Does STAAD advanced concrete design (RCDC) consider the contributing effects of the slab flanges in RC beam design? I examined the calculation report for some beams and realized the beams are designed completely as rectangular beams even when you specify them as flange beams.
Reply;
RCDC can design beams with flanged action (T or L). As per design principles of flanged beam, RCDC uses this action only for mid-span bottom reinforcement.
Effective width of flange-action is calculated as per the provisions in code for simply-supported and continuous beams.
Below snip shows difference where same Beam is designed with Flanged action and without Flanged action, using Indian Code as an example.