So part of my structure have level without floor and there is no diaphragm assigned since I assigning diaphragm from shell. But without the diaphragm, wind load is not applied. I understand that using the same diaphragm means the joints will have an effect on one another. However, these vertical element shouldn't have an effect since there is no diaphragm effect without slab. I read somewhere that it is okay to assign the same diaphragm since the column is continuous, is this correct?
Does it matter if I use the same diaphragm or different diaphragm for each section of the structure? I am trying to assign diaphragm for the structure with the layout as follows. I can easily identify four groups that are connected by corridors, not sure if I should further separate the lower block into more groups. I tried both and it seems that the forces will just redistribute differently and it is not clear which is the better model. Also my storey shear changes for lateral load which I assume is due to the diaphragm extent having a different shape. Any comments?
Does it matter if I use the same diaphragm or different diaphragm for each section of the structure? I am trying to assign diaphragm for the structure with the layout as follows. I can easily identify four groups that are connected by corridors, not sure if I should further separate the lower block into more groups. I tried both and it seems that the forces will just redistribute differently and it is not clear which is the better model. Also my storey shear changes for lateral load which I assume is due to the diaphragm extent having a different shape. Any comments?