Direction dependant seismic checks are performed in the in plane direction only as this is the only direction in which shear walls are considered to act as Seismic Force Resisting Systems.

Walls included in the SFRS as Ordinary Reinforced Concrete Structural Walls (ORCSW) have no specific seismic design provisions according to ACI318-11.

For overall limitations and assumptions, see:

For seismic design, see: