How To Calculate Stability Index θ In ETABS (ACI-19)
In this amazing educational example, We will calculate stability Index according to ACI 2019 6-6-4-4. for doing this we need vertical factored forces and story shears and Center of mass drifts in ETABS. then we must copy and paste data to excel and calculate aci formula and check which stories can pass this control. as result when you turn on P-Delta effect, the number of stories that can't pass ( smaller than 0.05) is increasing. The calculations must be done for both X-Dir and Y-Dir . If your structure can't pass this control you should change your design and make new beam and column sections or using structure with bigger Ru or using shear wall or decreasing story heights or reducing Span lengths.
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Timecodes
0:00 - ETABS
0:10 - ACI 2019 Stability Index Formula (6.6.4.4)
1:07 - Start ETABS model with P-Delta option on
1:24 - exporting Vertical force and story shears to excel file
3:38 - Exporting center of mass displacements (cm) to excel and convert them to drifts
6:01 - Calculating stability Index for both X-Dir and Y-Dir
9:20 - Comparing results for both direction (stability index 0.05)
10:12 - starting new model with ignoring P-Delta option
14:52 - Results for stability Index when we ignored p-delta
15:28 - General ways to modify stability index for structure
