My assumption is that rolled sections have a homogenous connection between flange and web so Aw is calculated based on the full depth. A plate web girder is where an I beam is made up of separate flange web components and welded together. Conservatively, the web and flange junction is not...
There appears to be no clear specification on what depth to use for calculation of Aw in 5.11.4
Limsteel program (University of Sydney) uses full depth for hot rolled UB and welded WB beams (WB beams being the welded beams from One Steel) and depth between flanges for plate web girders
ASI...
