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 1/12th 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 y-axis. Usually this is the minor axis. |
KZ | 1.0 |
Effective length factor to calculate slenderness ratio for buckling about local z-axis. 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 z-axis. |
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 = 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. |
SSY | 0.0 |
0.0 =Sidesway in local y-axis. 1.0 =No sidesway in local y-axis |
SSZ | 0.0 |
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. |
TRACK | 0 |
Level of detail in Output File:
|
UNF | 1.0 | Unsupported length provided as a fraction of actual member length used for lateral-torsional buckling calculation. |
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. |
WSTR | 0.4 x FYLD | Allowable welding stress |