D1.J.3 Design Parameters
The program contains a large number of parameter names which are required to perform design and code checks. These parameter names, with their default values, are listed in Table 22A.1. These parameters communicate design decisions from the engineer to the program.
The default parameter values have been selected such that they are frequently used numbers for conventional design. Depending on the particular design requirements for an analysis, some or all of these parameter values may have to be changed to exactly model the physical structure. For example, by default the KZ
value (k value in local z-axis) of a member is set to 1.0, wile in the real structure it may be 1.5. In that case, the KZ
value in the program can be changed to 1.5, as shown in the input instruction (Section 5). Similarly, the TRACK
value of a member is set to 0.0, which means no allowable stresses of the member will be printed.
Parameter Name | Default Value | Description |
---|---|---|
CODE | - |
Must be specified as Design code to follow. See TR.48.1 Parameter Specifications. |
BEAM | 1.0 |
Beam parameter:
|
CB | 1.0 |
Cb value as used in Section 1.5 of AISC 0.0 = Cb value to be calculated Any other value will mean the value to be used in design |
CMY CMZ |
0.85 for sidesway and calculated for no sidesway | Cm value in local y & z axes |
DMAX | 100.0 in | Maximum allowable depth |
DMIN | 0.0 | Minimum allowable depth |
FSJ | 1.6 | Factor of safety used for joint checks. |
FYLD | 36 ksi | Yield strength of steel. |
KY | 1.0 | K value in local y-axis. Typically the minor axis. |
KZ | 1.0 | K value in local z-axis. Typically the major axis. |
LY | Member Length | Length in local Y-axis to calculate slenderness ratio. |
LZ | Member Length | Length in local Z-axis to calculate slenderness ratio. |
MAIN | 0.0 |
Design for slenderness.
|
NSF | 1.0 | Net section factor for tension members. |
RATIO | 1.0 | Permissible ratio of the actual to allowable stresses |
SSY | 0.0 |
Design for sidesway.
|
SSZ | 0.0 | Design for sidesway in local z-axis |
TRACK | 0.0 |
Controls the level of detail in the output:
|
UNF | 1.0 | Unsupported length provided as a
fraction of actual member length used for lateral-torsional buckling
calculation. Note: If both
UNF
and UNL parameters are specified, the effective length used
is UNF ×UNL . |
UNL | Member Length | Unsupported length for calculating allowable bending stress. Used for the lateral-torsional buckling calculation. Value should be in the current units of length. |
WELD | 1 |
Weld type, as explained in section 3.1.1 of the API code.
|
WMIN | 1.16 in. | Minimum thickness |
WSTR | 0.4 X FLYD
|
Allowable welding stress |
DMAX
and DMIN
are only used for member selection.