FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

Volume II DETERMINING SITE-SPECIFIC LOADS 8
EXAMPLE 8.6. LATERAL DIAPHRAGM LOADS FROM WIND PERPENDICULAR TO
RIDGE (continued)
• w = wall
Wall interior zone
the same direction)
Wall end zone
in the same direction)
COASTAL CONSTRUCTION MANUAL
(note that leeward and windward forces are acting in
(note that leeward and windward forces are acting
Under the procedures and notes shown in Figure 28.4-1 of ASCE 7-10, end zones extend a
minimum of 3 ft at each end of the wall. For long or tall walls, end zone lengths are based on
10 percent of the least horizontal dimension or 40 percent of the mean roof height, whichever is
smaller, but not less than either 4 percent of the least horizontal dimension or 3 ft at each end of
the wall. The end zone width where the pressures are applied is 3 ft.
The average pressure on the wall is:
where:
24 ft = building length assumed to be equal to the roof span for purposes of accounting for
average effects of pressure differences at end zones and interior zones
Roof interior zone
the same direction)
Roof end zone
(note that leeward and windward forces are acting in
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