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2003 Fiscal Year Final Research Report Summary

Strain Rate Effect on Reinforced Concrete Members under Cyclic and Dynamic Loading

Research Project

Project/Area Number 14350296
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Building structures/materials
Research InstitutionChiba University (2003)
The University of Tokyo (2002)

Principal Investigator

OTANI Shunsuke  Chiba University, Faculty of Engineering, Professor, 工学部, 教授 (30133101)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Toru  Chiba University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (10226855)
SHIOHARA Hitoshi  University of Tokyo, School of Engineering, Associate Professor, 大学院・工学系研究科, 助教授 (50272365)
Project Period (FY) 2002 – 2003
KeywordsStrain Rate / Loading Rate / Reinforced Concrete Members / Strength / Failure Mode / Ductility / Test / Loading History
Research Abstract

To simulate accurately the behavior of building structural systems under earthquake loading, the model for the structural members should be accurate enough in particular under dynamic and cyclic loading condition. Hence, one-third scale nine-teen reinforced concrete cantilever beam specimens were tested to failure to compare their behavior under dynamic and quasi-static loading condition. The parameters for the test include loading speed as well as amount of longitudinal reinforcement, shear reinforcement, shear-span to depth ratio, shear stress level, strength of transverse reinforcement and loading history. The list of conclusions are as follow,
1.The specimens under dynamic loading showed always larger flexural yielding strength than its pair with same parameter tested under quasi-static loading. It is possible to estimate the strength increase quantitatively with affordable presision, by considering the increase in yield point strength of the longitudinal steel and flexural theory.
2.As far as the tests in this research concerns, loading speed has little effect on the ductility capacity in terms of the largest deflection at which significant strength decay initiates after cyclic loading. One of the most influential parameter on the ductility is not loading speed, but loading history, i.e. strength decay was delayed significantly in the specimen tested under one directional cyclic loading history.
3.A special technique was invented to measure stress in longitudinal bar after tensile yielding and applied to the tests. The observed tensile stress in longitudinal bar were well estimated by flexural theory before flexural yielding, whereas, larger tensile stress is obtained than the theory for tensile reinforcing bars in hinge zone and larger compressive stress in compressive reinforcing bars which gradually increased due to cyclic loading.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 金子貴司: "せん断余裕度確保の方法が異なる鉄筋コンクリート梁部材の動的載荷実験"コンクリート工学協会年次論文集. 24. 337-342 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shunsuke OTANI: "Strain Rate Effect on Performance of Reinforced Concrete Members"Proceedings of the fib2003 Symposium, Athen. (CD-ROM). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 金子 洋: "載荷速度の影響に基づくRC部材復元力モデルの構築"日本建築学術講演梗概集C-2. 303-304 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 金子 洋: "動的繰返し載荷を受ける鉄筋コンクリート片持ち梁の変型能に及ぼす載荷速度とせん断力の影響"コンクリート工学協会年次論文集. 25(発表予定). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 東川敬子: "動的繰返し載荷を受けるRC梁部材の変形性能に関する研究(その1)"日本建築学会大会学術講演梗概集C-2. (発表予定). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 金子 洋: "動的繰返し載荷を受けるRC梁部材の変形性能に関する研究(その2)"日本建築学会大会学術講演梗概集C-2. (発表予定). (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takashi Kaneko et al.: "Dynamic Loading Testing on R/C Beams Submitted to different Method to Obtain Shear Capacity"Proceedings of the Japan Concrete Institute (in Japanese). Vol.24. 337-342 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shunsuke Otani et al.: "Strain Rate Effect on Performance of Reinforced Concrete Members"Proceedings of the fib 2003 Symposium, Athen, Greece (in English). (CD-ROM). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Kaneko et al.: "A New Hysteresis Model Considering Strain Rate Effects in R/C Members"Summaries of Technical Papers of Annual Meeting of AIJ Structures IV, Toukai, 2003 (in Japanese). 303-304 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Kaneko et al.: "Test on Ductility Capacity of Reinforced Concrete Cantilever Beams under dynamic loading"Proceedings of the Japan Concrete Institute (in Japanese). Vol.24(to be published).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Keiko Azukawa et al.: "Study on Ductility Capacity of R/C beams under dynamic loading (Part 1)"Summaries of Technical Papers of Annual Meeting of AIJ Structures IV, Hokkaido, 2003 (in Japanese). (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Kaneko et al.: "Study on Ductility Capacity of R/C beams under dynamic loading (Part 2)"Summaries of Technical Papers of Annual Meeting of AIJ Structures IV, Hokkaido, 2003 (in Japanese). (to be published).

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

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Published: 2005-04-19  

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