Page 583 - 2018_Complete_14_Collection (1)_Neat

GLASS AND GLAZING

The design of vertical glazing shall be based on Equation tions shall be designed to resist the wind loads in Section
24-1. 1609 for components and cladding according to the fol-
lowing equation:
0.6F  F (Equation 24-1)
ga
gw
0.6F < 0.5 F (Equation 24-6)
where: gw ge
F = Wind load on the glass due to basic design wind speed, where:
gw
V, computed in accordance with Section 1609. F = Wind load on the glass due to basic design wind
gw
F = Short duration load on the glass as determined in speed, V, computed in accordance with Section
ga
accordance with ASTM E1300. 1609.
2404.2 Sloped glass. Glass sloped more than 15 degrees F = Nonfactored load from ASTM E1300 using a
ge
(0.26 rad) from vertical in skylights, sunrooms, sloped roofs thickness designation for monolithic glass that is not
and other exterior applications shall be designed to resist the greater than the thickness of wired glass.
most critical combinations of loads determined by Equations 2404.3.2 Sloped wired glass. Wired glass sloped more
24-2, 24-3 and 24-4. than 15 degrees (0.26 rad) from vertical in skylights, sun-
spaces, sloped roofs and other exterior applications shall
F = 0.6W – D (Equation 24-2) be designed to resist the most critical of the combinations
o
g
F = 0.6W + D + 0.5 S (Equation 24-3) of loads from Section 2404.2.
i
g
F = 0.3 W + D + S (Equation 24-4) For Equations 24-2 and 24-3:
g
i
where: F < 0.5 F ge (Equation 24-7)
g
2
D = Glass dead load psf (kN/m ). For Equation 24-4:
For glass sloped 30 degrees (0.52 rad) or less from F < 0.3 F ge (Equation 24-8)
g
horizontal, where:
=13 t (For SI: 0.0245 t ). F = Total load on the glass as determined by Equations
g
g
For glass sloped more than 30 degrees (0.52 rad) from g 24-2, 24-3 and 24-4.
horizontal, F = Nonfactored load in accordance with ASTM E1300.
ge
=13 t cos  (For SI: 0.0245 t cos ). 2404.3.3 Vertical patterned glass. Patterned glass sloped
g
g
2
F = Total load, psf (kN/m ) on glass. 15 degrees (0.26 rad) or less from vertical in windows,
g
2
S = Snow load, psf (kN/m ) as determined in Section 1608. curtain and window walls, doors and other exterior appli-
t g = Total glass thickness, inches (mm) of glass panes and cations shall be designed to resist the wind loads in Sec-
plies. tion 1609 for components and cladding according to
2
W = Inward wind force, psf (kN/m ) due to basic design Equation 24-9.
i
wind speed, V, as calculated in Section 1609. F < 1.0 F ge (Equation 24-9)
gw
2
W = Outward wind force, psf (kN/m ) due to basic design where:
o
wind speed, V, as calculated in Section 1609. F = Wind load on the glass due to basic design wind
 = Angle of slope from horizontal. gw speed, V, computed in accordance with Section
Exception: The performance grade rating of unit skylights 1609.
and tubular daylighting devices shall be determined in F = Nonfactored load in accordance with ASTM E1300.
ge
accordance with Section 2405.5. The value for patterned glass shall be based on the
The design of sloped glazing shall be based on Equation thinnest part of the glass. Interpolation between
24-5. nonfactored load charts in ASTM E1300 shall be
permitted.
F  F ga (Equation 24-5) 2404.3.4 Sloped patterned glass. Patterned glass sloped
g
where: more than 15 degrees (0.26 rad) from vertical in skylights,
F = Total load on the glass as determined by Equations 24-2, sunspaces, sloped roofs and other exterior applications
g
24-3 and 24-4. shall be designed to resist the most critical of the combina-
F = Short duration load resistance of the glass as tions of loads from Section 2404.2.
ga
determined in accordance with ASTM E1300 for For Equations 24-2 and 24-3:
Equations 24-2 and 24-3; or the long duration load F < 1.0 F (Equation 24-10)
resistance of the glass as determined in accordance g ge
with ASTM E1300 for Equation 24-4. For Equation 24-4:
F < 0.6F (Equation 24-11)
2404.3 Wired, patterned and sandblasted glass. g ge
2404.3.1 Vertical wired glass. Wired glass sloped 15 where:
degrees (0.26 rad) or less from vertical in windows, cur- F = Total load on the glass as determined by Equations
g
tain and window walls, doors and other exterior applica- 24-2, 24-3 and 24-4.
556 2018 INTERNATIONAL BUILDING CODE ®
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