Incremental Dynamic Analysis

04-Unexpected behaviour/errors
ydnar_rye
Posts: 3
Joined: 09 Sep 2022, 16:09

Re: Incremental Dynamic Analysis

Post by ydnar_rye »

Thank you for the response Admin.

What I mean is from the results of post-processing->IDA Envelop->Max Drift vs. Corres. Base Shear, how can I make my IDA curves (Sa of T1 5% vs. Max. ISD Ratio)?

Thank you again for your further reply.

By the way, I know that the video I posted was not created by Seismosoft since I cannot find any sample video provided by Seismosoft regarding IDA procedure.
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seismosoft
Posts: 1093
Joined: 06 Jul 2007, 04:55

Re: Incremental Dynamic Analysis

Post by seismosoft »

I am not sure what you mean with 'Sa of T1 5%'. The IDA curves are the ones provided by the program. Again we are not sure what you mean, but if you mean the transformation in the ADRS (acceleration-displacement response spectra) space, this is not done automatically by the program.
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ydnar_rye
Posts: 3
Joined: 09 Sep 2022, 16:09

Re: Incremental Dynamic Analysis

Post by ydnar_rye »

What I mean for Sa of T1 5% is the first-mode spectral acceleration with 5% damping coefficient. This is the vertical axis (as the Intensity Measure where other researchers use PGA instead of Sa,T1 of 5%) plotted against the horizontal axis of maximum interstory drift (Demand Measure, DM) for a typical IDA curves, as indicated in the paper of Vamvatsikos. Maybe, I need to review again the plots of IDA Envelope from Seismostruct. Thank you again for answering.
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seismosoft
Posts: 1093
Joined: 06 Jul 2007, 04:55

Re: Incremental Dynamic Analysis

Post by seismosoft »

Indeed, this is what I suspected.
As we explained in our previous post the transformation in the ADRS (acceleration-displacement response spectra) space is not done automatically by the program.
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