Excessive P-Delta Deformation at Story: label .

Solution:

This error may be caused by a poorly configured structure such as one with a level or levels with large masses and small stiffness or some dummy levels with no mass and with staggered configurations. The calculated P-Delta effects may not be realistic and hence produces this error. It may be necessary to modify the framing configuration of the model.

This error may also occur if a significant number of columns and braces are disconnected from the diaphragm at a certain story level, resulting in excessively reduced diaphragm stiffness. Disconnecting fewer columns in RAM Frame or combining the mass of that level with another in Loads - Masses can resolve this problem.