By default, wall out-of-plane stiffness is ignored in RAM Frame. Out-of-plane stiffness can be turned in in the General Criterial dialog in RAM Frame by selecting Criteria > General. Typically tilt-up walls are pinned at the base for out-of-plane behavior, so the release rotational fixity option should be selected as well. Convergence on theoretical results occurs as the mesh sizes decreases and may require the default maximum distance between nodes to be reduced. However, reducing the mesh size will increase the analysis time.

When gravity moments due to eccentricity and lateral pressures are applied to walls, diaphragms cannot be assigned as flexible or pseudo-flexible because these are no diaphragm conditions. Without a diaphragm, there is nothing for the wall to lean against in the finite element analysis. If there are gravity moments due to eccentricity, you will encounter an instability in the analysis or massive displacements. Similarly, pressures on the wall will produce excessive displacements unless the diaphragm displacements are locked (not applicable to flexible diaphragms) unless your intent is to look at a cantilevered walls with fixed bases.