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Experimental Study on Earthquake Resistance of Underwater Granular Structures

Research Project

Project/Area Number 02805052
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 土木構造
Research InstitutionUniversity of Tokyo

Principal Investigator

KONAGAI Kazuo  Assoc. Prof. Institute of Industrial Science University of Tokyo, 生産技術研究所, 助教授 (50126471)

Co-Investigator(Kenkyū-buntansha) TAMURA Choshiro  Prof. College of Industrial Technology Nihon University, 生産技術研究所, 教授 (90013101)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1991: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1990: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsVisualization / Granular Structure / Underwater Structure / Earthquake Resistance / Laser-Aided Tomography / Water-Structure Interaction / Dynamic Stability / 粒状体 / レーザー / 水中構造 / 地震応答 / レ-ザ- / 耐震工学 / レ-ザ-光シ-ト
Research Abstract

A new experimental technique to visualize the dynamic behavior of underwater particle assemblage (LAT: Laser-Aided Tomography) was developed. According to the proposed method, a granular structure model, made of particles of crushed glass and immersed in liquid with the same refractive index, consequently becomes invisible. An intense laser-light "sheet" (LLS) is then passed through it, illuminating the contour lines of all the particles within a cross-section. Scanning the model with LLS allows a 3D image of every discrete particle's shape and motion to be obtained as well as the whole-field deformation of the model. Utilization of this method with a smaller particle size will expand its application to analyses of structures made up of finer grains. In this case, however, it is not easy to have a clear look at each particle on the LLS. Some techniques were developed to overcome the problem, and we could reduce the grain size of the employed glass material to lmm or smaller.
Dynamic failure test of embankment-shaped models were conducted using the proposed technique. The models made of screened particles ( 2mm < grain < 5mm ) were shaken sinusoidally in the liquid. The surface of the model began to slide when the amplitude of base acceleration exceeded a threshold. The threshold acceleration increased with excitement frequency, while variation of threshold velocity was rather small, and was scattered in the range of 0.5 to 2.0 kine.
The failure process and its frequency dependence observed in LAT experiments was then discussed using the Discrete Elliptic Element Method (DEEM), considering contributions of overall slip and roll to the failure process. The DEEM simulation gave us a general idea of the dilatation effect on overall behavior and its frequency dependence.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] 小永井 一男他: "粒状体構造模型内部の動的挙動の可視化と解析" 第8回日本地震工学論文集. 2. 1221-1226 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] KONAGAI Kazuo他: "Visualization of Dynamic Change in Configuration of Underwater Particle Assemblage" Structural Dynamies(Proceedings of 1990 Eusopean Conferencr on Structural Dynamics). 2. 837-841 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 小永井 一男他: "レーザートモグラフィーによる粒状体構造模型内部の動的破壊過程の可視化" ダム工学. 5. 5-12 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] KONAGAI Kazuo他: "Visualization and Analysis of Dynamic Belavior of Underwater Granular Structure Models" Proceedings of the 10th World Conference on Eanthguake Engineening. 5. 2731-2736 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] KONAGAI Kazuo他: "Laser-Aided Tcmography:A Tool for Visualization of Changes in the Fabric of Granulor Assemblage" Structural Engineering / Earthguake Engineering(Proceadings of Jopan Society of Civil Engireers). 455/I-21. 25-33 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Rangelow Peter他: "Visualization of Grarular Material Deformation through Laser-Aided Tcmography" Bulletin of Earthguake Resistant Structure Research Center,Instifute of Industrial Science,Uriversity of Tokyo. 25. 61-67 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 松島 亘志他: "個別楕円要素法による粒状体構造物の破壊過程の検討" 生産研究. 44. 44-47 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] MATSUSHIMA Takashi: "Failure Process of Coarse Particle Assemblage and its Freguency Dependcncy" Proceedings of 2nd European Conference on Structural Dynamics. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Konagai, K. et al.:"Visualization and Analysis of Dynamic Behavior of Granular Structures" Proc. of 8th Japan Earthquake Engineering Symposium. Vol.2. 1221-1226 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Konagai, K. et al.:"Visualization of Dynamic Changes in Configuration of Underwater Particle Assemblage" Structural Dynamics (Proc. of 1990 European Conference on Structural Dynamics), Krazig et al. (cds.). Vol.2. 837-841 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Konagai, K. et al.:"Visualization of Failure Process of Granular Structure Models by Laser-Aided Tomography" Jour., Japan Society of Dam Engineers.No.5. 5-12 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Konagai, K. et al.:"Visualization and Analysis of Dynamic Behavior of Underwater Granular Structure Models" Proc. of 10th World Conference on Earthquake Engineering. Vol.5. 2731-2736 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Konagai, K. et al.:"Laser-Aided Tomography: A Tool for Visualization of Changes in the Fabric of Granular Assemblage" Structural Eng./ Earthquake Eng. (Proc. of JSCE),. No.455/I-21. 25-33 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Rangelow, P. et al.: "Visualization of Granular Material Deformation through Laser-Aided Tomography" Bull., Earthquake Resistant Structure Research Center. No.25. 61-67 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Matsushima, T. et al.: "Analysis of Dynamic Failure of Coarse Particle Assemblage by Discrete Elliptic Element Method" "SEISAN-KENKYU" (Monthly Journal of the Institute of Industrial Science), Institute of Industrial Science, Univ. of Tokyo. Vol.44, No.4. 44-47 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Matsushima, T. et al.: "Failure Process of Coarse Particle Assemblage and its Frequency Dependency" Proc. of 2nd European Conference on Structural Dynamics, Trondheim, Norway. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 小長井 一男 他: "レーザートモグラフィーによる粒状体構造模型内部の動的破壊過程の可視化" ダム工学. 5. 5-12 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Konagai Kazuo 他: "Visualization and Andysis of Dynamic Behavior of Underwater Granular Structure Models" Proc.of 10th World Conference on Earthquake Engineering. 5. 2731-2736 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Konagai Kazuo 他: "Laser-Aided Tomography:A Tool for Visualization of Changes in the Fabric of Granular Assemblage" Structural Engineering/Earthquake Engineering (Proc.of Japan Society of Civil Engineers). 455/I-21. 25-33 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Motsushima Takashi 他: "Failure Process of Coarse Partide Assemblage and Its Frequency Dependency" Proc.of 2nd European Conference on Structural Dynomics. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Rangelow Peter,他: "Visualization of Granular Material Deformation through LaserーAided Tomography" Bulletin of Earthquake Resistant Struchiee Rosearch Center. 25. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 小長井 一男,他: "レ-ザ-トモグラフィ-による粒状体構造模型内部の動的破壊過程の可視化" ダム工学. 5. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Konagai Kazuo,他: "Visualization and Analysis of Dynamic Behavior of Underwater Granular Structure Models" Proceedings of 11th World Conference on Earthquake Engineering. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 松島 亘志,他: "離散楕円要素法による粒状体構造物の破壊過程の検討" 生産研究. 44ー4. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 小長井 一男: "粒状体構造模型内部の動的挙動の可視化と解析" 第8回日本地震工学シンポジウム論文集. 2. 1221-1226 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Kazuo KONAGAI: "Visualization of Dynamic Change in Configuration of Underwater Particle Assemblage" Proc.of European Conference on Structural Dynamics,Bochum,Germany,1990. (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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