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Scour Countermeasure
Economic Analysis
To compliment its work in relating to scour at bridge structures, the
Federal Highway Administration's Turner-Fairbank Highway Research Center J. Sterling Jones Hydraulics Research Laboratory is developing methodology to assist bridge engineers assess
the economic feasibility of implementing alternative countermeasures.
The
method deals with:
- Loss
of life
- Preclusion
of loss of life
- Structure's
expected remaining lifespan
- Cost
of countermeasures
- Future
value of present costs
- Present
value of future costs
- Annual
scour failure probability
- Expected
lifetime scour failure probability
The
method allows economic evaluation and comparison of potential
countermeasures (or of doing nothing) on the basis of total economic
benefit, net benefit, cost, or benefit-to-cost ratio.
These algorithms
have been codified in an extension to the HYRISK
Software to make them easy to use and to assist in providing estimates
for parameters required by the method for which values are not otherwise
known.
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