Hello
The Diaphragm shear stiffness formula has changed based on the AISI 310-16 and this results in a much higher shear stiffness. Following the procedure suggested by RAM Calculating Semirigid Diaphragm E'... this results in a E' value that is 3-4x higher than it was previously. Is there a new method to determine E' based on the new formula by AISI 310-16 instead if the SDI method?
Thanks!
The premise of the approach noted on this wiki: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/18657/example-calculating-semirigid-diaphragm-e is that in real decked floors the amount of deflection from bending term (5wl^4/384EI) is negligible, so the deck guides give you other ways to calculate deflection based on shear and G'. Then we derive a value for E' such that our expected deflection equals the guide's theoretical deflection. You should be able to create a similar set of equations and solve for E' so long as AISI 310-16 gives a deflection equation based on G'.