D1.L.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. For example, by default the KZ value (k value in local z-axis) of a member is set to 1.0, while 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. If the allowable stresses are to be printed, the TRACK value must be set to 1.0.
|Parameter Name||Default Value||Description|
Must be specified as NF3000 1989.
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.
|CT||0.75||Reduction Coefficient in computing effective net area of an axially loaded tension member. [Refer NF-3322.8(c)(1)(d)]|
|0.85 for sidesway and calculated for no sidesway||Cm value in local y & z axes|
|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, in current units. Used only with the MEMBER SELECTION command.|
|DMIN||0.0 inch||Minimum allowable depth, in current units. Used only with the MEMBER SELECTION command.|
|FYLD||36 KSI||Yield strength of steel at temperature in current units.|
|FU||60 KSI||Ultimate tensile strength of steel in current units.|
Stress Limit Factor applicable to the Design Allowable Compressive Axial and Bending stresses to determine the Buckling Limit.
Stress Limit Factor applicable to the Design Allowable Tensile and Bending Stresses.
Stress Limit Factor applicable to the Design Allowable Shear Stresses.
|KY||1.0||K value in local y-axis. Usually, this is minor axis.|
|KZ||1.0||K value 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).|
0.0 = check for slenderness
1.0 = suppress slenderness check
|NSF||1.0||Net Section Factor for tension member.|
|PROFILE||None||Used in member selection. See TR.48.1 Parameter Specifications for details.|
|RATIO||1.0||Permissible ratio of the actual to allowable stresses.|
Service level, which defines the service level factors to use for modifying stress values for the service level conditions.
Refer to D1.L.5. ASME NF 3000 Service Level Conditions for additional information.
|STIFF||Member length or depth whichever is greater||Spacing of stiffeners for plate girder design|
0.0 = Normal Steel
1.0 = Austenitic Stainless Steel
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.|