We can calculate the weight of this U – section in the same way as we calculated for L section
Here, we will have to know the outer and inner edge dimensions.
Volume of the U section = cross-sectional area × Length
V = A × L = (( X1 × Y1 ) – ( x2 × y2 )) × L
Where X1 is outer edge width, Y1 is outer edge height and x2 is inner edge width, y2 is inner edge height.
Let us consider a 1 m long U section of outer edge width 30mm = 0.030m, outer edge height = 20 mm = 0.020 m and inner edge width 20 mm = 0.020 m, inner edge height = 15 mm = 0.015 m.
So, Volume of the U section = [ ( 0.030 × 0.020 ) – ( 0.020 × 0.015 ) ] x 1 = 0.0003 m3
Hence, mass of the U section = density × volume = 7900 × 0.0003 = 2.37 kg
By using this formula we can calculate the mass of u section beam of different dimensions.