| Notetip |
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The combined response for the modal base shear (Vt) iscompared 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 shall be is multiplied by V∕Vt automaticaly automatically. |
| Notetip |
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Where the combined response for the modal base shear (Vt) is less than CsW, drifts shall be is multiplied by CsW∕Vt automaticaly. automatically. |
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Symbols
V = The equivalent lateral force procedure base shear
Vt = The base shear from the required modal combination
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A base shear (V) shall be 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.
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Where the calculated fundamental period exceeds CuTa in a given direction, CuTa shall be 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 shall be multiplied by V∕Vt where
V = the equivalent lateral force procedure base shear, calculated in accordance with this section and Section
12.
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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 in accordance with Eq. (12.8-6), drifts shall be is multiplied by CsW∕Vt.
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Topics covered in this section:
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