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Section 2
2-13
Table 2.1 - AISC Parameters
Parameter Default Description
Name Value
KX 1.0 K value used in computing KL/r for flexural torsional
buckling for tees and double angles
LX Member Length L value used in computing KL/r for flexural torsional
buckling for tees and double angles
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 local z-axis.
FYLD 36 KSI Yield strength of steel in current units.
FU Depends on FYLD Ultimate tensile strength of steel in current units. If FYLD
< 40 KSI, FU = 58 KSI
If 40 KSI ≤ FYLD ≤ 50 KSI, FU = 60 KSI
If FYLD > 50 KSI, FU = 65 KSI
NSF 1.0 Net section factor for tension members.
UNT Member Length Unsupported length of the top* flange for calculating
allowable bending compressive stress. Will be used only
if flexural compression is on the top flange.
UNB Member Length Unsupported length of the bottom* flange for calculating
allowable bending compressive stress. Will be used only
if flexural compression is on the bottom flange.
CB 1.0 Cb value as used in section 1.5 of AISC. 0.0 = Cb value
to be calculated. Any other value will mean the value to
be used in design.
SSY 0.0 0.0 = Sidesway in local y-axis.
1.0 = No sidesway
SSZ 0.0 Same as above except in local z-axis.
CMY
CMZ
0.85 for sidesway
and calculated
for no sidesway
Cm value in local y & z axes
MAIN 0.0 0.0 = check for slenderness
1.0 = suppress slenderness check
*Top and Bottom represent the positive and negative side of the local Y axis (local
Z axis if SET Z UP is used.