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Bridge pressure Flow scour at Clear Water Threshold Condition

Transactions of Tianjin University 2009年第2期15卷 79-94页

作者：郭俊克 KERENYI Kornel PAGAN-ORTIZ Jorge E FLORA Kevin Department of Civil Engineering University of Nebraska-Lincoln PKI 204D 1110 S 67th ST Omaha NE 68182-0178 USA Office of Infrastructure R&D Turner-Fairbank Highway Research Center Federal Highway Administration 6300 Georgetown Pike McLean VA 22101 USA Office of Bridge Technology Federal Highway Administration 1200 New JerSey Avenue SE Washington DC 20590 USA California Department of Transportation (Caltrans) P. O. Box 942873 Sacramento CA 94273-0001 USA

Bridge pressure flow scour at clear water threshold condition is studied theoretically and *** flume experiments reveal that the measured scour profiles under a bridge are more or less 2-dimensional;all the measured scour profiles can be described by two similarity equations,where the horizontal distance is scaled by the deck width while the local scour by the maximum scour depth;the maximum scour position is located just under the bridge about 15% deck width from the downstream deck edge;the scour begins at about one deck width upstream the bridge while the deposition occurs at about 2.5 deck widths downstream the bridge;and the maximum scour depth decreases with increas-ing sediment size,but increases with deck *** theoretical analysis shows that:bridge scour can be divided into three cases,*** unsubmerged,partially submerged,and totally *** downstream unsubmerged flows,the maximum bridge scour depth is an open-channel problem where the conventional methods in terms of critical velocity or bed shear stress can be applied;for partially and totally submerged flows,the equilibrium maximum scour depth can be described by a scour and an inundation similarity number,which has been confirmed by experiments with two decks and two sediment *** application,a design and field evaluation procedure with examples is presented,including the maximum scour depth and scour profile.

关键词： bridge decks bridge design bridge foundations bridge hydraulics bridge inundation bridge scour pressure flows pressure scour submerged flows.

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