h b d t r r1
(cm 2 ) (kg/m)
5 50 37 4.5 7 7 3.5 6.93 5.44
6.3 63 40 4.8 7.5 7.5 3.75 8.444 6.63
8 80 43 5 8 8 4 10.24 8.04
10 100 48 5.3 8.5 8.5 4.25 12.74 10
12.6 126 53 5.5 9 9 4.5 15.69 12.37
14a 140 58 6 9.5 9.5 4.75 18.51 14.53
14b 140 60 8 9.5 9.5 4.75 21.31 16.73
16a 160 63 6.5 10 10 5 21.95 17.23
16 160 65 8.5 10 10 5 25.15 19.74
18a 180 68 7 10.5 10.5 5.25 25.69 20.17
18 180 70 9 10.5 10.