D12.B.3 Design Parameters
Design parameters communicate specific design decisions to the program. They are set to default values to begin with and may be altered to suite the particular structure.
Parameter Name | Default Value | Description |
---|---|---|
CODE | none |
Must be specified as NORSOK. |
BEAM | 0 |
Beam segment locations for design:
|
CMY | 0.85 | Reduction factor Cm corresponding to the Y axis. |
CMZ | 0.85 | Reduction factor Cm corresponding to the Z axis. |
DFF | None (Mandatory for deflection check) | "Deflection length"/maximum allowable local deflection. |
DJ1 | Start Joint of member | Joint No. denoting start point for calculation of deflection length |
DJ2 | End Joint of member | Joint No. denoting end point for calculation of deflection length |
DMAX | 100.0 [cm] | Maximum allowable depth of steel section. |
DMIN | 0.0 [cm] | Minimum allowable depth of steel section. |
FYLD | 235 [MPa] |
Yield strength of steel, fy (St37) |
FU | 420 [MPa] | Ultimate Tensile Strength of Steel |
HYD | 0.0 |
The Y-coordinate, current units, of the maximum water level with respect to the origin. Note: If SET Z UP command has been specified, then yi will be the Z co-ordinate of the max water level.
For HYD > 0, the value of max. hydrostatic pressure calculated is reported for each member in a TRACK 2.0 output. |
KY | 1.0 | Effective length factor, k, in local Y-axis, usually minor axis. |
KZ | 1.0 | Effective length factor, k, in local Z-axis, usually major axis. |
LSR | Length of Tubular between Stiffening Rings. This value is required to calculate Design Hoop Stress due to Hydrostatic Pressure to check Hoop Buckling as per clause 6.3.6.1. | |
LX | Effective length for lateral torsional buckling. | |
LY | Member Length | Length in local Y axis for slenderness value KL/r |
LZ | Member Length | Length in local Z axis for slenderness value KL/r |
MAIN | 0 |
Option to design for slenderness.
|
PSD | 0.0 | Water pressure at each section in absence of HYD. |
RATIO | 1.0 | Permissible ratio of the actual to allowable stresses. |
SGR | 0 |
Steel Grade per EC3 (EN 1993-1-1:2005):
|
TMAIN | 180.0 | Slenderness limit in tension. Slenderness limit is checked based the MAIN parameter. |
TRACK | 0 |
Output detail:
|
Notes
-
C1 and C2 Parameters
The default values of these coefficients are taken from Table 6-4 of N-004 and depend on the joint and load type:
Table 2. Default values for C1 and C2 parameters Joint Type C1 C2 T or Y joints under brace axial load 25 11 X joints under brace axial load 20 22 K joints under balanced axial load 20 22 All joints under brace moment loading 25 30
Example
Note: This is a partial example containing only the information pertaining to the NORSOK N-004 steel design code; used at the end of the input file.
* Check tubular members according NORSOK N-004 CODE NORSOK HYD 3.0 MEMB 1 TO 3 PSD 10 MEMB 7 10 SGR 2 MEMB 1 TO 3 7 10 TRACK 2 MEMB 1 TO 3 7 10 CHECK CODE MEMB 1 TO 3 7 10