https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/244410/understanding-drift-resultsHello, I am trying to understand drift results for my structure using RAM SS. We have semi-rigid diaphragms modeled and are trying to use the drift at control points to check the drift ratios. We have chosen select frame nodes coordinates as our controlen-USTelligent Community 12https://communities.bentley.com/thread/762664?ContentTypeID=1Wed, 19 Apr 2023 22:58:27 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:e7317659-5803-4967-b9d1-f7ae41f73ae5Seth Guthrie<p>If you want the displacement at the nodes it&#39;s more precise to use nodal displacements.&nbsp;</p> <p>Assuming the diaphragms are rigid, the drift report is mostly useful for the final checks that compare the control point displacements vs average displacements to see if there is a torsional irregularity. It will only give values for a level if there is, in fact, a diaphragm at the control point location. Where levels are partial and do not cover the control point 0 values are expected. This also causes some confusion in the story drift ratio because the program is then going to look at the non-zero deflection&nbsp;vs the two-story height.&nbsp;</p> <p>If the diaphragm is semi-rigid you can still get results, but these can deviate from the frame displacements when the diaphragm is soft. A review of the deflected shape is useful for confirming that condition.&nbsp;</p><div style="clear:both;"></div>