FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

8 DETERMINING SITE-SPECIFIC LOADS Volume II
EXAMPLE 8.6. LATERAL DIAPHRAGM LOADS FROM WIND PERPENDICULAR TO
RIDGE (concluded)
the same direction)
The average pressure on the roof is:
(note that leeward and windward forces are acting in
The roof diaphragm will take its load plus half the load of the 8-ft-tall wall below.
Step 2: Floor Diaphragm
• The floor diaphragm loads are based on the maximum MWRFS coefficients associated with a
20-degree roof slope. It is assumed that the floor diaphragm tributary area is the height of one
8-ft wall plus 1 ft to account for floor framing depth.
Wall interior zone
the same direction)
Wall end zone
the same direction)
The average pressure on the wall is:
(note that leeward and windward forces are acting in
(note that leeward and windward forces are acting in
The floor diaphragm load is based on a 9-ft tributary height obtained from adding the height of one
8-ft wall plus 1 ft to account for the floor framing depth.
Note: This solution matches the information in Table 8-7.
8-60 COASTAL CONSTRUCTION MANUAL