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ASCE 27.1.5 and 28.3.4 require that the structure be designed for minimum wind loads due to 16 psf wind pressure for walls and 8 psf for roofs. and Commentary 27.1.5 and C28.3.4 state that minimum loads are to be applied “as a separate load case in addition to the normal load cases..”,
Therefore, regardless of the procedure selected, the program generates minimum wind loads, and compares the resulting forces to the Directional or Envelope forces on the shear line and chooses the heaviest for design on each shear line.
Minimum Intensity Override
Certain local design codes require a different minimum load, for example New York City requires 20 psf. Therefore, the program now allows you to adjust the intensity of the minimum load for walls and for roofs, with the defaults being 16 psf and 8 psf. These are input in the Site Information dialog box, and are recorded in the Site Information output table