Offshore Structure Platform Design - Offshore Structures: Design, Construction and Maintenance - page 165

Chord saddle

2 2 0 : 5

sin 2 2 SCF = ½ Equation ð 3 : 112 Þ C 1 ð 0 : 8 α − 6 Þτβ ð 1 − β Þ + θ (3.117)

For short chord there is a correction factor F2:

2 0 : 04 exp ½ −

γ − 1 : 38 F2 = 1 − ð 1 : 43 β − 0 : 97 β − 0 : 03 Þγ 0 : 71 α 2 : 5 (3.118)

Chord crown

2

0 : 2

SCF = γ τ½ 2 : 65 + 5 ðβ − 0 : 65 Þ + τβð C 2 α − 3 Þ sin θ (3.119)

Brace saddle: Equation (3.115)
Brace crown
SCF

1 : 2 2

= 3 + γ ½ 0 : 12exp ð− 4 βÞ + 0 : 011 β − 0 : 045 + βτð C 3 α − 1 : 2 Þ (3.120)

Note that, for chord-end fixity parameter C, 0.5 ≤ C ≤ 1.0, and typically C =

0.7, C 1 =2(C − 0.5), C 2 = C/2 and C 3 = C/5.

In-Plane Bending

Chord crown

0 : 85

βÞ sin 0 : 7

= : βτ γð 1 − 0 : 68 θ (3.121)

SCF 1 45

For short chord there is a correction factor F3, where
F3

1 : 8

γ − 0 : 89

1 : 8

= 1 − 0 : 55 β γ 0 : 16 exp ½− 0 : 49 α (3.122)

Brace crown

0 : 4

sin ð 0 : 06 γ − 1 : 16 Þ SCF = 1 + 0 : 65 βτ γð 1 : 09 − 0 : 77 βÞ + θ (3.123)

Out-of-Plane Bending