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3.3 Web local buckling

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Introduction to web local buckling

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 λ p and λ r . Then the maximum moment can be calculated.

Equations to determine wlb

The graph illustrates the options for WLB

When,

b t λ p
there is no WLB and the cross section is compact because,
M n M p
M p F y Z 1.5 M y
from the yielding state.

When,

λ p b t λ r
the graph is linear, and therefore a linear interpolation between M p and M y is used for the maximum moment.

And finally, when

b t λ r
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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Source:  OpenStax, Steel design (civi 306). OpenStax CNX. Jan 22, 2004 Download for free at http://cnx.org/content/col10153/1.3
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