Maximum Direction Ground Motion

02-Analytical capabilities
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Kirkaguel
Posts: 37
Joined: 31 Dec 2018, 10:04

Maximum Direction Ground Motion

Post by Kirkaguel »

One of the requirements of ASCE 7-16 ground motion for response history analysis is that it should use the maximum directon ordinates of which in the case of PEER online scaling program is RotD100 which I believe Seismoselect also has this option, my question is when linking to PEER ground motion database and selecting the component definition, is the output ground motion already rotated to the maximum direction?

This is the limitation of PEER online scaling the selected ground motions are not scaled and not rotated to maximum direction. Is this capability automatic in Seismoselect?
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seismosoft
Posts: 860
Joined: 06 Jul 2007, 04:55

Re: Maximum Direction Ground Motion

Post by seismosoft »

As you correctly pointed out, the PEER database features only the RotD50 intensity measures and spectra. We are currently trying to find a way to automatically scale the RotD50 parameters to RotD100, so that to be compatible to ASCE 7-16 (and other codes), however this is by no means straightforward.
Note that the ESM database has the RotD100 parameters stored and also features more than 20,000 record. You might be interested in checking it.
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Kirkaguel
Posts: 37
Joined: 31 Dec 2018, 10:04

Re: Maximum Direction Ground Motion

Post by Kirkaguel »

Thanks Seismosoft support for the clarifications. Will try the ESM database for sure.

Hoping as well that automatic RotD100 scaling can be implemented soon.
rbsce.ph
Posts: 30
Joined: 29 Jul 2020, 09:29

Re: Maximum Direction Ground Motion

Post by rbsce.ph »

Hi Seismosoft,

Do you know how I can apply in Seismostruct the concept of using the Conditional Mean Spectrum for the time history ground motion.
Your response will be highly appreciated.

Thank you.
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seismosoft
Posts: 860
Joined: 06 Jul 2007, 04:55

Re: Maximum Direction Ground Motion

Post by seismosoft »

SeismoStruct uses the standard Uniform Hazard Spectrum (UHS) format, unfortunately as proposed by most Standards; Conditional Spectra cannot be introduced directly.
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huffte
Posts: 889
Joined: 22 Jul 2011, 10:19
Location: Cookeville, Tennessee, USA
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Re: Maximum Direction Ground Motion

Post by huffte »

You should be able to manually generate your CMS, save to a text file, and define the target from the file, rather than auto-generating a response spectrum.
Tim Huff
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