Wind Zones - ASCE 7 Low Rise Building Method

Tekla Structural Designer
2021
Tekla Structural Designer

Wind Zones - ASCE 7 Low Rise Building Method

At the end of the wind wizard, the system creates default zones for all the walls and roof panels for each of the defined wind directions.

If any errors have occurred in this process, a red cross appears next to Pressure Zones in the Project Workspace.

Wind Directions

Eight zone directions evenly spaced at 45 degree intervals about the longitudinal direction are defined as follows:

  • Long (B) 1 - (longitudinal direction + 22.5°, uses data for +X' principal axis)

  • Trans (A) 1 - (longitudinal direction + 67.5°, uses data for +Y' principal axis)

  • Trans (A) 1 - (longitudinal direction + 112.5°, uses data for +Y' principal axis)

  • Long (B) 4 - (longitudinal direction + 157.5°, uses data for -X' principal axis)

  • Long (B) 3 - (longitudinal direction + 202.5°, uses data for -X' principal axis)

  • Trans (A) 3 - (longitudinal direction + 247.5°, uses data for -Y' principal axis)

  • Trans (A) 2 - (longitudinal direction + 292.5°, uses data for -Y' principal axis)

  • Long (B) 2 - (longitudinal direction + 337.5°, uses data for +X' principal axis)

These enable the modeling of two sets of zones per principal axis with the correct reference corner in each case.

Wall Zones

The wind wizard automatically generates wall zones, where possible, for each Direction of MWFRS Being Designed and Reference Corner in accordance with Figure 28.4-1.

Roof Zones

The wind wizard automatically generates roof zones, where possible, for each Direction of MWFRS Being Designed and Reference Corner in accordance with Figure 28.4-1.

For flat roofs and for MWFRS parallel to the ridge line we assume Note 8 is not applicable.

Where Note 7 applies, we assume the dimension to the zone 2/3 boundary is measured horizontally.

Automatic Zoning

Automatic zoning only applies to all triangular roof panels and quadrilateral roof panels that are not concave, that is that all of the internal angles < 180°.

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