# 12.9.1.4 Scaling Design Values of Combined Response

The combined response for the modal base shear (V_{t}) is* *compared with the calculated base shear (V) using the equivalent lateral force procedure automatically. If ıt’s

*using the equivalent lateral force procedure, the forces is*

**less than 100% of the calculated base shear (V)***automatically.*

**multiplied by V∕V**_{t}Where the combined response for the * modal base shear (V_{t}) is less than C_{s}W*, drifts is

*automatically.*

**multiplied by C**_{s}W∕V_{t}**Symbols**

V = The equivalent lateral force procedure base shear

V_{t} = 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 C_{u}T_{a} in a given direction, C_{u}T_{a} is used in lieu of T in that direction. Where the combined response for the modal base shear (V_{t}) is* less than 100% of the calculated base shear (V)* using the equivalent lateral force procedure, the forces is

**multiplied by V∕V**_{t}

12.9.1.4.2 Scaling of Drifts

Where the combined response for the * modal base shear (V_{t}) is less than C_{s}W*, and where C

_{s}is determined with Eq. (12.8-6), drifts are

*.*

**multiplied by C**_{s}W∕V_{t}