Discussion
Assertion (A): A thin shear web may be allowed to buckle well below its ultimate load.
Reason (R): After buckling it carries load as a field of inclined tension bands.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. Wagner's diagonal tension theory shows the post-buckled web carries far more than its buckling load, provided the flanges and uprights can react the inward pull. Designing for that state rather than against it saves considerable weight.
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