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// CODE SNIPPET

1609.1.1 Determination of Wind Loads

Building Code 2018 of Illinois > 16 Structural Design > 1609 Wind Loads > 1609.1 Applications > 1609.1.1 Determination of Wind Loads
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Wind loads on every building or structure shall be determined in accordance with Chapters 26 to 30 of ASCE 7. The type of opening protection required, the basic design wind speed, V, and the exposure category for a site is permitted to be determined in accordance with Section 1609 or ASCE 7. Wind shall be assumed to come from any horizontal direction and wind pressures shall be assumed to act normal to the surface considered.

Exceptions:

  1. Subject to the limitations of Section 1609.1.1.1, the provisions of ICC 600 shall be permitted for applicable Group R-2 and R-3 buildings.
  2. Subject to the limitations of Section 1609.1.1.1, residential structures using the provisions of AWC WFCM.
  3. Subject to the limitations of Section 1609.1.1.1, residential structures using the provisions of AISI S230.
  4. Designs using NAAMM FP 1001.
  5. Designs using TIA-222 for antenna-supporting structures and antennas, provided that the horizontal extent of Topographic Category 2 escarpments in Section 2.6.6.2 of TIA-222 shall be 16 times the height of the escarpment.
  6. Wind tunnel tests in accordance with ASCE 49 and Sections 31.4 and 31.5 of ASCE 7.

The wind speeds in Figures 1609.3(1) through 1609.3(8) are basic design wind speeds, V, and shall be converted in accordance with Section 1609.3.1 to allowable stress design wind speeds, Vasd, when the provisions of the standards referenced in Exceptions 4 and 5 are used.

1609.1.1.1 Applicability

The provisions of ICC 600 are applicable only to buildings located within Exposure B or C as defined in Section 1609.4. The provisions of ICC 600, AWC WFCM and AISI S230 shall not apply to buildings sited on the upper half of an isolated hill, ridge or escarpment meeting all of the following conditions:

  1. The hill, ridge or escarpment is 60 feet (18 288 mm) or higher if located in Exposure B or 30 feet (9144 mm) or higher if located in Exposure C.
  2. The maximum average slope of the hill exceeds 10 percent.
  3. The hill, ridge or escarpment is unobstructed upwind by other such topographic features for a distance from the high point of 50 times the height of the hill or 2 miles (3.22 km), whichever is greater.

Related Code Sections


1609.1.1 Structural Design, Determination of Wind Loads
Wind loads on every building or structure shall be determined in accordance with Chapters 26 to 30 of ASCE 7. The type of opening protection required ...
Building Code 2018 of Illinois > 16 Structural Design > 1609 Wind Loads > 1609.1 Applications > 1609.1.1 Determination of Wind Loads
2404.1 Glass and Glazing, Vertical Glass
be designed to resist the wind loads due to basic design wind speed, V , in Section 1609 for components and cladding. Glass in glazed curtain walls, glazed ...
Building Code 2018 of Illinois > 24 Glass and Glazing > 2404 Wind, Snow, Seismic and Dead Loads on Glass > 2404.1 Vertical Glass
1810.3.3.1.5 Soils and Foundations, Uplift Capacity of a Single Deep Foundation Element
the ultimate load capacity as determined in Section 1810.3.3.1.2, using the results of load tests conducted in accordance with ASTM D3689, divided ...
Building Code 2018 of Illinois > 18 Soils and Foundations > 1810 Deep Foundations > 1810.3 Design and Detailing > 1810.3.3 Determination of Allowable Loads > 1810.3.3.1 Allowable Axial Load > 1810.3.3.1.5 Uplift Capacity of a Single Deep Foundation Element
2405.5.2 Glass and Glazing, Skylights Rated for Separate Performance Grades for Positive and Negative Design Pressure
) as determined in Section 2404.2 for glass, or by the weight of the plastic, psf (kN/m 2 ) for plastic glazing. F gi = Maximum load ...
Building Code 2018 of Illinois > 24 Glass and Glazing > 2405 Sloped Glazing and Skylights > 2405.5 Unit Skylights and Tubular Daylighting Devices > 2405.5.2 Skylights Rated for Separate Performance Grades for Positive and Negative Design Pressure
Section 1602 Structural Design, Notations
speeds, miles per hour (mph) (km/hr) determined from Figures 1609.3(1) through 1609.3(8) or ASCE 7. W = Load due to wind pressure. W i ...
Building Code 2018 of Illinois > 16 Structural Design > 1602 Notations
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