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Your approach is a bit to conservative, the load will be distributed out over a larger area based on floor deck section and reinforcing in the concrete section. You should refer to the "Composite Deck Design Handbook" by SDI. It has examples of how to calculate deck capacity for concentrated...

It is possible to get the center of rigidity outside of the building envelope. To simplify the situation, ignore the walls that have 1% rigidities and simply turn the building 45 degrees, notice how the building starts to look like a L shape. The COR for an L shape would be at the origin of the...

Sorry, not familiar with 780CMR.

Sorry for tardiness, but came across this today in the California "Rules of the Board for Professional Engineers and Land Surveyors California Code of Regulations Title 16, Division 5 §§ 400-476" "(3) When signing and sealing documents containing work done by or under the responsible charge of...

My take on this is that hn is taken to the center of mass of the highest diaphragm. In your case, a pitched roof, would be about mid height between eave and ridge.

Refer to AISI "Standard for Cold formed Steel Framing - Wall Stud Design" Section C3.2. Basically, there is an option to design with sheathing braced conditions, including Gypsum. For axial design, minor axis can be assumed to be braced at 2 X screw spacing. To prevent screw connection failure...

As I understand it, this figure is used in determining the term "Avc". "Avc" is only used in determining concrete strength. The strength of the steel anchors will be determine seperately and unrelated to "Avc". So, if you have a group of anchors, say 2 x 2 pattern connected by a plate, you...

Have you checked the AISI Standard "Standard for Cold-Formed Steel Framing - Lateral Design", 2004 Ed.? There are diaphragm values, and shear wall values in this standard along with the references that were used in developing them. Hope this helps.

As far as HSS as SMF, I do not believe there is sufficient testing, therefore there are no prequalified connections for them, refer to AISC Seismic Provisions for Structural Steel Buildings, section 9.2b. Chapter K of the standard provisions would not be sufficient to meet the seismic detailing...