https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/119246/how-to-model-property-for-structural-roof-deck-diaphragmI am trying to accurately model a gable roof with a structural metal roof deck that acts as a diaphragm. Ultimately, I&#39;d like to take forces from my STAAD model to design the structural metal roof deck diaphragm. I only want to consider metal roof decken-USTelligent Community 12https://communities.bentley.com/thread/367761?ContentTypeID=1Fri, 13 May 2016 19:25:16 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:88bb8488-0d0b-450a-ba19-b19b849119bcSeth Guthrie<p>Here is some general advice about semi-rigid diaphragms that might help you. <a href="https://communities.bentley.com/Products/Structural/Structural_Analysis___Design/w/Structural_Analysis_and_Design__Wiki/ram-ss-semirigid-diaphragms">communities.bentley.com/.../ram-ss-semirigid-diaphragms</a>While that wiki was written for Ram Frame most of the comments apply to other finite element analysis programs like STAAD.pro</p><div style="clear:both;"></div>