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 

BEAM  1.0 
0.0 = Design at ends and those locations specified by the SECTION command. 1.0 = Design at ends and every 1/12^{th} point along the member length. 
CB  1.0 
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. 
CMY CMZ 
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. 
KY  1.0 
Effective length factor to calculate slenderness ratio for buckling about local yaxis. Usually this is the minor axis. 
KZ  1.0 
Effective length factor to calculate slenderness ratio for buckling about local zaxis. Usually this is the major axis. 
LY  Member Length  Length to calculate slenderness ratio for buckling about local Y axis. 
LZ  Member Length  Same as above except in local zaxis. 
MAIN  0.0 
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. 
PUNCH 
1.0 = KOverlap 2.0 = KGap 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. 
SSY  0.0 
0.0 =Sidesway in local yaxis. 1.0 =No sidesway in local yaxis 
SSZ  0.0 
0.0 =Sidesway in local zaxis. 1.0 =No sidesway in local zaxis. 
STIFF  Greater of member length or depth of beam.  Spacing of stiffeners for plate girder design in current length units. 
TRACK  0 
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 