexural Members Retrofitted with Hybrid FRP Composites"The Third International Conference on Composites in Infrastructure. CD-ROM. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, Z. S. and Niu, H. D.: "New Concept and Application of FRP Laminates for Strengthening Infrastructure"The Fifth China-Japan-U. S Joint Conference on Composites. 36-49 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Niu, H. D. and Wu, Z. S.: "New Achievements in FRP Bonding Techniques"Proceedings of the Seventh International Symposium on Structural Engineering for Young Experts. 2. 886-893 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Niu, H. D. and Wu, S. S.: "Strengthening Effects of RC Flexural Members with FRP Sheets Affected Adhesive Layers"Journal of Applied Mechanics. 5. 887-897 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sawada, Y., Wu, Z. S., Shimada, M. and Murakami, S.: "Fundamental research on creation of hybrid continuation fiber reinforcement stick material"Proceedings of the 57th Annual Conference of the Japan Society of Civil Engineers. V-336. 671-672 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Wu, Z. S, and Yin, J.: "Fracturing Behaviors of FRP-Strengthened Concrete Structures"Engineering Fracture Mechanics. 70. 1339-1355 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Niu, H. D, and Wu, Z. S.: "Numerical Simulations Strengthened Structures with Hybrid Fiber Sheets"Proceedings of the Sixth International Conference on Fiber-Reinforced Polymer Reinforcement for Concrete Structures (FRPRCS-6). in Press. (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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