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Web Local Buckling

Module by: Michael Terk

Summary: (Blank Abstract)

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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 the width-thickness ratio is not large enough to withstand the moment on the beam. The way to prevent this type of buckling 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 λ p and λ r λ r . Then the maximum moment can be calculated.

Equations to determine WLB

Figure 1: The graph illustrates the options for WLB
Figure 1 (compactgraph.bmp)

When,

bt< λ p b t λ p (1)
there is no WLB and the cross section is compact because,
M n = M p M n M p (2)
M p = F y Z≤1.5 M y M p F y Z 1.5 M y (3)
from the yielding state.

When,

λ p <bt< λ r λ p b t λ r (4)
the graph is linear, and therefore a linear interpolation between M p M p and M y M y is used for the maximum moment.

And finally, when bt> λ r 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 of the Specification section of the Manual (page 16.1-96).

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