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Evaluating scour at bridges.

File Language:
English


Details

  • Creators:
    Richardson, E.V. ; Davis, S.R.
  • Corporate Creators:
    Ayres Associates ; GKY & Associates
  • Subject/TRT Terms:
  • Publication/ Report Number:
    HEC 18
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    United States. Federal Highway Administration. Office of Technology Applications
  • Abstract:
    This document is the third of HEC 18, i.e., presents the state of knowledge and practice for the design, ; evaluation, and inspection of bridges for scour. It contains updated material not included in the second ; edition dated April 1993. This document is a revision to HEC 18 dated April 1993 which, in turn, was an ; update of HEC 18 dated Feburary 1991 and of the publication, "Interim Procedures for Evaluating Scour ; at Bridges," issued in September 1988 as part of the FHWA Technical Advisory T 5140.20, "Scour at ; Bridges." T 5140.20 has since been superseded by T 5410.23, "Evaluating Scour at Bridges" dated ; October 28,1991. This document contains revisions obtained from further scour-related developments ; and use of the 1993 edition of HEC 18 by the highway community. ; The principal change from the 1993 edition of HEC 18 is the use of metric (SI) units of measurement. ; Additional changes are: a discussion of backwater effects on contraction of scour and the use of the ; water surface or the energy grade line as the reference line for measuring contraction scour depths, ; addition of a coefficient to the pier scour equation to account for the armoring effect of large particle sizes ; in the bed material, and addition of an equation to compute the coefficient applied to the pier scour ; equation when there is an angle of attack. Figures have been added to clarify computation of pier scour ; for exposed footings, pile caps placed in the flow, multiple columns skewed to the flow, and a scour ; resulting from pressure flow. This document includes a method to compute scour depths for pressure flow ; when a bridge deck is submerged. A method to compute H for constricted tidal waterways is given ; along with the procedure used by Maryland SHD to evaluate scour for bridges over tidal waterways. A ; discussion of computer models to determine the value of the hydraulic variables for scour analysis of ; bridges over tidal waterways has been added and information on scour detection equipment has been ; updated based on recent research. Finally, minor errors in the text and figures have been corrected.
  • Format:
    PDF
  • Funding:
    DTFH61-93-C-00101
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/1024/dot_1024_DS1.pdf
  • File Type:
    Filetype[PDF - 4.71 MB]
  • Collection(s):
    Federal Highway Administration
  • Main Document Checksum:
    urn:sha-512:b419c36c492d775b618c5dc729ca484b7e6101fb460532de05084752ae3830577697838c680f050051cbcf83c41c7b5dc13faea969673afd509da9892cc41349
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