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by huffte
26 May 2020, 13:55
Forum: 02-Analytical capabilities
Topic: Scaling factor significant figures
Replies: 4
Views: 369

Re: Scaling factor significant figures

One idea: load the accelerogram with a specified scale factor of 1.0. Set to 9 decimal places in the settings for subsequent loading of a revised accelerogram. Copy and paste the ensuing table of acceleration versus time into Excel and scale the record in Excel before saving as a new text file which...
by huffte
18 May 2020, 22:32
Forum: 02-Analytical capabilities
Topic: Scaling Method
Replies: 5
Views: 527

Re: Scaling Method

If RotD50 is the basis of scaling (the basis of the computed spectral ordinates for the ground motion records), the the basis of the input, specified target response spectrum should be RotD50 as well. So, in other words, you can go really awry if you, for example, specify a RotD100 target and scale ...
by huffte
14 May 2020, 18:24
Forum: 04-Unexpected behaviour/errors
Topic: Residual displacement/permanent deformation
Replies: 2
Views: 191

Re: Residual displacement/permanent deformation

I will add that residual displacement can vary from almost zero to a value slightly less than the maximum displacement, depending on the ductility level, post-yield stiffness, the period of the structure, degradation, and the ground motion, among other parameters. You cannot base a residual displace...
by huffte
08 May 2020, 15:02
Forum: 03-Analytical/modelling capabilities
Topic: nonlinear modeling of short links in EBF braced frames
Replies: 2
Views: 177

Re: nonlinear modeling of short links in EBF braced frames

Could you not specify a Takeda or simplified Takeda link element for the shear degree of freedom? It shouldn't require a bi-linear link necessarily.
by huffte
08 May 2020, 14:59
Forum: 02-Getting started with the modelling
Topic: RSA displacement
Replies: 4
Views: 325

Re: RSA displacement

Aslinn, are you getting displacements from the "Deformed Shape Viewer" or from the "Global Response Parameters" table? At least on my computer, on which I am running SeismoStruct 2020 Release 1 Build 1, the numbers on the plot are off by the factor specified in the response spectrum definition compa...
by huffte
18 Apr 2020, 00:06
Forum: 02-Analytical capabilities
Topic: Scale factor values
Replies: 1
Views: 237

Re: Scale factor values

You can apply any scale factor you desire. And you can be very simplistic or very rigorous in determining a scale factor. There are many options. Among them are: 1. Look at the target spectrum and the unscaled ground motion response spectrum and visually estimate a scale factor. 2. Scale the ground ...
by huffte
15 Apr 2020, 19:55
Forum: 02-Analytical capabilities
Topic: Velocity Response Spectra
Replies: 1
Views: 281

Re: Velocity Response Spectra

Hi nubufi. Note that your equations are for pseudo-spectral-velocity (PSV) and pseudo-spectral-acceleration (PSA). SeismoSignal reports both spectral-velocity (SV) and pseudo-spectral-velocity. While typically quite close over a wide period range, they are different and can be significantly differen...
by huffte
13 Apr 2020, 14:39
Forum: 02-Getting started with the modelling
Topic: Pushover using time history curves
Replies: 1
Views: 5844

Re: Pushover using time history curves

It's an interesting analogy, but I would say, not really. A pushover analysis involves pushing the structure to collapse / failure. An incremental dynamics analysis involves applying multiple ground motion histories scaled to progressively higher amplitudes. Inelastic behavior is implied in pushover...
by huffte
03 Mar 2020, 12:57
Forum: 03-Analytical/modelling capabilities
Topic: Progressive collapse under pseudo-static loading
Replies: 2
Views: 247

Re: Progressive collapse under pseudo-static loading

This sounds like a static pushover analysis. Consult the Help System and the Verification Manual to make a final decision on whether to use static pushover or adaptive pushover.
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...

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