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by huffte
29 Feb 2020, 18:25
Forum: 03-Unexpected behaviour/errors
Topic: Code Based Target Spectra
Replies: 1
Views: 273

Code Based Target Spectra

When I select ASCE 41-17 as the code for spectra generation, the requested input is SXS, SXL, Damping, Site Class, and transition period TL. I believe that SXL should actually be SX1? In ASCE 41-17, SXS and SX1 already have site effects incorporated. So, it appears that site effects are being applie...
by huffte
21 Feb 2020, 16:52
Forum: 04-Future developments & requests
Topic: Ground Motion Rotation
Replies: 1
Views: 420

Ground Motion Rotation

With all of the attention on maximum direction, geometric mean, RotD50, and other ground motion measures, it would be an asset for SeismoSignal to have such capabilities. For a given ground motion record pair, determine PSA and ground motion parameters for GeoMean, RotD50, RotD100, RotD00, etc. Just...
by huffte
19 Feb 2020, 15:21
Forum: 04-Unexpected behaviour/errors
Topic: Unexpected Interstory Drift Ratios
Replies: 7
Views: 5681

Re: Unexpected Interstory Drift Ratios

If you employ inelastic force-based elements (infrmFB)for the columns, and you do not subdivide said members (as it is typically unnecessary to do so with the infrmFB element), then you may simply go to the post-processor, 'Element Action Effects', and select the appropriate chord rotation. IDR is, ...
by huffte
18 Feb 2020, 16:00
Forum: 03-Analytical/modelling capabilities
Topic: Start/Middle/End of Elements
Replies: 4
Views: 260

Re: Start/Middle/End of Elements

Please see the Help system - Theoretical Background and Modeling - Material Inelasticity.

This should clear it up.
by huffte
13 Feb 2020, 17:09
Forum: 03-Analytical/modelling capabilities
Topic: Shear Demand from Performance Based Criteria
Replies: 1
Views: 200

Re: Shear Demand from Performance Based Criteria

1. Post-Processor
2. Element Action Effects
3. Frame Forces
4. Select the desired shear direction and element(s)
5. Refresh
6. Select 'Values' to get the actual values or 'Graph' to plot

I hope this helps Roshen.
by huffte
30 Jan 2020, 15:16
Forum: 03-Analytical/modelling capabilities
Topic: Masses of stores (floors)
Replies: 3
Views: 271

Re: Masses of stores (floors)

Once a static pushover analysis has been completed and you go to the post-processor, you should immediately see a number of results tabs, the second of which is "Eigenvalue Results". The "Eigenvalue Results" tab has two sub-tabs - "Modal Periods and Frequencies" and "Nodal Masses". Eigenvalues (squa...
by huffte
09 Jan 2020, 17:52
Forum: 04-Unexpected behaviour/errors
Topic: Very different results when modeling with different element classes.
Replies: 12
Views: 736

Re: Very different results when modeling with different element classes.

The infrmFBPH results are highly dependent upon the specified plastic hinge length. Note the following from the SeismoStruct Help System regarding infrmFBPH elements: 'The number of section fibres used in equilibrium computations carried out at the element's end sections needs to be defined. . . onl...
by huffte
06 Jan 2020, 15:58
Forum: 04-Unexpected behaviour/errors
Topic: problem with using FRP
Replies: 12
Views: 1874

Re: problem with using FRP

Given that you are using elastic frame elements (elfrm) I don't expect that the FRP wrap is doing much of anything. Refer to comments from Seismosoft above regarding the effect of the FRP wrap to enhance confinement and shear resistance. It isn't clear what you are modeling, but have you tried inela...
by huffte
06 Jan 2020, 15:21
Forum: 02-Analytical capabilities
Topic: Ground Motion Data Conversion
Replies: 5
Views: 576

Re: Ground Motion Data Conversion

The numbers in my second post are just made-up examples of what the file should look like. For actual values, from my previous post, I quote: 'create acceleration histories by first calculating Asin(wt), where A is the amplitude and w is the frequency in radians per second (obtained by multiplying t...
by huffte
01 Jan 2020, 17:13
Forum: 02-Analytical capabilities
Topic: Ground Motion Data Conversion
Replies: 5
Views: 576

Re: Ground Motion Data Conversion

The acceleration history needs to be time versus acceleration. So, for a 25 second duration at each given frequency, you could start at time 0.000, at each step of 0.005 seconds, do the required computations, and keep stepping by 0.005 seconds until you reach 25 seconds. Then move on to the next fre...

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