Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Scour at Bridge Foundations on Rock: Overview of NCHRP Project No. 24-29
National Cooperative Highway Research Program Project 24-29 focuses on time-rate and design depth of scour at bridge foundations on rock. Rock scour is related to five processes: 1) weathering, 2) dissolution, 3) cavitation, 4) plucking, and 5) abrasion. Guidance is provided for identifying scour processes which deserve evaluation. Quarrying and plucking is a threshold process governed by flow velocity, turbulence intensity and block size. Degradable rock scour is cumulative and expressed in terms of stream power which can be accumulated over time. Probability weighted flood frequency captures the range of flow conditions and is converted to average annual scour. Empirical scour number is defined as documented scour divided by cumulative stream power. Geotechnical scour number is calculated from modified slake durability test results. Design scour depth is probability weighted average annual scour times the remaining bridge life or cumulative stream power over a bridge life times the appropriate scour number.
Scour at Bridge Foundations on Rock: Overview of NCHRP Project No. 24-29
National Cooperative Highway Research Program Project 24-29 focuses on time-rate and design depth of scour at bridge foundations on rock. Rock scour is related to five processes: 1) weathering, 2) dissolution, 3) cavitation, 4) plucking, and 5) abrasion. Guidance is provided for identifying scour processes which deserve evaluation. Quarrying and plucking is a threshold process governed by flow velocity, turbulence intensity and block size. Degradable rock scour is cumulative and expressed in terms of stream power which can be accumulated over time. Probability weighted flood frequency captures the range of flow conditions and is converted to average annual scour. Empirical scour number is defined as documented scour divided by cumulative stream power. Geotechnical scour number is calculated from modified slake durability test results. Design scour depth is probability weighted average annual scour times the remaining bridge life or cumulative stream power over a bridge life times the appropriate scour number.
Scour at Bridge Foundations on Rock: Overview of NCHRP Project No. 24-29
Keaton, Jeffrey R. (Autor:in) / Mishra, Su K. (Autor:in) / Clopper, Paul E. (Autor:in)
International Conference on Scour and Erosion (ICSE-5) 2010 ; 2010 ; San Francisco, California, United States
Scour and Erosion ; 749-756
29.10.2010
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Scour at Bridge Foundations on Rock: Overview of NCHRP Project No. 24-29
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