Hello,
I was wondering if someone could help me with following question:
I am trying to perform IDA analysis and I downloaded FEMA-P695 (22 far-field records) recommended records. the problem is the PGA of the downloaded records differ from FEMA table. In FEMA it has been written that "After this work was completed, version 7.3 of the database was released, and some ground motion parameters differ slightly in the new version, such as PGV. Even so, the variations are small and have no tangible impact on the FEMA P695 Methodology".
So how can I be sure if I'm using a correct record? Does the downloaded records need any filtering or base line correction to make them as the records from FEMA?
Hi dear Sepehr Rassoulpour
I hope following article could helpful for you.
You can easily verify the data for filtering or baseline correction.
1. Baseline: Integrate your time histories and check for deviations in vel-time and dis-time histories
2. Filtering: Obtain the response spectrum and check the lower and higher frequencies especially in PSV and PSD, if you find any deviations your data is not filtered.
Further, go through this paper to get ideas on data processing.
https://www.sciencedirect.com/science/article/pii/S0267726104001708
Also, I can provide you with codes (Python and Matlab) to execute basic data processing. Alternatively, you can send me your 22-time histories, and I can check and let you know the condition.
Dear Sepehr Rassoulpour
I suggest going through this artilcle. It will answer your current query as well as others which you may have.
Regards
Rohan
Dear Rafael Salehin , Chaitanya Krishna , and Rohan Bhasker
Thank you for your answers.
Dear Sepehr,
In my idea, some key parameters, such as PGV, PGA, and shear wave velocity must be checked for validating selected ground motions. According to PEER NGA/Database, the baseline (displacement reaches to zero at the end of the earthquake) in most of the earthquake ground motions, in PEER (more than 95%), are corrected properly. Selecting of earthquake ground motions in FEMA-P695 (According to Baker studies) are chosen as standard earthquakes. Additionally, I did not find any recommendation about filtering of FEMA P695 ground motions.
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