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The existing building is load-bearing CMU with steel joists, built decades ago. The addition is adjacent to existing, but independent (horizontal addition, not vertical). The existing building, its required upgrade, etc. is NOT the question. The question is related to the NEW construction...

Thanks Mike. Sorry about the confusion, but my question is related to the SLRS of the new, independent addition. Not the existing structure. The existing structure won't be touched, that is fairly clear. But the addition - I just can't see how it can be an R=3 system.

Our firm has been awarded a new hospital addition in a high seismic area. Governing code is IBC 2009. Site Class is D, spectral accelerations are high, so the SDC is D and by a mile. The structural narrative of the RFP lays this out and I have verified. However, the structural narrative of...

Thanks spats. Does ASCE Wind Design Guide or any other official publication comment on this...that you know of?

I'm wondering about Zone 2 (edge) vs. Zone 3 (corner) for re-entrant corners and angled corners. See attachment in link.

This question is not about whether or not steel deck parallel to a steel beam braces the top flange. However, in a typical steel-framed building, the concrete slab & metal deck span over the beams and run parallel to the girders. My question is construction-related: before the concrete is...