Having the rigid floor diaphragm specified allows you to model the lateral stiffness due to the diaphragm which you will not get if choose not to include it. Moreover the rigid floor diaphragm has the ability to automatically figure out the torsion due…

A composite deck is not equivalent to defining a rigid diaphragm. It assigns the composite properties to the beams based on the effective width of the slab. However it does not make the floor completely rigid. It also does not account for the torsion…

Here are the answers to the questions 1. A steel roof deck without concrete filling or a checkered plate floor are usually not considered as rigid diaphragm and so using master slave ZX will not be appropriate. If you would just want the loading on…

I agree with what Amir’s observation. Instead of defining rigid master slave connection, I would suggest you to use the rigid floor diaphragm command to model the diaphragms. This would require small changes to be made to the model but it would help you…