D1.D.1.3 AASHTO (ASD) Design Parameters
The following table outlines the parameters that can be used with the AASHTO (ASD) code along with the default values used if not explicitly specified.
|Parameter Name||Default Value||Description|
0.0 = Design at ends and those locations specified by the SECTION command.
1.0 = Design at ends and every 1/12th point along the member length.
Cb value as used in the calculation of Fb
0.0 = Cb value to be calculated
Any other value will be used in the calculations.
|0.85 for sideswayand calculatedfor no sidesway||Cm value in local y & z axes|
|DFF||None.(Mandatory for a deflection check)||Deflection length / Maximum allowable local axis deflection.|
|DJ1||Start joint of member||Joint No. denoting starting point for calculating Deflection Length.|
|DJ2||End joint of member||Joint No. denoting ending point for calculating Deflection Length.|
|DMAX||1000.0||Maximum allowed section depth (in current length units) for a section to be selected with the SELECT command.|
|DMIN||0.0||Minimum allowed section depth (in current length units) for a section to be selected with the SELECT command.|
|FYLD||36 KSI||Yield strength of steel in current units.|
|LY||Member Length||Length to calculate slenderness ratio for buckling about local Y axis.|
|LZ||Member Length||Same as above except in local z-axis.|
0.0 =check for slenderness
1.0 =suppress slenderness check
|NSF||1.0||Ratio of "Net cross section area" / ‘Gross section area’ for tension member design.|
|PROFILE||None||Used in member selection. Refer to TR.48.1 Parameter Specifications for details.|
1.0 = K-Overlap
2.0 = K-Gap
3.0 = T and Y
4.0 = Cross with diaphragms
5.0 = Cross without diaphragms
|RATIO||1.0||Permissible ratio of the actual to allowable stresses.|
0.0 =Sidesway in local y-axis.
1.0 =No sidesway in local y-axis
0.0 =Sidesway in local z-axis.
1.0 =No sidesway in local z-axis.
|STIFF||Greater of member length or depth of beam.||Spacing of stiffeners for plate girder design in current length units.|
Level of detail in Output File:
|UNF||1.0||Unsupported length factor of the compression flange for calculating the allowable bending compressive strength.|
|UNL||Member Length||Unsupported length of compression flange for calculating allowable bending compressive stress.|
|WSTR||0.4 x FYLD||Allowable welding stress|