Relevant STAAD.Pro model (.std file) can be downloaded from the following link:
STAAD.Pro model for Bending Capacity Check
Overall Dimension (D) = 820mm
Flange width (Bf) = 200mm
Flange thickness (tf) = 10mm
Thickness of Web (tw) = 6mm
h = 820-2*10 = 800mm
Section Class :
Flange class : Semi-compact
Web class : Slender
Overall Class : Slender
The member is laterally supported (LAT 1) and welded section (STP 2). FYLD is specified as 345 N/mm2.