MIL-HDBK-1025/5
Main walkways shall be 4 to 8 ft (1.2 - 2.4 m) wide.
c)
Pile trestles are generally used to support stringers and
d)
decking with cross and sway bracing installed.
Deck elevations shall be approximately 1 ft (.30 m) above
e)
extremely high water.
Construction of fixed-level berthing systems may be either
f)
timber, reinforced concrete, steel or aluminum. A timber superstructure is
preferred because of the ease with which attachments may be made after final
construction.
Berthing structures and components using factory-built units
g)
for easy field installation are mostly of tubular and pressed-steel
construction with either stamped metal or timber plank decks.
Covered berthing is especially adaptable to a fixed-pier
h)
system.
Utility lines shall be carried under the deck or along the
i)
stringers for supporting the roof.
See para. 2.3.4. for deck materials and surface.
j)
Vertical Loading. Design fixed structures for deck live loading of
2.3.3.2
not less than 50 pounds per square foot (psf) for fingers and 100 psf for main
walks and building floors. When vehicles are to be allowed on main walks, the
design loading shall be increased accordingly (refer to MIL-HDBK-1025/l).
Other Design Criteria.
Other design criteria shall be as provided
2.3.3.3
in MIL-HDBK-1025/l.
Typical Construction.
Figure 7 represents a typical fixed-pier
2.3.3.4
system.
Floating-Pier Berthing Systems
2.3.4
General considerations include:
General Considerations.
2.3.4.1
Many floating-pier systems are commercially available.
a)
Consider an appropriate and commonly used and tested system to suit specific
basin peculiarities.
In a floating-pier system, the basic framework that transmits
b)
unequal stresses imposed by current, wave action, and wind from one float to
another throughout the system is generally constructed of timber. Most other
materials cannot take the almost constant flexure to which the framing is
subject over prolonged periods without fatigue failure. Some metal stringer
systems have been designed with flexible connections which keep flexure below
the fatigue failure limit.
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