Sample Design Calculations Page 19
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37C
SAMPLE DESIGN CALCULATIONS
APPENDIX
EXAMPLE C3. LOAD COMBINATIONS (concluded)
The most likely overturning direction is along the short dimension of the building caused by seismic
forces. The ASD factor for the seismic force is 0.7 and the ASD factor for the dead weight of the
building is 0.6 per load combination 8.
for building to resist overturning
Summing the moments about the pivot point:
OK, building weight keeps building from overturning.
Therefore, the structure can resist overturning.
Solution for #3: Check if the structure can resist uplift and buoyancy forces as follows:
• Controlling condition for uplift and buoyancy: The dead weight of the building must resist
the uplift forces imposed by wind and buoyancy on the building. The sum of the forces in the
vertical direction must be greater than the buoyancy force in order for the building to stay in
the ground. load combination 7 is most conservative. Buoyancy factored as flood load.
to resist uplift and buoyancy.
Per Example C1, the elevated structure is incapable of resisting buoyancy forces and flood
openings are required.
NOTE: For this example analysis, the existing structural components were assumed to be ade quate for the
loading conditions. However, the designer should check the existing truss-to-wall-connections, plywood roof
diaphragm, upper level walls, and floor diaphragm for their ability to resist increased loadings.
C-19
ENGINEERING PRINCIPLES AND PRACTICES for Retrofitting Flood-Prone Residential Structures
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