
Base Shear
Base shear is an estimate of the maximum expected lateral force that will occur due to seismic ground motion at
the base of a structure. Calculations of base shear (V) depend on:

soil conditions at the site

proximity to potential sources of seismic activity (such as geological faults)

probability of significant seismic ground motion
 the level of ductility and overstrength associated with various structural configurations and the total weight of the structure
 the fundamental (natural) period of vibration of the structure when subjected to dynamic loading

