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

What is Loss of contact? How RCDC perform the design of footing if LOC is selected?

RCDC allow user to provide permissible limits for the loss of contact. If in any case due to tension in footing or heavy lateral moments, corners of the footings experience the -ve pressure. -ve pressure could be at corner or one of the sides of footing. i.e. two adjacent corners with -ve pressure. Technically, maximum 50% LOC is allowed. Thus, maximum limit in RCDC for LOC is 50%. User can provide the % LOC as per its design requirements. If there is LOC, top reinforcement would be design as per the bending moment at top face of footing due to loss of contact.

For more details, procedure and validation problems, please refer below link.

Footing design with LOC

https://communities.bentley.com/products/ram-staad/m/structural_analysis_and_design_gallery/274312