Most building codes require the inclusion of accidental torsion in both the equivalent static load procedure and dynamic analysis. The code requirements for evaluating accidental torsion in the equivalent static load procedures and dynamic response spectra procedures are implemented in RAM Frame.

If the options to consider the plus- and minus eccentricity for each direction are selected, four load cases will be created. For the dynamic load cases the centers of mass of each floor level are translated by the amount of eccentricity specified. The stiffness matrices and mass matrices are calculated independently for each load case, with respect to the translated centers of mass, and the dynamic analysis performed.

It should be noted that accidental torsion effects can be included in analysis for Rigid and Semirigid diaphragms (see Pseudo-Flexible Floor Diaphragms ). For pseudo-flexible diaphragm, it is assumed that a flexible diaphragm is not able transmit diaphragm torsional moments, and hence accidental torsion effect is ignored for flexible diaphragms.