UFC 4-151-10
10 September 2001
CHAPTER 5
SPECIAL CONSIDERATIONS
5-1
SERVICE LIFE. Unless specifically intended for a limited service life, or
unless otherwise stipulated in job-specific criteria, design structures for a service life of 25
years. Where a service life of 1 year or less is intended, design may be predicated on an
overall load factor of 1.15 for dead plus live load combined with any other single load; or
1.10 when combined with two or more other loads. Load factors for designs are intended
for limited service life.
Estimating Service Life. Assume structures detailed in accordance with this
handbook meet the service life requirement in paragraph 5-1.
Accessibility. Since waterfront structures frequently serve longer than 25
years, detail so that all components with an anticipated service life of less
than 50 years can be inspected and repaired or replaced.
5-2
CORROSION OF STEEL. The principal factors affecting rate of corrosion
loss are:
Geographical location,
Localized zones relative to tidal planes,
Exposure to salt spray,
Sand, earth, or other cover,
Protective coating(s),
Abrasive conditions (surf zone versus deep water),
Stray electric currents, and
Soil type.
5-2.1
expected periods of protection afforded by various coating systems.
5-2.2
Tropical Climates. Encase steel H-piling in concrete in and above the tidal
range and to a minimum depth of 1.5 m (5 ft) below MLW. Cap steel sheet piling with
concrete rather than with a steel channel or timber.
5-1
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