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To calculate by hand I would use the formulas in the National Design Specification for Wood Construction. The calculation is a little long but all the factors are straight forward.

Thanks Mike. I have seen that section, however I have reservations to use that value since this Gypsum deck sits on bulb tees and I would have a difficult time comparing the typical 12" o.c. fastening of gypsum walls to studs with the bulb tees every 3'-0" o.c. or so. I do appreciate your...

Does anyone have any resources or experience using a bulb T and gypsum roof deck as a roof diaphragm. This is an existing building with bar joists and steel roof girders. However there is no horizontal "x" bracing at the roof level. I need to do a lateral analysis of the building due to...

I agree with rcd445. I have never designed the stringers for a combination of live load plus downward handrail load. Just imagine a person pushing down on a handrail. Would it not produce an uplift at their feet?

Unless you can prove that the beam/ handrail works as a Vierendeel truss, I would not consider it. I have never tried to make this work since the increased cost of the oversized handrail and proper detailing of the handrail/beam connection would offset the cost of just using a larger size beam.

Seems like a bad approach that if you can't get a calculations to work then it should be specified for someone else to design. Just a thought, could a heavy gauge steel studs be used with steel angles provided between the studs which you could anchor to. A thru bolt would need to be used...

The geometry of a curved stair induces additional downward load on the outside stringer and some upward load on the inside stringer. The connections between the stringers and the treads/risers become critical. There are design examples for curved steel beams (highway bridge) in the Structural...

I have never designed a column for eccentricity if the connection is a "Simple Shear Connection" such as a single plate. In the 13th Edition of the AISC manual there is a statement on page 10-103 (bottom paragraph)"The design procedure for extended single-plate shear connections permits the...