2405.5.2 Unit Skylights rated for separate performance grades for positive and negative design pressure. The design of unit skylights rated for performance grade for both positive and negative design pressures shall be based on the following equations: (Equation Fgi ≤ PGPos (Glitch Mod S6085 / AS ) Fgo ≤ PGNeg (Equation 24-15) where: = Performance grade rating of the skylight under positive design PGPos pressure; = Performance grade rating of the skylight under negative design PGNeg pressure; and and are determined in accordance with the following: Fgi Fgo For 0.6 Wo ≥ D, where: = Outward wind force, psf (kN/m2) due to ultimate design wind speed Wo Vult, as calculated in Section 1609. = The dead weight of the glazing, psf (kN/m2) as determined in Section D 2404.2 for glass, or by the weight of the plastic, psf (kN/m2) for plastic glazing. = Maximum load on the skylight determined from Equations 24-3 and 24-4 Fgi in Section 2404.2. = Maximum load on the skylight determined from Equation 24-2. Fgo For < 0.6Wo D, where: Is the outward wind force, psf (kN/m2 ) due to ultimate design wind speed Wo= as calculated in Section 1609. Vult The dead weight of the glazing, psf (kN/m2) as determined in Section D= 2404.2 for glass, or by the weight of the plastic for plastic glazing.
2405.5.2 Unit Skylights rated for separate performance grades for positive and negative design pressure. The design of unit skylights rated for performance grade for both positive and negative design pressures shall be based on the following equations: Fgi ≤ PGPos (Equation Fgo ≤ PGNeg (Glitch Mod S6085 / AS ) (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 0.6 Wo ≥ D, where: Wo = Outward wind force, psf (kN/m2) due to ultimate design wind speed Vult, 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 0.6Wo < D, where: Wo= Is the outward wind force, psf (kN/m2 ) due to ultimate design wind speed Vult 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.