The Ohio Department of Transportation experienced intolerable movements of bridge abutments and adjacent approach slabs within a short time after construction of a new highway facility. Two accurate field surveys measured the extent and magnitude of the settlements against the data on embankment heights, subsoil conditions, type of abutment design, and other conditions. The first study, in 1961, indicated that 90 percent of the surveyed bridge abutments had settlements of 10 cm (4 in) or less and only 20 percent of the settlements were 2.5 cm (1.0 in) or less. In most cases, the abutments were supported on spread footings, without piles, in the approach embankment. Major revisions were incorporated in the design and construction specifications. The two most important ones were the use of piles at the abutments and the increase of compaction requirements for the embankments. The second survey was conducted in 1975 to evaluate the revised policies. These data indicated that 70 percent of the surveyed bridge abutments had no measurable settlements and 20 percent had minor settlements even though supported by piling. Generally, the measured settlements were within tolerable limits. In 1961, the average approach slab settlement was 6.5 cm (2.5 in) and in 1975, the average approach slab settlement was 5.0 cm (2.0 in). /Author/

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References;
  • Pagination: pp 12-17
  • Monograph Title: Tolerable Movement of Bridge Foundations, Sand Drains, K-test, Slopes and Culverts
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196574
  • Record Type: Publication
  • ISBN: 030902823X
  • Files: TRIS, TRB
  • Created Date: Aug 28 1979 12:00AM