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SESAM
Program version 3.5
Framework
20-DEC-2007
B-3
length = length to be used
There are four available alternatives regarding calculation of the bending moments reduction factor according to Table 6-2, Notes: 1, i.e. alternative:
• (a): Cm = 0.85
• (b): for members with no transverse loading, Cm = 0.6 - 0.4 M1,Sd / M2,Sd
• (c): for members with transverse loading, Cm = 1.0 - 0.4 Nc,Sd / NE (but not > 0.85)
• (b) or (c): as above dependant of transverse load or not
To activate the calculation of moment reduction factor Cm, use the command:
ASSIGN STABILITY sel-mem MOMENT-REDUCTION-FACTOR method
where
sel-mem = members to be checked
method = NORSOK-A, NORSOK-B, NORSOK-C or NORSOK-B-C
If a non-supported method is selected (e.g. API-A), the Cm value is set to 1.0.
Material factor:
The default material factor γm used by Framework is 1.15. According to section 6.3.7 in the NORSOK
standard, the material factor is dependent of the stress level (and geometric conditions). For some design
conditions, e.g. accidental limit state or lifting analysis, it must be possible to specify the material factor to
be used. By changing the (default) material factor (DEFINE CONSTANTS MATERIAL-FACTOR mat-factor), the specified material factor will be used, and section 6.3.7 will be neglected.
For the following design resistances a material factor of 1.15 is used (unless the material factor is specified
by the user):
Nt,Rd = Axial tension (section 6.3.2)
Vrd = Beam shear force (section 6.3.5)
MT,Rd = Torsional moment (section 6.3.5)
However, the material factor presented in the print is the material factor calculated according to section
6.3.7 (unless the material factor is specified by the user).
The check performed to evaluate if the user has given a material factor different from the default value is to
check if the material factor differs from 1.15 by more than 0.0001. Hence, for a case where a user given
material factor of 1.15 shall be used (i.e. no automatic calculation) the user must specify a material factor
equal to e.g. 1.1502.
Members with two or more cross sections: