Structural frame options in CD3D - peak ground acceleration (p.g.a.) values

Buildings Assessments Carbon Designer 3D
1

Hello,

I’m wondering if anyone has more detail on the peak ground acceleration (p.g.a.) values listed for high and medium seismicity frames in CD3D.

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Are these connected with IBC section 1613 maps or another standard map? Are these maximums, minimums or something else? Do they have a statistical rate of exceedance over a certain period (e.g. 2% chance of exceeding in 50 years)?

Thanks in advance,

Sonja

2

Hi Sonja! Thank you for your question, I have forwarded it to my colleague @Kostas who has been working on this project and he will get back to you as soon as possible.

3

Hello Sonja, thanks for reaching out. This is based on Eurocode 8, where PGA is typically provided for a 10% probability of exceedance in 50 years, corresponding to a 475-year return period. Overall, we would look forward to hearing your feedback and consider any further adjustments to better reflect local conditions and references. Please feel free to reach out to me also directly at kostas.koukoulopoulos@oneclicklca.com.

4

Thank you Kostas and Steven.
For the U.S. I was able to find a map with the 10% probability of exceedance in 50 years that I can reference.
I’m not a structural engineer, but it’s my understanding that most of the US uses IBC section 1613 and ASCE 7 (American Society of Civil Engineers) for seismic design, so in future developments it might be nice to have medium and high seismicity structures defined by the values from those codes/standards.

Thanks again!

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5

Noted. Thank you very much for the feedback Sonja! We will look into it.

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