FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

Volume II DETERMINING SITE-SPECIFIC LOADS 8
EXAMPLE 8.10. LOAD COMBINATION EXAMPLE PROBLEM (concluded)
7. 0.6D + 0.6W + 1.5F a gives the appropriate factors to be used in calculating the factored
global overturning moment
From Illustration B:
• The portion of Zone A landward of the LiMWA
7. 0.6D + 0.6W + 0.75F a gives the appropriate factors to be used in calculating the factored
global overturning moment
From Illustration B:
Note: In this example, the required uplift capacity to resist overturning is estimated by evaluating the skin
friction capacity of the piles. The total pile uplift capacity is approximately 908,000 ft-lb. which exceeds
both calculated overturning moments and is based on the horizontal distance to each row of piles from the
pivot point and the following assumptions:
• Pile embedment: 19.33 ft
• Pile size: 10 in.
• Coefficient of friction: 0.4 for wood piles
• Density of sand: 128 lb/ft 3
• Coefficient of lateral pressure: 09.5
• Critical depth fir sand: 15 ft
• Angle of internal friction: 38°
• Scour depth: 5 ft
• Factor of safety: 2
COASTAL CONSTRUCTION MANUAL
8-79