These changes affect how you determine wind uplift resistance.
Mean roof height asce 7.
For si 1 foot 304 8 mm.
Figure asce 7 95 walls figure asce 7 95 walls.
Asce 7 05 and asce 7 10 have three roof zones.
Figure asce 7 95 external pressure coefficients gcp for loads on building components and cladding for enclosed or partially enclosed buildings with mean roof height h less than or equal to 60 ft 18 m.
Asce 7 16 also.
Visually aama tir a15 14 illustrates the mean roof height as per the image below where h on the sloped roof is ridge height eave height 2.
See help glossary link above for explanation.
The simplified procedure is for building with a simple diaphragm roof slope less than 10 degrees mean roof height less than 30 feet 9 meters regular shape rigid building no expansion joints flat terrain and not subjected to special wind condition.
Gc p can be determined for a multitude of roof types depicted in figure 30 4 1 through figure 30 4 7 and figure 27 4 3 in chapter 30 and chapter 27 of asce 7 10 respectively.
The wind speeds correspond to 3 second gust speeds at 33 ft above ground for exposure c category.
Asce 7 16 wind velocity to pressure hover click labels see help images at bottom.
Explanation of asce 7 05 asce 7 10 and asce 7 16.
1 mile per hour 0 447 m s.
Asce 7 16 added another zone and it presents the potential to have four roof zones.
Mean roof height mrh ft this is needed to determine canopy pressure.
Pressure increases vary by zone and roof slope.
Mean roof height as defined in asce 7.
For intermediate values of vasd the height associated with the next higher value of vasd shall be used or direct interpolation is permitted.
Mean eave height ft select yes if within 90 of height at.
In some cases not shown in table 1 such as for zone 1 the revised coefficients produce an approximate doubling of roof pressures.
Mean roof height asce 7 per asce 7 the mean roof height h is defined as the average of the roof eave height and the height to the highest point on the roof surface except that for roof angles of less than or equal to 10 the mean roof height is permitted to be taken as the roof eave height.
The dimensions of the zones are mostly determined by a building s length and width.
This table compares results between asce 7 10 and asce 7 16 based on 140 mph wind speeds in exposure c using the smallest ewa at 15 foot mean roof height in zone 2.
Field perimeter and corner see figure 2.
Asce 7 10 provides two methods for wind load calculation.
Interior field perimeter and corner see figure 3.
A simplified procedure and an analytical procedure.
