Fuzzy-random approach to debris model for riverbed scour depth investigation at bridge piers

L. Sgambi, Noemi Basso, E. Garavaglia

研究成果: Conference contribution

抜粋

The removal of sediment around bridge abutments and piers due to the erosive action of flowing water (i.e. scouring) is of the greatest concern to society. Currently it has been estimated that scour produced by rivers and streams causes about 60% of the total amount of bridge failures. Underestimating this natural process can seriously threaten the overall safety of the infrastructure. Several factors may affect the scour depth at bridge piers: flow intensity and sediment grading, flow depth, nature and occurrence of floods, side wall effects, sediment size, geometry and inclination of piers, etc. The depth of the scour hole in the sand adjacent to the bridge foundations can be estimated using theoretical models with hydraulic parameters. However, the uncertainty associated with the parameters involved in the evaluation (e.g. flow characteristics, debris, structural and geotechnical factors, etc.) makes it almost impossible to adopt a deterministic approach for the reliability analysis. Therefore, in order to properly assess the structural safety, both aleatory variability (i.e. due to randomness) and epistemic uncertainty (i.e. due to limited data and knowledge) must be considered. A fuzzyprobabilistic approach can take some of those uncertainties into account. This paper proposes an original method for modelling the debris action in river bridges. Based on fuzzy-random theory, both the aleatory variability related to the particle accumulation size and the epistemic uncertainty characterising fluvial hydraulics equations can be successfully modelled.

元の言語English
ホスト出版物のタイトルLife-Cycle Analysis and Assessment in Civil Engineering
ホスト出版物のサブタイトルTowards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018
編集者Dan M. Frangopol, Robby Caspeele, Luc Taerwe
出版者CRC Press/Balkema
ページ2017-2024
ページ数8
ISBN(印刷物)9781138626331
出版物ステータスPublished - 2019 1 1
イベント6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018 - Ghent, Belgium
継続期間: 2018 10 282018 10 31

出版物シリーズ

名前Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018

Conference

Conference6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018
Belgium
Ghent
期間18/10/2818/10/31

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Safety, Risk, Reliability and Quality

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  • これを引用

    Sgambi, L., Basso, N., & Garavaglia, E. (2019). Fuzzy-random approach to debris model for riverbed scour depth investigation at bridge piers. : D. M. Frangopol, R. Caspeele, & L. Taerwe (版), Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018 (pp. 2017-2024). (Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018). CRC Press/Balkema.