By Sturm, T.W. and Melville, B.W. and Ettema, R. and Program, N.C.H.R. and Board, T.R.
TRB's nationwide Cooperative road learn application (NCHRP) Web-Only record 181: review of Bridge-Scour study: Abutment and Contraction Scour procedures and Prediction examines bridge-abutment scour and the effectiveness of the prime tools used for estimating layout scour intensity.
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Extra info for Evaluation of Bridge-Scour Research: Abutment and Contraction Scour Processes and Prediction
The design and dimensions of a common standard-stub abutment column are shown in Figure 2-4. Wing-wall abutments usually have similar foundation layouts as the standard-stub abutments, except that they include wingwalls extending from the central stub. Figure 2-5 shows the design and dimensions of a common wing-wall abutment. 17 Figure 2-4. The geometry and dimensions of a standard-stub abutment commonly used for spillthrough abutments (prototype scale indicated); design provided by the Iowa DOT (Ettema et al.
The data obtained by Cardoso and Bettess (1999) and Fael et al. 4, where B is channel width. Lim (1997) and Lim and Cheng (1998b) have derived abutment scour formulas for clear-water and live-bed scour, respectively, in a rectangular channel. They assume that the flow rate through the scour hole area is the same before and after scour. Their clear-water scour formula agrees with the Melville formula and the Laursen abutment scour formula for the special case of an intermediate-length, vertical-wall abutment in a rectangular channel.
Either, or together, Scour Conditions A and B may eventually cause the approach embankment to undergo a slope-stability failure. If the embankment extensively washes out, so as to expose the abutment structure, scour may then develop at the abutment structure as if the abutment were a form of pier (Condition C). e. foundations of wing-walls should be deep enough that the wing-walls do not fail when exposed to a pier-like scour condition. For design estimation of scour depth, it is useful to consider the likely rates or sequences in which the three scour conditions developed, and to ask -- What is the greatest scour depth that reasonably could occur near the abutment?