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// CODE SNIPPET

2409.4 Design Formula

NYC Building Code 2008 > 24 Glass and Glazing > 2409 Glass in Floors and Sidewalks > 2409.4 Design Formula
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Glass in floors and sidewalks shall be designed to resist the most critical of the following combinations of loads:
Fg = 2Fu + D (Equation 24-11)
Fg = (8Fc /A) + D (Equation 24-12)
Fg = Fa + D (Equation 24-13)

Where:

A = Area of rectangular glass, ft2 (m2).
D = Glass dead load (psf) = 13 tg (for SI: 0.0245 tg, kN/m2).
tg = Total glass thickness, inches (mm).
Fa = Actual intended use load, psf (kN/m2).
Fc = Concentrated load, pounds (kN).
Fg = Total load, psf (kN/m2) on glass.
Fu = Uniformly distributed load, psf (kN/m2).

The design of the glazing shall be based on

Fg ≤ Fga (Equation 24-14)

where Fg is the maximum load on the glass determined from the load combinations above, and Fga is the maximum allowable load on the glass, computed by the following formula:
Fga = 0.67 c2 Fge (Equation 24-15)

Where:

Fge = Maximum allowable equivalent load, psf (kN/m2), determined from Figures 2404(1) through 2404(12) for the applicable glass dimensions and thickness; and
c2 = Factor determined from Table 2404.2 based on glass type.
The factor, c2, for laminated glass found in Table 2404.2 shall apply to two-ply laminates only. The value of Fa shall be doubled for dynamic applications.

Related Code Sections


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