Opening diameter-to-height ratio γ

0.4

0.6

0.8

0.9

Opening height ( mm)

200

300

400

450

Opening spacing (mm)

700

700

700

700

Length of intermediate web-post (mm)

38.2

57.29

76.39

85.94

Number of opening holes

6

6

6

6

Load ratio

0.5

0.5

0.5

0.5

Fillet radius

50

75

100

112.5