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Can you find the site class from the PGA or the Mapped Acceleration Parameters?

Can you find the site class from the PGA or the Mapped Acceleration Parameters?

Can you find the site class from the PGA or the Mapped Acceleration Parameters?

(OP)
Hi,

I am wondering if the site class can be identified from the PGA for a specific site or the site Mapped Acceleration Parameters Ss or S1? If so, how?

Thanks,

RE: Can you find the site class from the PGA or the Mapped Acceleration Parameters?

ASCE 7 - 16 has Ss and S1 contours for the US. You can look up the values from multiple locations on the web including: https://seismicmaps.org/

However the Seismic Site class must be determined from the soil parameters or assumed, it cannot be looked up.

RE: Can you find the site class from the PGA or the Mapped Acceleration Parameters?

(OP)
I got asked a question recently that just threw me off. The question was three lines long,

PGA = 0.3
S1 = 0.9 (I think S1 was 0.9, but I don't recall exactly what the value was)
Find PGAm?

I know PGAm can be found using section 11.8.3 from ASCE 7-16 but the factor Fpga, is based on the site class not S1. Thus, I got confused on how to find PGAm. I am not sure if you have any comments that could help me solve this question.

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