UFC 4-151-10
10 September 2001
CHAPTER 3
DECK AND SUBSTRUCTURE FRAMING AND BRACING
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SUBSTRUCTURE. The substructure includes pile caps, under-deck
bracing, and other structural members (other than stringers) at and below the level of the
pile caps.
3-1.1
Pile Caps - All Types. The effects of differential axial deformation among
piles must be investigated where:
heavy concentrated loads occur,
piles are long,
there is an appreciable variation in pile lengths
pile types or installation methods vary.
Differential deformations will not appreciably affect ultimate strength if the
cap can deform elastically without buckling or fracture.
3-1.2
Timber
3-1.2.1
Hardware and Fittings. For requirements pertaining to hardware and
fittings, refer to Chapter 4.
3-1.2.2
Species and Preservative Treatment. Except for temporary structures,
give substructure timbers a preservative treatment. Use a species that will accept deep
treatment such as Southern pine or Douglas fir. Do not use untreated timber for
permanent structures. Resistance to borers and decay of any untreated lumber - even of
species presumed to be of superior resistance - is still inadequate for long-term use.
Encase species that do not accept preservative treatment.
3-1.2.3
3-1.2.4
Minimum Dimension. The minimum nominal timber size should be 76 mm
(3 in). National Fire Protection Association requires the following minimum dimensions:
cross bracing 102 mm (4 in); pile caps 203 mm (8 in); stringers 152 mm (6 in); and
decking 102 mm (4 in) with stringers, 76 mm (3 in) without stringers.
3-1.2.5
preservatives, conform to requirements of AWPA Standard MLP.
3-1.3
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