Sample Design Calculations Page 9
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37C
SAMPLE DESIGN CALCULATIONS
APPENDIX
EXAMPLE C2. CALCULATE LATERAL LOADS (continued)
In the “additional information” provided in the description of the house, the top of footing is 24 in.
below ground surface and the soil type is stiff residual clay (S = 82 lb/ft
per Table 4-3).
3
Calculate submerged soil and water forces per Equation 4-5.
lb/ft acting at 0.75 ft below ground surface
f
will be calculated in #2 to yield the force due to flowing water, using the equivalent hydrostatic
dh
method.
Finally, compute total lateral hydrostatic force using Equation 4-4, after removing the f
term
dh
(which is being used in #2).
22 lb/ft
Solution for #2: Since V < 10 ft/sec, use Eq. 4-7 to convert hydrodynamic force to equivalent
hydrostatic force
Determine drag coefficient C
by calculating
and using Table 4-5
d
0.70 ft
Convert the equivalent head to equivalent hydrostatic force.
From Equation 4-8:
C-9
ENGINEERING PRINCIPLES AND PRACTICES for Retrofitting Flood-Prone Residential Structures
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