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.