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Stress Concentration Factors for Ductile Fuse Element

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I am designing a truss system for progressive collapse avoidance.  In order 
 to take advantage of inelastic behavior of the truss bottom chord (wide 
flange with strong axis horizontal) without creating excessive demand on 
chord and web member connections, I plan to provide a reduced section 
ductile fuse, similar to an ASTM E8 tensile test specimen, to ensure 
predictable ductile yielding at a regulated magnitude.  Unfortunately, my 
literature searches for similarly designed fuses in tension members have 
not turned up anything very helpful, but I am hoping some of the great 
minds of this list may have some suggestions/guidance on literature for 
mitigating/accounting for stress concentrations in such members.  I know 
that there are books for sale containing stress concentration factors for 
various geometries, and perhaps this is my best bet, but I suspect most of 
these references deal primarily with structures responding in the elastic 
range, and am not sure whether inelastic behavior would dictate a 
modification to these factors.  I am also not sure whether there are any 
such references designed with the structural engineer in mind, containing 
the sorts of shapes (angles, wide flange, etc.) that we like to design 
with.  Any leads would be much appreciated!

Best Regards,
Brian Felker, PE
Design Manager/Structural Engineer
Bldg Z-144, Rm 214
9324 Virginia Ave
Naval Station Norfolk
Norfolk, VA 23511-3095
(p) 757.341.2047
(f) 757.341.2095

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