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RE: Braced Frame Philosophy Question

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>Does anyone know what the rationale for
>the 1.5 multiplier applied to the brace
>force for an OCBF chevron (or V-type)
>brace is?  This is in ... 14.4a Item 1
>of the AISC Seismic Provisions for
>Structural Steel Buildings.

It is a simplified approach intended to limit post-buckling deformations of
the braces. A more rigorous approach could have been taken, but the 1.5
factor historically has been used. The unbalanced force in the beam can get
pretty large if the deformations (drift) is not controlled.


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