Applies To
	Product(s):	STAAD Advanced Concrete Design
	Version(s):	Connect Edition
	Environment:
	Area:	Concrete Design
	Subarea:	Beam Design
	Original Author:	Aaradhya Rahate, Bentley Technical Support Group

In STAAD generally we design the beam as centre to centre of column and from output we interpolate the beam reinforcement at the face of the column. How we can do the same in the RCDC. Because in boiler supporting structure where column size is 900x900 mm difference in beam reinforcement at centre of column & at face of the column is around 1000 mm².  Like in attached STAAD file for beam member no. 105, reinf. At centre of column is 3297 mm². Whereas by interpolation at face of the column its around 2722 mm².

 

Solution:

RCDC design the Beam based on geometry and forces available from the analysis file. It doesn’t modify the forces. In you case, the beams are modelled up to centre of the column and beam need to design at face of the column.

We would suggest following methods to add the beam at face of the column, so that beam will get design at moment available at face of the column,

1. User can assign Member offset command available in STAAD. RCDC will read the beam length and force available in STAAD as per the offset beam length.
2. User can define the rigid member within the column extent. The property of this member can such that the stiffness is more than the beam stiffness. i.e. YD = 3m and ZD = 0.45 m

The density of this member can be assigned as Zero. RCDC auto ignores the member within the column and with zero density.

The beam can be designed as per moment available at face of the column. Refer below snap

 

Below is the snap from the RCDC,