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by huffte
18 Nov 2022, 15:09
Forum: 02-Analytical capabilities
Topic: Maximum Direction Ground Motion
Replies: 14
Views: 3900

Re: Maximum Direction Ground Motion

Yes. ASCE 7-22 data are RotD100. You compute RotD100 for the ground motion record pair and scale to the design response spectrum. I quote from ASCE 7-22, Section 16.2.3.2: "For each horizontal ground motion pair, a maximum-direction spectrum shall be constructed from the two horizontal ground motion...
by huffte
17 Nov 2022, 22:59
Forum: 02-Analytical capabilities
Topic: Maximum Direction Ground Motion
Replies: 14
Views: 3900

Re: Maximum Direction Ground Motion

Be careful if you get the data from USGS. While virtually all data in codes (AASHTO and ASCE 7) are based on USGS data, there are different bases available. If you use ASCE 7-22 based USGS data from here, you will get RotD100, Risk-targeted ground motion data, and you should scale records RotD100 to...
by huffte
12 Nov 2022, 15:34
Forum: 02-Analytical capabilities
Topic: Maximum Direction Ground Motion
Replies: 14
Views: 3900

Re: Maximum Direction Ground Motion

You have correctly identified one of the outstanding issues with maximum direction (RotD100-based) scaling of ground motions. With GeoMean-based scaling, you amplify both components be the computed scale factor. With RotD100-based scaling, you still amplify both components by the computed scale fact...
by huffte
20 Oct 2022, 02:31
Forum: 03-Analytical/modelling capabilities
Topic: stiffness
Replies: 2
Views: 73

Re: stiffness

I am not familiar with the particular section of EC8 to which you refer. But I assume it is applicable to an elastic analysis, perhaps elastic response spectrum analysis. If this is the case, I believe you will have to do this manually. SeismoStruct is general purpose and not, I believe, coded to an...
by huffte
06 Oct 2022, 14:37
Forum: 02-Analytical capabilities
Topic: rotational components
Replies: 1
Views: 91

Re: rotational components

While this question is completely outside the realm of the intent of this forum (questions regarding SeismoSoft and its software), I'll suggest you start with the following: https://www.buffalo.edu/mceer/catalog.host.html/content/shared/www/mceer/publications/MCEER-12-0005.detail.html I hope it helps.
by huffte
16 Sep 2022, 16:23
Forum: 02-Getting started with the modelling
Topic: User-defined constitutive model?
Replies: 2
Views: 71

Re: User-defined constitutive model?

I wonder if the general hysteretic model might work? Just a thought worth looking into.
by huffte
20 Aug 2022, 15:32
Forum: 02-Getting started with the modelling
Topic: Results
Replies: 10
Views: 329

Re: Results

I am afraid I do not understand what you mean by "overall results". And it is not clear what you mean by "regulation checks". If you mean exceedance of strain limits, chord rotations, etc . . defined in the Performance Criteria tab of the pre-processor, then you can specify that notification be give...
by huffte
19 Aug 2022, 14:11
Forum: 02-Getting started with the modelling
Topic: Results
Replies: 10
Views: 329

Re: Results

In the Post-Processor, all plots have the option of explicitly showing the maxima and minima for the parameter being plotted. Simply check the "Max" and "Min." boxes and the numerical values will be added to the plot. Or, if you want to do your own custom plotting and analysis of the entire history,...
by huffte
18 Aug 2022, 14:34
Forum: 02-Getting started with the modelling
Topic: Results
Replies: 10
Views: 329

Re: Results

The results of a dynamic response history analysis are, indeed, the results at each time step. Certainly, if you are interested in the maxima and minima, you may obtain those from SeismoStruct results. It is up to the engineer to decide what is important based on the intent of the analysis. Also, it...
by huffte
07 Jul 2022, 14:28
Forum: 04-Future developments & requests
Topic: Need for more decimal places while defining PGA for target response spectrum and domains of matching
Replies: 3
Views: 282

Re: Need for more decimal places while defining PGA for target response spectrum and domains of matching

Just a note of clarification, rhtcr7. SeismoMatch does indeed incorporate spectral matching in the time domain. Wavelets are added directly to the input accelerogram. There is no manipulation of the Fourier spectrum in SeismoMatch. SeismoArtif, on the other hand, incorporates spectral matching in th...

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