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Section 2
2-33
Table 2.3 - AASHTO Design Parameters
Parameter Default Description
Name Value
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.
NSF 1.0 Net section factor for tension members.
UNL Member Length Unsupported length of compression flange for calculating
allowable bending compressive stress.
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
RATIO 1.0 Permissible ratio of the actual to allowable stresses.
Verification Problem
One verification problem is shown in the next few pages for
reference purposes.