D1.K.2.3 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 the following table.
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
|Parameter Name||Default Value||Description|
Must be specified as AISC N690 1984 to use the ANSI/AISC N690-1984 code for checking purposes.
Design code to follow. See TR.48.1 Parameter Specifications.
Used for Deflection Check only.
Bending coefficient dependent upon moment gradient
0.0 = CB is calculated itself
Any other user-defined value is accepted.
|0.85 for sidesway and calculated for no sidesway||Cm value in local y & z axes|
|CT||0.75||Reduction Coefficient in computing net effective net area of an axially loaded tension member.|
|DFF||None(Mandatory for deflection check)||"Deflection Length" / Maximum allowable local deflection|
|DJ1||Start Jointof member||Joint No. denoting starting point for calculation of "Deflection Length"|
|DJ2||End Joint of member||Joint No. denoting end point for calculation of "Deflection Length"|
|DMAX||45 inch||Maximum allowable depth|
|DMIN||0.0 inch||Minimum allowable depth|
|FU||60 KSI||Ultimate tensile strength of steel in current units.|
|FYLD||36 KSI||Yield strength of steel in current units.|
|KY||1.0||Effective Length Factor for Compression in local y-axis. Usually, this is minor axis.|
|KZ||1.0||Effective Length Factor for Compression in local z-axis. Usually, this is major axis.|
|LY||Member Length||Length to calculate slenderness ratio for buckling about local Y axis.|
|LZ||Member Length||Same as above except in z-axis (major).|
Design for slenderness.
|NSF||1.0||Net section Factor for tension members|
Used to search for the lightest section for the profile(s) specified for member selection. See TR.48.1 Parameter Specifications for details.
|RATIO||1.0||Permissible ratio of the actual to allowable stresses.|
|SFC||1.0||Stress limit coefficient for compression (SLC) as found in Table Q 184.108.40.206.|
|SFT||1.0||Stress limit coefficient for tension (SLC) as found in Table Q 220.127.116.11.|
|SMY||1.0||Stress limit coefficient for minor axis bending (SLC) as found in Table Q 18.104.22.168.|
|SMZ||1.0||Stress limit coefficient for major axis bending (SLC) as found in Table Q 22.214.171.124.|
|STIFF||Member length or depth whichever is greater||Spacing of stiffeners for plate girder design|
240 for main member
300 for "Truss" member
|Slenderness limit under tension|
Controls the levels of detail to which results are reported.
|UNB||Member Length||Unsupported length of the bottom* flange for calculating allowable bending compressive stress. Will be used only if flexural compression on the bottom flange.|
|UNT||Member Length||Unsupported length of the top* flange for calculating allowable bending compressive stress. Will be used only if flexural compression on the top flange.|