FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

Volume II DESIGNING THE BUILDING 9
9.2 Other Load Path Considerations
Several additional design considerations must be investigated in order for a design to be complete. The details
of these investigations are left to the designer, but they are mentioned here to more thoroughly cover the
subject of continuous load paths and to point out that many possible paths require investigation.
Using the example of the building shown in Example 9.3, Illustration A, the following load paths should
also be investigated:
Load paths for shear transfer between shear walls and diaphragms including uplift due to shear wall
overturning
Gable wall support for lateral wind loads
Uplift of the front porch roof
Uplift of the main roof section that spans the width of the building
Other factors that influence the building design and its performance are:
Connection choices
Building eccentricities
Framing system
Roof shape
9.2.1 Uplift Due to Shear Wall Overturning
The shear wall that contains Link #6 includes connections designed to resist overturning forces from wind
acting perpendicular to the ridge (see Example 9.7, Illustration A). Calculation of the overturning induced
uplift and compressive forces are given in Example 9.7.
EXAMPLE 9.7. UPLIFT AND COMPRESSION DUE TO SHEAR WALL OVERTURNING
Given:
• Refer to Illustration A
• Wind speed = 150 mph, Exposure D
• Mean roof height = 33 ft
• Roof span perpendicular to ridge = 28 ft
• Roof pitch = 7:12
• Wall height = 10 ft
COASTAL CONSTRUCTION MANUAL
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