12.9.1.4 Scaling Design Values of Combined Response
The combined response for the modal base shear (Vt) is compared with the calculated base shear (V) using the equivalent lateral force procedure automatically. If ıt’s less than 100% of the calculated base shear (V) using the equivalent lateral force procedure, the forces is multiplied by V∕Vt automatically.
Where the combined response for the modal base shear (Vt) is less than CsW, drifts is multiplied by CsW∕Vt automatically.
Symbols
V = The equivalent lateral force procedure base shear
Vt = The base shear from the required modal combination
A base shear (V) is calculated in each of the two orthogonal horizontal directions using the calculated fundamental period of the structure T in each direction and the procedures of Section 12.8.
12.9.1.4.1 Scaling of Forces
Where the calculated fundamental period exceeds CuTa in a given direction, CuTa is used in lieu of T in that direction. Where the combined response for the modal base shear (Vt) is less than 100% of the calculated base shear (V) using the equivalent lateral force procedure, the forces is multiplied by V∕Vt
12.9.1.4.2 Scaling of Drifts
Where the combined response for the modal base shear (Vt) is less than CsW, and where Cs is determined with Eq. (12.8-6), drifts are multiplied by CsW∕Vt.
