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

Questions: 

Side face reinforcement is provided in the beam even though the beam has no torsional moment, and the beam web depth is less than 750mm. Please clarify. 

Solution: 

The beams are designed using the option of Bi-axial Bending in RCDC. The Beam section would be designed for axial force, biaxial moment, and biaxial shear. So, whenever the design for ‘Biaxial Bending’ is selected, RCDC would treat the design of the beam like a column.  

 

Axial forces govern whether to detail the member like a beam or column.IS 13920-2016 suggests detailing the member as a column as per clause 7 if axial stress exceeds 0.08kck. here the section will be detailed as a column. Shear (ductile) links should be calculated as per column. If axial stress is less than 0.08 fck the section would be detailed as a beam. 

 

If the section is detailed as a column, RCDC will provide the minimum side face reinforcement even if there is no torsional moment and the web depth is less than 750mm. As per the ductility requirements, each rebar must be tied along both directions if the section is designed and detailed as a column. Thus, RCDC provides the side face reinforcement to tie the horizontal links.