FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

8 DETERMINING SITE-SPECIFIC LOADS Volume II
EXAMPLE 8.5. ROOF UPLIFT CONNECTOR LOADS
Given:
• Roof span of 24 ft with 2-ft overhangs
• Roof/ceiling dead load of 10 psf
• Wind load based on 150 mph, Exposure C at 33-ft mean roof height
• Building is enclosed
• K z = 1.0 (velocity pressure exposure coefficient evaluated at height of 33 ft)
• K zt = 1.0 (topographic factor)
• K d = 0.85 (wind directionality)
Illustration A. Roof-to-wall uplift connection loads from wind forces
Find: The roof-to-wall uplift connection load using the envelope procedure for low-rise buildings (see
Figure 28.4-1 in ASCE 7-10).
Solution: The roof-to-wall uplift connection load can be found using the envelope procedure for lowrise
buildings as follows:
• The velocity pressure (q) for the site conditions is determined from Equation 8.13 as follows:
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