ONE rigid diaphragm OR DIFFERENT rigid diaphragms?

[etriye]

Hello friends, I have a project in the middle of the elevator shaft, stairs and glass cladding The architect's obsession does not want to see beams on the stairs, in this case, I think to operate different rigid diaphragms It's like 2 separate building masses, but when I look at earthquake loads, earthquake loads in different rigid diaphragms, for example rd1 rd2 62 63 tons in the x direction at their level; In the acceptance of a single rigid diaphragm, the difference is big since it takes approximately 131 tons of torsion values separately. Now my question to you is, I am thinking of making 2 separate systems as there is a lot of building space here, and I am waiting for your suggestions and suggestions.

 

[proisa]

This kind of project came across to me as well. With the assumption of a fully rigid diaphragm, you can get erroneous results in a single rigid diaphragm. Therefore, it would be appropriate to define 2 different diaphragms. However, if you use a semi-rigid diaphragm solution (because the floors are included in the system and load transfer is more realistic), I guess that when you solve it with a single rigid diaphragm, you will get results very close to the solution with 2 different fully rigid diaphragms. (It was like that in my project) While more moment and shear forces will act on your S22 - S23 columns and P03 - P06 walls in a fully rigid and single diaphragm, the loads on the elements in the core will be less than they should be.