Seismosoft | Earthquake Engineering Solutions

Just to be certain, it seems the ratio of moments is about 1.16. This is probably close to the ratio of Z/S. Before we begin investigating other possibilities, could you verify that you hand calculated moment of 260 is indeed Mp and not My? After you verify that, other possibilities can be explored.

I would suggest a couple of different options. 1. Load the seed accelerogram and identify ranges at the beginning and at the end which have essentially zero (or very close to zero) acceleration values. Specify a first line and a last line that eliminates these leading and trailing zeroes. 2. There i...

Hi Marcelo. I also use SeismoSignal 2021. I cannot reproduce the anomaly you describe. I have tried two different ways. 1. I opened the uncorrected accelerogram, baseline corrected and filtered the record, and selected "File", "Save Accelerogram As", and gave the record a new nam...

I think some details might help forum users respond to your question. What element type are you using? What does your structure look like overall in geometry? How many integration sections and discretized fibers are you using? Are you using force control, response control, or automatic control? What...

Cagatay, I never claimed that you were talking about the spectra of scaled motions. As I said, there are reasons one may want to scale the target design response spectrum. I won't repeat the possible example I previously gave. Perhaps you are assuming that SeismoMatch modifies ground motion by scali...

This is happening because it is precisely what is supposed to happen when you change the scale factor. If you are simply scaling records to your target, why do you want to change the scale factor from 1.0? The scale factor option enables you, for example, to scale one component of a record pair to 1...

I have sent both an email and a PM to you. Perhaps you have not received them yet?

One of the free sample models available at SeismoSoft.com is called "7-Span Bridge". This model is for dynamics time history analysis of a bridge with isolators and should be useful in learning. I hope it helps. If not, I can send along some additional models.

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 m...

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...