Download Evaluation of Bridge-Scour Research: Abutment and by Sturm, T.W. and Melville, B.W. and Ettema, R. and Program, PDF

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

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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?

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