Seismosoft | Earthquake Engineering Solutions

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...

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...

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...

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 ...

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...

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.

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...

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 ...

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...

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...