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// CODE SNIPPET

1609.3 Ultimate Design Wind Speed

Building Code 2015 of Alabama > 16 Structural Design > 1609 Wind Loads > 1609.3 Ultimate Design Wind Speed
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The ultimate design wind speed, Vult, in mph, for the determination of the wind loads shall be determined by Figures 1609.3(1), 1609.3(2) and 1609.3(3). The ultimate design wind speed, Vult, for use in the design of Risk Category II buildings and structures shall be obtained from Figure 1609.3(1). The ultimate design wind speed, Vult, for use in the design of Risk Category III and IV buildings and structures shall be obtained from Figure 1609.3(2). The ultimate design wind speed, Vult, for use in the design of Risk Category I buildings and structures shall be obtained from Figure 1609.3(3). The ultimate design wind speed, Vult, for the special wind regions indicated near mountainous terrain and near gorges shall be in accordance with local jurisdiction requirements. The ultimate design wind speeds, Vult, determined by the local jurisdiction shall be in accordance with Section 26.5.1 of ASCE 7.

In nonhurricane-prone regions, when the ultimate design wind speed, Vult, is estimated from regional climatic data, the ultimate design wind speed, Vult, shall be determined in accordance with Section 26.5.3 of ASCE 7.



FIGURE 1609.3(1) ULTIMATE DESIGN WIND SPEEDS, vult, FOR RISK CATEGORY II BUILDINGS AND OTHER STRUCTURES



FIGURE 1609.3(2) ULTIMATE DESIGN WIND SPEEDS, vult, FOR RISK CATEGORY III AND IV BUILDINGS AND OTHER STRUCTURES



FIGURE 1609.3(3) ULTIMATE DESIGN WIND SPEEDS, vult, FOR RISK CATEGORY I BUILDINGS AND OTHER STRUCTURES

1609.3.1 Wind Speed Conversion

When required, the ultimate design wind speeds of Figures 1609.3(1), 1609.3(2) and 1609.3(3) shall be converted to nominal design wind speeds, Vasd, using Table 1609.3.1 or Equation 16-33.



where:

Vasd = Nominal design wind speed applicable to methods specified in Exceptions 4 and 5 of Section 1609.1.1.
Vult = Ultimate design wind speeds determined from Figures 1609.3(1), 1609.3(2) or 1609.3(3).

TABLE 1609.3.1
WIND SPEED CONVERSIONSa, b, c
Vult 100 110 120 130 140 150 160 170 180 190 200
Vasd 78 85 93 101 108 116 124 132 139 147 155
For SI: 1 mile per hour = 0.44 m/s.
  1. Linear interpolation is permitted.
  2. Vasd = nominal design wind speed applicable to methods specified in Exceptions 1 through 5 of Section 1609.1.1.
  3. Vult = ultimate design wind speeds determined from Figure 1609.3(1), 1609.3(2) or 1609.3(3).

Related Code Sections


1609.3 Structural Design, Ultimate Design Wind Speed
The ultimate design wind speed, V ult , in mph, for the determination of the wind loads shall be determined by Figures 1609.3(1), 1609.3(2 ...
Building Code 2015 of Alabama > 16 Structural Design > 1609 Wind Loads > 1609.3 Ultimate Design Wind Speed
R603.9.4.1 Wall Construction, Ultimate Design Wind Speeds Greater Than 126 mph
Where ultimate design wind speeds exceed 126 miles per hour (56 m/s), Exposure Category C walls shall be provided with direct uplift connections ...
Residential Code 2015 of Alabama > 6 Wall Construction > R603 Cold-Formed Steel Wall Framing > R603.9 Structural Sheathing > R603.9.4 Uplift Connection Requirements > R603.9.4.1 Ultimate Design Wind Speeds Greater Than 126 mph
R301.2.1.2.1 Building Planning, Application of ASTM E 1996
otherwise specified, select the wind zone based on the ultimate design wind speed, V ult , as follows: 6.2.2.1 Wind Zone 1—130 mph ≤ ultimate ...
Residential Code 2015 of Alabama > 3 Building Planning > R301 Design Criteria > R301.2 Climatic and Geographic Design Criteria > R301.2.1 Wind Design Criteria > R301.2.1.2 Protection of Openings > R301.2.1.2.1 Application of ASTM E 1996
2404.1 Glass and Glazing, Vertical Glass
be designed to resist the wind loads due to ultimate design wind speed, V ult , in Section 1609 for components and cladding. Glass in glazed curtain walls ...
Building Code 2015 of Alabama > 24 Glass and Glazing > 2404 Wind, Snow, Seismic and Dead Loads on Glass > 2404.1 Vertical Glass
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