UFC 4-152-01
28 July 2005
4-1.6
Plastics.
Fiberglass-reinforced plastics (FRP), ultra high molecular weight (UHMW)
plastics, and high-density polyethylene (HDPE) are being increasingly used in
waterfront construction. FRP grating and shapes are highly durable in the
marine environment when shielded from ultraviolet rays. UHMW plastics are
useful in fender systems design as rub strips where a high abrasion resistance
and low coefficient of friction are required. UHMW plastics are available in
various grades. The use of corrosion-resistant fiber reinforced plastic (FRP)
components including reinforcing bars, prestressing tendons, structural shapes,
and unidirectional or woven fabrics, are being developed and have been
successfully used in the repair of piers and wharves. Consider using these
materials when the situation warrants, but special attention must be given to the
design of connections. Carefully evaluate the use of FRP components as
structural elements for new construction.
4-2
ALLOWABLE STRESSES.
4-2.1
General.
Allowable stresses for materials used in pier and wharf construction generally
conform to industry standard codes for the type of material and the purposed
application unless modified herein. Allowable stresses for fender system design
are discussed in Chapter 5.
4-2.2
Timber.
Design timber structural elements in accordance with UFC 1-200-01. Allowable
stresses are generally not affected by preservative treatment. However, modulus
of rupture and modulus of elasticity are considerably reduced by preservative
treatment. When preservative treatment for fire retardation is used, the allowable
stresses should be reduced by 10 percent.
4-2.3
Steel.
Design steel structural elements in accordance with UFC 1-200-01.
4-2.4
Concrete.
Design concrete structural elements in accordance with UFC 1-200-01. For
prestressed concrete members, "zero" tension design is preferred. All reinforced
concrete deck members should meet the crack control requirements for severe
exposure.
4-2.5
Other Materials.
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