https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/131350/plate-girder-bridge---neutral-axis-to-calculate-moment-at-midspanPlease see the attached STAAD model as a reference. I am modeling a bridge with four 72&quot; deep plate girders + 10&quot; thick concrete deck on top. I have modeled everything using plate elements and I&#39;m in the process of calculating the midspan moments dueen-USTelligent Community 12https://communities.bentley.com/thread/401232?ContentTypeID=1Tue, 07 Feb 2017 22:42:09 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:91dd9292-60c6-4a74-8d42-db34f9ac2d30SyeAmir : All your points are correct.<div style="clear:both;"></div>https://communities.bentley.com/thread/401225?ContentTypeID=1Tue, 07 Feb 2017 21:29:10 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:fcd450e7-60ea-4581-9933-83669fc0d639Amir KalashehThank you for answering my previous questions, Sye! I have another question regarding the proper way to calculate shear in the plate girder at midspan.<br /> <br /> 1) Is it correct to calculate shear in the girder web by summing (Sxy * Plate Depth * Plate Thickness) for each web plate at midspan?<br /> <br /> 2) Is it correct to calculate shear in the girder flanges by summing (Qy * Plate Width * Plate Thickness) for each flange plate at midspan?<br /> <br /> 3) Is the total shear in the plate girder at midspan equal to the sum of all the shear in the girder web plates and girder flange plates?<div style="clear:both;"></div>https://communities.bentley.com/thread/400889?ContentTypeID=1Fri, 03 Feb 2017 17:10:23 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:0c5731b9-89ab-4350-9e34-3a6a4c1308a3Sye1. Calculating moments about the centroid of the plate girder would be appropriate<br /> 2. It would not make a difference in your model<div style="clear:both;"></div>