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EBF example problem (easy for morning lateral)

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I decided to make up a morning lateral problem for an ECBF:

A W18x50 link beam has been deemed adequate for an eccentrically braced frame. What link length is required to keep the beam link controlled by shear yielding.

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I'll give this a go...

The answer should most nearly be 4'-0". Finding e=1.6Mp/Vp. Let me know if this is way off base. I haven't looked much at the EBF systems yet.

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Rhoadies,

Sorry for the late reply. The answer is 45" as can be seen in table 3-1 of the seismic provisions.

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