UFC 4-152-01
28 July 2005
and mooring. Typically, energy-absorbing piles are 18 in2 (1161 mm2) and
reaction piles (used with foam filled fenders) are 24 in (1548 mm2) square. The
fender piles are usually connected to a chock and wale system at the deck level
and supported by rubber fender units at the bullrail. In the working stress range,
there is a linear relationship between reaction force and deflection. Figure 5-5
shows a prestressed concrete fender pile installation. Additional guidance and
design aids for concrete fender piles is contained in TM 53-89-03 and CR
89.005. A test program conducted for concrete fender piles is documented in R-
927. Key findings were:
partial prestressing to 600 psi (4136.9 kPa) was sufficient to close
flexural cracks;
strands in a rectangular configuration confined by No. 3 ties with a
3-in (76 mm) pitch performed best; and
65 ft (19.8 m) lengths can be expected to perform well under cyclic
load with an ultimate energy capacity of 30 ft-kips (2 m/kN) and a
post ultimate capacity of more than 60 ft-kips (4 m/kN.)
110
Previous Page
