Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hydraulic Loading for Bridges Founded on Rock
Instantaneous stream power is defined as the product of shear stress and stream velocity representing the scouring condition. Hydraulic loading conditions are being expressed in terms of stream power which can be accumulated over the life of a bridge structure. The prediction of scour in erodible rock must consider the hydraulic loading imposed over many years over all the flood events over those years. This is true whether or not a threshold condition must be exceeded before the rock in the streambed is exposed to erosive forces. Long-term observations of scour in erodible rock combined with a history of hydraulic loading (expressed as stream power) provide a valuable index of the relative erodibility of the particular rock formation. An index, herein described as the Scour Number Ks, is defined as the amount of scour observed over a period of time divided by the cumulative hydraulic load over the same period. Given a future cumulative hydraulic loading, the Scour Number can be used to estimate the future scour associated with that loading, for the particular rock formation. Probability weighted flood frequency captures the range of flow conditions and is converted to average annual scour.
Hydraulic Loading for Bridges Founded on Rock
Instantaneous stream power is defined as the product of shear stress and stream velocity representing the scouring condition. Hydraulic loading conditions are being expressed in terms of stream power which can be accumulated over the life of a bridge structure. The prediction of scour in erodible rock must consider the hydraulic loading imposed over many years over all the flood events over those years. This is true whether or not a threshold condition must be exceeded before the rock in the streambed is exposed to erosive forces. Long-term observations of scour in erodible rock combined with a history of hydraulic loading (expressed as stream power) provide a valuable index of the relative erodibility of the particular rock formation. An index, herein described as the Scour Number Ks, is defined as the amount of scour observed over a period of time divided by the cumulative hydraulic load over the same period. Given a future cumulative hydraulic loading, the Scour Number can be used to estimate the future scour associated with that loading, for the particular rock formation. Probability weighted flood frequency captures the range of flow conditions and is converted to average annual scour.
Hydraulic Loading for Bridges Founded on Rock
Mishra, Su K. (Autor:in) / Keaton, Jeffrey R. (Autor:in) / Clopper, Paul E. (Autor:in) / Lagasse, Peter F. (Autor:in)
International Conference on Scour and Erosion (ICSE-5) 2010 ; 2010 ; San Francisco, California, United States
Scour and Erosion ; 734-742
29.10.2010
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Hydraulic Loading for Bridges Founded on Rock
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