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[Results] What is the modified drift option in Story Drift Table? How is it calculated?

Question

What is the modified drift option in Story Drift Table? How is it calculated?

 

Answer

Modified Story Drift depends upon various factors like whether to consider P-Delta effect and other code provisions.

To set the parameters for modified story drift, from the main menu select Result > Table > Result Tables > Story > Story Drift

The computation of Modified Drift is as follows:

When “Response Modification Coefficient”
(1) Option is Selected:

Modified Drift
= ad * Story Drift * Response Modification Coefficient (RMC) *Scale Factor

where
ad = P-delta increment factor ( defined under P-Delta analysis control)
Cd = Deflection Amplification Factor
Ie = Importance factor

(2) Not Selected:
Modified Drift
= ad * Story Drift * Cd * Scale Factor / Ie

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