D14.C.7 Design Parameters

The design parameters outlined in table below may be used to control the design procedure. These parameters communicate design decisions from the engineer to the program and thus allow the engineer to control the design process to suit an application's specific needs.

The default parameter values have been selected such that they are frequently used numbers for conventional design. Depending on the particular design requirements, some or all of these parameter values may be changed to exactly model the physical structure.

Note: Once a parameter is specified, its value stays at that specified number until it is specified again. This is the way STAAD.Pro works for all codes.

Table 1. South African Steel Design Parameters
Parameter Name	Default Value	Description
CODE	-	Must be specified `SANS10162-1: 2011`. Design code to follow. See TR.48.1 Parameter Specifications.
BEAM	0	0 - Perform design at ends and those locations specified in the section command. 1 - Perform design at ends and 1/12th section locations along member length.
CAN	0	Deflection check for cantilever members. 0 - False 1 - True
CB	1.0	Greater than 0.0 and less than 2.5,Value of ω₂ (C1.13.6) to be used for calculation Equal to 0.0: Calculate ω₂
CMY	1.0	Values between 0.4 – 1 used for ω_1y (C1.13.8.5). Input beyond the values consider as 1.
CMZ	1.0	Values between 0.4 – 1 used for ω_1z (C1.13.8.5). Input beyond the values consider as 1.
DFF	0	Default is 0 indicating that deflection check is not performed
DJ1	0	Start node of physical member for determining deflected pattern for deflection check and should be set along with `DFF` parameter
DJ2	0	End node of physical member for determining deflected pattern for deflection check and should be set along with `DFF` parameter
DMAX	1,000	Maximum allowable depth
DMIN	0	Minimum required depth
FU	345 Mpa	Ultimate strength of steel
FYLD	300 Mpa	Yield strength of steel
KT	1.0	K value for flexural torsional buckling
KY	1.0	K value in local Y-axis, usually minor axis
KZ	1.0	K value in local Z-axis, usually major axis
LT	Member length	Length for flexural torsional buckling
LY	Member length	Length in local Y axis for slenderness value KL/r
LZ	Member length	Length in local Z axis for slenderness value KL/r
MAIN	0	Flag for controlling slenderness check 0 - For Check for slenderness. 1 - For Do not check for slenderness
NSF	1.0	Net section factor for tension members
RATIO	1.0	Permissible ratio of applied load to section capacity Used in altering the RHS of critical interaction equations
SSY	0	Sidesway parameter 0 - Sideway about local Y-axis. 1 - No sideway about local Y-axis.
SSZ	0	Sidesway parameter 0 - Sideway about local Z-axis. 1 - No sideway about local Z-axis.
STIFF	Member length	Center-to-center distance between transverse web stiffeners.
TRACK	0	Track parameter 0. Print the design output at the minimum detail level. 1. Print the design output at the intermediate detail level. 2. Print the design output at maximum detail level
UNB	Member Length	Unsupported length in bending compression of bottom flange for calculating moment resistance
UNT	Member Length	Unsupported length in bending compression of top flange for calculating moment resistance