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Application of Stochastic Geometry for Evaluating Damage Level due to Cracking in Concrete Structures

Research Project

Project/Area Number 13650613
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Building structures/materials
Research InstitutionTohoku University

Principal Investigator

MIHASHI Hirozo  Tohoku Univ., Graduate School of Eng., Prof., 大学院・工学研究科, 教授 (90091751)

Co-Investigator(Kenkyū-buntansha) ARIKAWA Satoshi  National Institute for Land and Infrastructure Management, Ministry of Land Infrastructure and Transport, Senior Researcher, 建築研究所・第二研究部, 主任研究員
KIRIKOSI Kazuki  Tohoku Univ., School of Eng., Research Eng., 工学部, 教務職員 (60240660)
KANEKO Yoshio  Tohoku Univ., Graduate School of Eng., Assoc. Prof., 大学院・工学研究科, 助教授 (60312617)
SAICHI Masayoshi  Tohoku Institute of Technology, School of Eng., Lecturer, 工学部, 講師 (90104132)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥3,200,000 (Direct Cost: ¥3,200,000)
KeywordsConcrete / Crack / Damage level / Fractal analysis / Microscope observation / Multifractal
Research Abstract

While geometrical randomness of cracks in concrete structures on micro, meso and macro levels were taken into consideration, methodologies for evaluating the damage level developed and fundamental studies to apply these methodologies for existing damaged concrete structures were carried out. Obtained results are summarized as follows:
1) As a fundamental study to link crack information and damage level of concrete structures, microcracks on the surface of concrete cylinders were observed by means of microscope. Then relationships between the crack information and the stiffness reduction, and/or the velocity of ultrasonic wave were studied experimentally.
2) Microcracks in concrete specimens damaged by freezing and thawing action or cyclic loading were statistically analyzed. Since the microcracks due to freeze and thawing action were so thin and densely distributed that ordinary counting methods don't work sufficiently, a new method was developed on the basis of a stochastic geometry concept. These microcracks due to freezing and thawing actions were remarkably accumulated in an early stage of the cycles and then gradually increased.
3) Strain-rate calculated by the differential of the stress-strain curve showed a possibility to be treated as an index to quantify the damage level.
4) Fractal analyses were carried out to analyze crack patterns observed in existing structures so as the fractal dimension to be a meso level parameter. Damage levels of existing concrete structures were qualitatively evaluated from the typical crack patterns.
5) Multifractarity was examined in cracks on concrete walls. Macroscopic changing patterns of the fractality in each sub-area were also investigated by analyzing the subdivided concrete walls.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] M.Saichi: "DETERIORATION PROPERTIES OF DAMAGED CONCRETE DUE TO FREEZING AND THAWING"Proc.of ICF10, CD-ROM. ICF100834 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 最知 正芳: "凍結融解作用を受けたコンクリート内部の微細きれつの定量化と損傷度評価への応用"コンクリート工学論文集. 第13巻・第1号. 13-24 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 山田 雅美: "コンクリート構造物におけるひびわれパターンの定量的評価方法に関する研究"日本建築学会大会学術講演梗概集(北陸). A-1, 材料施工. 885-886 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 山田 雅美: "コンクリート構造物におけるひびわれパターンの定量的評価手法開発に関する基礎的研究"日本建築学会大会学術講演梗概集(東海). (印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Saichi, H. Shinohe, H. Mihashi: "Deterioration Properties of Damaged Concrete due to Freezing and Thawing"Proc. of International Congress on Fracture (ICF10), CD-ROM. ICF100834. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Saichi, H. Shinohe, H. Mihashi: "Quantification of Internal Cracks Developed within Frost-damaged Concrete"Concrete Research and Technology Japan Concrete Inst.. 13, No.1. 13-24 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Yamada, H. Mihashi: "Quantitative Evaluation of Crack Patterns in Concrete Structures"Proc. of the Annual Meeting of Architectural Inst. of Japan. A-1. 885-886 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] M. Yamada, H. Mihashi: "Quantitative Evaluation of Crack Patterns in Concrete Structures (Part II)"Proc. of the Annual Meeting of Architectural Inst. of Japan. A-1, (in press). (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 山田 雅美: "コンクリート構造物におけるひびわれパターンの定量的評価方法に関する研究"日本建築学会大会学術講演梗概集(北陸). A-1、材料施工. 885-886 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Saichi: "DETERIORATION PROPERTIES OF DAMAGED CONCRETE DUE TO FREEZING AND THAWING"ICF10, CD-ROM (ICF100834OR). (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 最知 正芳: "凍結融解作用を受けたコンクリート内部の微細きれつの定量化と損傷度評価への応用"コンクリート工学論文集. Vol.13,No.1. 13-24 (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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