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American Steel Design
Section 2
2-62
2.14.10 Design Parameters
Design per LRFD specifications is requested by using the CODE
parameter (see Section 5.47). Other applicable parameters are
summarized in Table 2.2. 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.
See Table
2.2 and
Section
5.47.1
The parameters DMAX and DMIN are applicable for member
selection only.
Table 2.4 - AISC LRFD Parameters
Parameter Default Description
Name Value
KX 1.0 K value for flexural-torsional buckling.
KY 1.0 K value in local Y-axis. Usually this is the minor
axis.
KZ 1.0 K value in local Z-axis. Usually this is the major
axis.
LX Member Length Length for flexural-torsional buckling.
LY Member Length Length to calculate slenderness ratio for
buckling about local Y-axis.
LZ Member Length Length to calculate slenderness ratio for
buckling about local Z-axis.
FYLD 36.0 ksi Yield strength of steel.
FU 60.0 ksi Ultimate tensile strength of steel.
NSF 1.0 Net section factor for tension members.