Response accelerograms cannot feature more than 200000 time

02-Analytical capabilities
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EmerssonB
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Joined: 09 Mar 2019, 15:51

Response accelerograms cannot feature more than 200000 time

Post by EmerssonB » 03 Jul 2019, 12:42

Hello, I've been trying to scale a 150 seconds accelerogram but this message appears "Response accelerograms cannot feature more than 200000 time-acceleration pairs of values"". Can you explain this please.

huffte
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Location: Cookeville, Tennessee, USA
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Re: Response accelerograms cannot feature more than 200000 t

Post by huffte » 03 Jul 2019, 14:00

What is the time step for your accelerogram (it must be quite small)? Even at 0.005 seconds, the number of pairs would be 150/0.005 = 30,000. If the number of records does indeed exceed the limit, you may still be able to process the accelerogram by specifying a frequency of 2 when you load the record. This would halve the number of points read and you would need to double the time step to keep the data accurate. If further reduction is needed, you could specify a frequency of 3 and triple the time step.
Tim Huff

EmerssonB
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Joined: 09 Mar 2019, 15:51

Re: Response accelerograms cannot feature more than 200000 t

Post by EmerssonB » 05 Jul 2019, 12:41

Hi, the time step is 0.005, it is 31632 values of acceleration, but it still shows the message "Response accelerograms can not feature more than 200000 time-acceleration pairs of values" when I try to do the matching. This is the file:
https://drive.google.com/open?id=1QYkvN ... lg7CLK1_el_
This is the accelerogram:
https://drive.google.com/open?id=1RhOIK ... guq4lqAMWg
And this is the spectrum:
https://drive.google.com/open?id=1vNmwe ... LFPqmYMwtu
Can you check it please.
Thanks a lot

huffte
Posts: 838
Joined: 22 Jul 2011, 10:19
Location: Cookeville, Tennessee, USA
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Re: Response accelerograms cannot feature more than 200000 t

Post by huffte » 05 Jul 2019, 14:32

I get the same error when I open your file, EmerrsonB. To test it out, I opened a file of my own which has 30,000 points and I still get the same error message as you regarding exceeding 200,000 points. I then tried opening my file only reading 1/2 of the points (a total of 15,000 points) and still get the message. So I am not sure what is going on there, but it appears to be a bug.

Here is the interesting part. If I define the target spectrum as an EC8 code spectrum, I never get the error. Even if I load your accelerogram with 31,000 + points, the error never occurs and the matching process converges.

So a note to the SeismoSoft team, it appears that defining a target spectrum form a file is not working properly and is producing confusing error messages. The size of the input accelerogram does not appear to be the problem.
Tim Huff

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z.gronti
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Re: Response accelerograms cannot feature more than 200000 t

Post by z.gronti » 08 Jul 2019, 11:53

Dear EmerssonB,

The reason why you receive such an error message is because the matched accelerogram that SeismoMatch tries to create exceeds the limit of 200000 time-acceleration pairs of values. Hence, I would suggest to load the original accelerogram with less time-acceleration pairs of values (this affects the number of time-acceleration pairs of values of the matched accelerogram) or increase the value of the Min. Period, i.e. the Lower period bound within which spectral matching is carried out.
Zoi Gronti
Seismosoft Srl.

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