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|
Must be specified as API
Design code to follow. See TR.48.1 Parameter Specifications.
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
|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.|
Design for slenderness.
|NSF||1.0||Net section factor for tension members.|
|RATIO||1.0||Permissible ratio of the actual to allowable stresses|
Design for sidesway.
|SSZ||0.0||Design for sidesway in local z-axis|
Controls the level of detail in the output:
|UNF||1.0||Same as above provided as a fraction of actual member length|
|UNL||Member Length||Unsupported length for calculating allowable bending stress|
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|