FIELD AND LABORATORY INVESTIGATION OF BRIDGE ABUTMENT. FINAL REPORT

Efficient highway bridge design requires a good understanding of channel bottom scour around the pier and the abutment foundations. While research on bridge pier hydraulics has resulted in reliable equations for estimating the depth of pier scour, bridge abutment scour depth equations have so far proved to be not completely reliable when applied to field problems. We were able to develop a method that depends on simple fluid principles of uniform horizontal shear distribution, numerical solution of the Laplace equation for 2-dimensional flow around bridge abutments, adjustment of empirical parameters by comparison to laboratory measurements, and the assumption of a fully mobile bed sediment movement. The theoretical development results in a prediction of dimensionless scour depth as a simple function of the stream tube contraction at the upstream corner of the abutment. The prediction equation, when compared to laboratory experimental results and a standard regression equation, showed consistent results. When a direct comparison can be made, the prediction equation seemed to give more reasonable results and predicted less scour than that of the standard regression equation. Case studies of two highway bridge crossings near Fairbanks, Alaska, showed that the prediction technique has promise as a practical method for evaluating channel scour at bridge abutments.

Language

  • English

Media Info

  • Features: Appendices; Figures; Tables;
  • Pagination: 126 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00720209
  • Record Type: Publication
  • Report/Paper Numbers: SPR-UAF-92-2, INE/TRC 94.21
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 17 1996 12:00AM