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Re: Tension Only Braces Seismic Zone 3

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If the tension only braces are threaded rods with the threads cut into the rod [not upset], keep in mind that the threads cannot be very ductile because yielding can occur only at the bases of the threads.  I would design them with large enough cross-sectional area that they cannot yield under  the maximum expected seismic forces.
Nels Roselund
Structural Engineer
South San Gabriel, CA