Table 6 Amount and shape of steel used for different wall thicknesses.

From: Effect of single tube sections on the structural safety of Chinese solar greenhouse skeletons

Serial number

Main girder wall thickness/mm

Amount of steel (t)/kg

Form of a variable (L)/mm

T/(mm/kg)

1

30 × 60 × 1

684.23

35.913

0

2

30 × 60 × 1.5

925.12

29.635

0.2606

3

30 × 60 × 2

1162.3

27.079

0.1848

4

30 × 60 × 2.5

1395.9

25.787

0.1423

5

30 × 60 × 3

1625

24.834

0.1177