Limitations on Base Shear Stress

NCh433 indicates the total shear that the building structure must accommodate at it base. In no case shall this base shear be less than AoIP/6g, where I is the “importance" factor of the building; and P is the total weight of the building above the base level. Furthermore, the code states that if the calculated base shear stress is less than the above minimum, then interstory displacements must be multiplied by a factor so that the shear stress meets the stated value.