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R301.2.1.2.1 Modifications to ASTM E 1996
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Section 6.2.2 of ASTM E 1996 shall be modified as follows:
6.2.2 Unless otherwise specified, select the wind zone based on the ultimate design wind speed, Vult as follows:
6.2.2.1 Wind Zone 1 - 130 mph (58 m/s) ≤ ultimate design wind speed, Vult < 140 mph (62.5 m/s), and Hawaii.
6.2.2.2 Wind Zone 2 - 140 mph (62.5 m/s) ≤ ultimate design wind speed, Vult < 150 mph (67m/s) at greater than one mile (1.6 km) from the coastline. The coastline shall be measured from the mean high water mark.
6.2.2.3 Wind Zone 3 - 150 mph (67 m/s) ≤ ultimate design wind speed, Vult ≤ 170 mph (76 m/s), or 140 mph (62.5 m/s) ≤ ultimate design wind speed, Vult ≤ 170 mph (76 m/s) and within one mile (1.6 km) of the coastline. The coastline shall be measured from the mean high water mark.
6.2.2.4 Wind Zone 4 - ultimate design wind speed, Vult > 170 mph (76 m/s).
Table 1 of ASTM E 1886 and ASTM E 1996 — add column and notes to read as follows:
Air Pressure Cycles
0.2 to 0.5 Ppos1
0.0 to 0.6 Ppos
0.5 to 0.8 Ppos
0.3 to 1.0 Ppos
0.3 to 1.0 Pneg2
0.5 to 0.8 Pneg
0.0 to 0.6 Pneg
0.2 to 0.5 Pneg
Notes:
- Ppos = 0.6 × positive ultimate design load in accordance with ASCE 7.
- Pneg = 0.6 × negative ultimate design load in accordance with ASCE 7.