ASCE 7 Section 12.8.4 addresses torsional forces, which are twisting loads created by lateral forces applied off-center from the building's geometric center. Wind or seismic loads applied at the building's facade create torsional forces rotating the building about its vertical axis. Accidental eccentricity accounts for the fact that the actual center of resistance may not align with the calculated center. ASCE 7 requires that lateral loads be applied with 5 percent accidental eccentricity in addition to the direct load, creating combined bending and torsional stresses. Buildings with significant torsional stiffness asymmetry (one side much stiffer than the other) experience higher stresses during earthquakes. Regular, symmetric building plans reduce torsional effects and are preferred in high seismic areas.