FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

8 DETERMINING SITE-SPECIFIC LOADS Volume II
EXAMPLE 8.4. FLOOD LOAD EXAMPLE PROBLEM (continued)
Solution for #7: Breaking wave height (H b ) at seaward row of pilings can be found as follows:
At seaward row of pilings, H b = (d s )(0.78) where d s = 4.6 ft from Solution #3
Solution for #8: Hydrodynamic (velocity flow) loads (F dyn ) on a pile (not in seaward row) can be
calculated using Equation 8.8 as follows:
On one pile:
where:
C d = 2.0 for a square pile
A =
= 1.99 slugs/ft 3
V = 12.2 ft/sec (because the building is on oceanfront, use the upper bound flow velocity
for calculating loads)
F dyn on one pile = 909 lb
Solution for #9: Breaking wave loads (F brkp) on seaward row of pilings can be found using
Equation 8.5 as follows:
F brkp on one pile
where:
for square piles
for saltwater
from Solution #7
F brkp on one pile = 868 lb
F brkp on seaward row of piles (i.e., 7 piles) = (625 lb)(7) = 6,076 lb
8-42 COASTAL CONSTRUCTION MANUAL