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by huffte
05 Jul 2020, 19:34
Forum: 03-Analytical/modelling capabilities
Topic: Period of equivalent single degree of freedom system
Replies: 1
Views: 7

Re: Period of equivalent single degree of freedom system

Hi Koloubos. I assume you are referring to an 'equivalent sdof' used in direct displacement based design and analysis. I don't think you will find that, as there are multiple means of making that determination in the literature, while SeismoStruct is a full model with no need to reduce to an equival...
by huffte
27 May 2020, 00:11
Forum: 02-Analytical capabilities
Topic: Scaling factor significant figures
Replies: 4
Views: 53

Re: Scaling factor significant figures

Many Japanese records are very large, with 60,000 or more data pairs. One option is to specify a frequency of 2 and double the specified time step to read only every other value instead of every value, essentially cutting the record size in half. I have used this before several times. It will be imp...
by huffte
26 May 2020, 13:55
Forum: 02-Analytical capabilities
Topic: Scaling factor significant figures
Replies: 4
Views: 53

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: 147

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: 32

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: 21

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: 38

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: 52

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: 34

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: 5269

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...

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