RAM Concrete enforces the same rigid diaphragm approach as used in RAM Frame (see RAM Frame Manual). All columns and beams within slab edges are attached to the diaphragm and those outside, or in openings, are disconnected from the diaphragm. It is important to realize that unless specified otherwise in the Criteria-Analysis dialog box for sloped framing at a story the diaphragm is always assumed to be rigid on a horizontal plane. For sloped framing constrained in the horizontal plane only this may result in unrealistic bending and torsion forces. Note that this behavior is a product of the finite element constraints and analysis and is not a program error. To remove the diaphragm constraint from a sloped diaphragm select the appropriate option in the Criteria-Analysis dialog box. There is currently no additional control over specifying which nodes are to be considered attached or released from the diaphragm.