The third limit state for beams is Web Local Buckling, or
WLB for short. This type of buckling occurs when thewidth-thickness ratio is not large enough to withstand the
moment on the beam. The way to prevent this type ofbuckling is to limit the with-thickness ratio.
The limits can be computed for web local buckling. The
width-thickness ratio is compared to
and
. Then the maximum moment can be calculated.
Equations to determine wlb
When,
there is no WLB and the cross section is compact because,
from the yielding state.
When,
the graph is linear, and therefore a linear interpolation between
and
is used for the maximum moment.
And finally, when
the graph is non-linear, the web is non-slender, and there
is an equation to find the maximum moment in Appendix F ofthe Specification section of the
Manual (page 16.1-96).
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