https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/231683/mass-participationHello, Hello, when i run a time history analysis, the mass participation factors is more than 100% after mode 7. i used floor diaphragms. is this to cause the issue? STAAD.Pro CONNECT Edition V22 Update 8. thanksen-USTelligent Community 12https://communities.bentley.com/thread/718417?ContentTypeID=1Fri, 24 Jun 2022 09:37:06 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:221695ff-6ca1-4a78-8cdc-170255dcd687DSANJU<p>You had shared a model earlier with this post. Yes, I could see that RIGID DIAPHRAGM commands arecreating problem over there.</p><div style="clear:both;"></div>https://communities.bentley.com/thread/718413?ContentTypeID=1Fri, 24 Jun 2022 09:18:24 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:78f41816-bb04-4271-bb73-38bf38ef6adfDSANJU<p>Can you please attach the STAAD.Pro model?</p><div style="clear:both;"></div>