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Practical Method of Reliability-based Assessment and Lifecycle Management of Deteriorating Existing Structures

Research Project

Project/Area Number 13650624
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

MORI Yasuhiro  Nagoya University, School of Environmental Studies, Associate.Professor, 環境学研究科, 助教授 (30262877)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2002: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsStructural Reliability / Limit State Design / Structural Degradation / Load and Resistance Factors / Load Combination / Stochastic Process / Inspection and Maintenance / ライフサイクルコスト / 確率過程
Research Abstract

The continued use of existing structures is one of the most important factors for achieving sustainable society. In order to assess such structures for continued future service, simple and practical tools need to be developed for evaluating the time-dependent reliability and performance of the structures.
The investigator has introduced the concept of a resistance reduction factor in order to take the impact of degradation of a structural component on its performance level into account in a scalar value. With the factor a time-dependent reliability problem can be approximated as a time-independent one and existing simple methods such as AFOSM can be used for reliability assessment. In this research, a practical formula for a resistance reduction factor is proposed classifying the cumulative distribution functions according to the classification of parent distributions of extreme value distributions. Numerical examples show that the method provides an estimate with relatively large error … More when the variability in the principal load is small and/or the variability in the resistance is large. Yet the error level is comparable with the error due to AFOSM and would not cause a problem in practice.
Periodic in-service inspection followed by suitable maintenance may restore a degraded structural component to near-original condition. Since inspection and maintenance are costly, there are tradeoffs between the extent and accuracy of inspection, required level of reliability, and cost. To design an optimum inspection/maintenance strategy with minimum expected total lifecycle cost, generally non-linear optimization problem must be solved. The practical method can be applied to estimate a resistance reduction factor including the cases when the strength of a component changes discontinuously in time due to, such as, restoration. Using the proposed method, the time-dependent reliability analysis can be avoided in the optimization and the computational time can be reduced about a fiftieth. Less

Report

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

    (19 results)

All Other

All Publications (19 results)

  • [Publications] 野中桃子, 森 保宏, 尾崎隆司: "劣化影響係数を用いた既存構造物の信頼性評価"日本建築学会大会学術講演梗概集. B-1. 25-26 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 加藤隆宏, 森 保宏: "限界状態設計に用いる劣化影響係数の実用的評価手法"日本建築学会東海支部研究報告集. 第40号. 125-128 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Mori, Y., M.Nonaka: "Load and Resistance Factors for the Assessment of Deteriorating Existing Structures"Structural Safety and Reliability. (CD-ROM). 8 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Mori, Y., T.Takada, H.Idota: "Practical Method to Determine Load and Resistance Factors Used in Limit State Design,"Proc. of 1st ASRANet Int. Colloquium, Glasgow, Scotland. (CD-ROM). 14 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 加藤隆広, 森 保宏: "劣化関数の不確定性を考慮した信頼性評価手法"日本建築学会大会学術講演梗概集. B-1. 9-10 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 加藤隆広, 森 保宏: "既存構造物の信頼性評価に用いる劣化影響係数の実用的評価手法"日本建築学会東海支部研究報告集. 第40号. 161-164 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nonaka, M, Mori, Y.and Ozaki, T.: "Reliability Analysis of Existing Structures using Equivalent Degradation Factor"Summary of Technical Papers of Annual Meeting, AIJ. B-I. 25-26 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Mori, Y.and Nonaka, M.: "LRFD for Assessment of Deteriorating Existing Structures"Structural Safety. Vol.23, No.4. 297-313 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kato, T.and Mori, Y.: "Practical Resistance Reduction Factor for Use in Limit State"Proc.AIJ Tokai Chapter Architectural Research Meeting, AIJ. No.40. 125-128 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Mori, Y.and Nonaka, M.: "Load and Resistance Factors for the Assessment of Deteriorating Existing Structures"Structural Safety and Reliability, Proc.of ICOSSAR '01, CD-Rom. 8 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Mori, Y., Takada T., and Idota, H.: "Practical Method to Determine Load and Resistance Factors Used in Limit State Design"Proc.of 1st ASRANet Int.Colloquium, Glasgow, Scotland, CD-Rom. 14 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kato, T.and Mori, Y.: "Reliability Assessment Considering the Variability in Degradation Function"Summary of Technical Papers of Annual Meeting, AIJ. B-I. 19-20 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kato, T.and Mori, Y.: "Practical Method of Resistance Reduction Factor for Use in Reliability-based Assessment of Existing Structures"Proc.AIJ Tokai Chapter Architectural Research Meeting, AIJ. No.41. 161-164 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Mori, Y., M.Nonaka: "Load and Resistance Factors for the Assessment of Deteriorating Existing Structures"Structural Safety and Reliability. (CD-Rom). 8 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Mori, Y, T.Takada, H.Idota: "Practical Method to Determine Load and Resistance Factors Used in Limit State Design"Proc. of 1st ASRANet International Colloquium, Glasgow, Scotland. (CD-Rom). 14 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 加藤隆広, 森 保宏: "劣化関数の不確定性を考慮した信頼性評価手法"日本建築学会大会学術講演梗概集. B-1. 9-10 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 加藤隆広, 森 保宏: "既存構造物の信頼性評価に用いる劣化影響係数の実用的評価手法"日本建築学会東海支部研究報告集. 第41号. 161-164 (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 野中桃子, 森 保宏, 尾崎隆司: "劣化影響係数を用いた既存構造物の信頼性評価"日本建築学会大会学術講演梗概集. B-1. 20013 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 加藤隆広, 森 保宏: "限界状態設計に用いる劣化影響係数の実用的評価手法"日本建築学会東海支部研究報告集. 第40号. 125-128 (2002)

    • Related Report
      2001 Annual Research Report

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

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