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2405.5.2 Skylights Rated for Separate Performance Grades for Positive and Negative Design Pressure
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The design of skylights rated for performance grade for both positive and negative design pressures shall be based on Equations 24-14 and 24-15.
Fgi and Fgo are determined in accordance with the following:
For 0.6Wo ≥ D,
For 0.6 Wo < D,
Fgi ≤ PGPos
(Equation 24-14)
Fgo ≤ PGNeg
(Equation 24-15)
where: | ||
PGPos | = | Performance grade rating of the skylight under positive design pressure; |
PGNeg | = | Performance grade rating of the skylight under negative design pressure; and |
Fgi and Fgo are determined in accordance with the following:
For 0.6Wo ≥ D,
where: | ||
Wo | = | Outward wind force, psf (kN/m2) due to basic design wind speed, V, as calculated in Section 1609. |
D | = | The dead weight of the glazing, psf (kN/m2) as determined in Section 2404.2 for glass, or by the weight of the plastic, psf (kN/m2) for plastic glazing. |
Fgi | = | Maximum load on the skylight determined from Equations 24-3 and 24-4 in Section 2404.2. |
Fgo | = | Maximum load on the skylight determined from Equation 24-2. |
For 0.6 Wo < D,
where: | ||
Wo | = | The outward wind force, psf (kN/m2) due to basic design wind speed, V, as calculated in Section 1609. |
D | = | The dead weight of the glazing, psf (kN/m2) as determined in Section 2404.2 for glass, or by the weight of the plastic for plastic glazing. |
Fgi | = | Maximum load on the skylight determined from Equations 24-2 through 24-4 in Section 2404.2. |
Fgo | = | 0. |
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