https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/223747/ram-ss-seismic-stability-coefficient-calculationHi - I was hoping that someone would have some further information on how RAM Frame calculates the seismic stability coefficient (theta). When I do a quick hand check of the numbers given in the report, I find that the reported thetas are significantlyen-USTelligent Community 12https://communities.bentley.com/thread/688457?ContentTypeID=1Tue, 21 Dec 2021 15:48:18 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:ba3258f9-bcbc-400c-bea7-a6d2550aef3eSeth Guthrie<p>The importance factor cancels out with delta_xe.</p> <table height="185" width="837"> <tbody> <tr> <td width="78">P</td> <td width="78"></td> <td width="78"></td> <td width="78">9784</td> <td width="50">k</td> <td width="381">the total vertical design load at and above Level x</td> </tr> <tr> <td>delta xe</td> <td>0.81</td> <td>delta ye</td> <td>-0.29</td> <td>in</td> <td>the elastic drift from the story displacements</td> </tr> <tr> <td>Vx</td> <td>574.12</td> <td>Vy</td> <td>-6.43</td> <td>k</td> <td>the seismic shear force acting between Levels x and x &minus;1</td> </tr> <tr> <td>hsx</td> <td></td> <td></td> <td>216</td> <td>in</td> <td>the story height below Level x (in)</td> </tr> <tr> <td>Ie</td> <td></td> <td></td> <td>1</td> <td></td> <td>importance factor - always 1 (cancels with delta xe)</td> </tr> <tr> <td>Cd</td> <td></td> <td></td> <td>5.5</td> <td></td> <td>cancels in theta equation, used in Theta max</td> </tr> <tr> <td>Beta</td> <td></td> <td></td> <td>1</td> <td></td> <td></td> </tr> <tr> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> </tr> <tr> <td>Theta x</td> <td>0.064</td> <td>Theta y</td> <td>2.043</td> <td></td> <td></td> </tr> <tr> <td>Theta x max</td> <td>0.091</td> <td>Theta y max</td> <td>0.091</td> <td></td> <td></td> </tr> </tbody> </table><div style="clear:both;"></div>