WEIGHT OF GRATINGS: 

The weight of grating refers to the theoretical weight of grating that has been end welded and surface treated, except for the one that has not been surface treated. The actual weight and theoretical weight will differ due to the differences in end welding, opening, and notch cutting.

When estimating the self-weight of gratings to be used for industrial platforms, as well as for delivery and pavment, the theoretical weight must be employed. The weight per square meter of grating must be estimated using the formula:

Wt=(b 1 t 1:N 1:+b 2 t 2 N 2 +2b 3 t 3) ρ μ x 10 -6

Wt—the weight of grating, kg/m 2

t1 —the width of the bearing bar, mm

b1 —the thickness of the bearing bar, mm

N1 —the number of bearing bars per meter of grating,

t2 —the width of the crossbar, mm

b2 —the thickness of the crossbar, mm

N2 —the number of cross bars per meter of the grating;

t3 —the width of the end flat bar, mm

b3 —the thickness of the end flat bar, mm

p—the density of the material, kg/m 3, the density of steel products are calculated as 7850kg/m 3 ;

u—weight increasing coefficient due to surface treatment, the coefficient of hot dip galvanizing and painting shall be calculated as 1.06.

1. The weight of the stair tread is calculated as per its theoretical weight, and the weight-increasing coefficient of hot dip galvanizing and painting is 1.06.

2. For other gratings that need special treatment, the weight should be calculated otherwise.