Difference in Compressive & Tensile stress values for a symmetrical I beam which is connected to a vertically restrained plated structure and subjected to UDL

Difference in Compressive & Tensile stress values for a symmetrical I beam which is connected to a vertically restrained plated structure and subjected to UDLhttps://communities.bentley.com/products/ram-staad/f/ram-staad-forum/231936/difference-in-compressive-tensile-stress-values-for-a-symmetrical-i-beam-which-is-connected-to-a-vertically-restrained-plated-structure-and-subjected-to-udlHi, I was doing a case study for the combined beam & plate effect in STAAD Pro using AISC ASD. 2 geometries were prepared; 1. A simply supported beam subjected to 1kN/m UDL 2.A simply supported beam with plate structure bottom vertically restraineden-USTelligent Community 12