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

A: 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

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
Creation date: 8/17/2017 3:35 PM      Updated: 9/5/2017 8:31 AM
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