Research in Natural Hazards Engineering > Damage & Loss (PELICUN)

Generation of Simulated Demands

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Jiajun:
Hello Adam,

Thanks a lot for the updated version 3.1.b4 of Pelicun. After watching the video about your introduction to pelicun on youtube, I started to learn pelicun 3.0. I'm sure that pelicun will be of great help to my research work.

I have a few questions, and I would appreciate it if you could help me.

1.Generation of Simulated Demands: In FEMA P58, if we want to address the effects of modeling uncertainty and ground motion uncertainty on demand distribution, we use two factors βm and βgm(FEMA P58 vol 1 Appendix G). So can we consider the uncertainty of modeling and ground motion to do the generation of simulated demands in pelicun?

2.I learned Pelicun3.0 by the example you provided on the website of DesignSafe(PRJ-3411 | NHERI SimCenter - Pelicun Examples). The example was helpful for my initial understanding of pelicun 3.0, but clearly not enough for further study. Is it possible to get more examples or API references about pelicun3.0 (even if it is a beta version)? Pelicun is an outstanding module. And I can't wait to get good at using it.

Finally, happy Labor Day to you !

Thank you so much,
Jiajun
My email:jiajundu99@gmail.com
My edu email:jiajundu@tongji.edu.cn

rezvan:
Hello JiaJun,

Definitely, Adam would help you way better, but I (as a user) personally think if you watch the tutorial videos on YouTube, you will learn much more.
I recommend you to watch the tutorials of PBE first and then move to Ver3 of Pelicun.

Here are the links:

https://simcenter.designsafe-ci.org/research-tools/pbe-application/
https://www.youtube.com/watch?v=0Cak4sxyvCI

I hope this would help.

Pooya,

Jiajun:
Hello Pooya,

Thanks for your suggestion which is very practical, and I will take it.

Best wishes,
Jiajun

adamzs:
Hi Jiajun,

Thank you for your interest in Pelicun; I am happy to hear that you find it helpful for your work!

Pooya: thank you for suggesting those resources for Jiajun; I agree that they are good starting points and help understand the framework.

However, the API changed with pelicun3 and most of the inputs have been streamlined. As soon as pelicun3 gets out of beta, the documentation (https://nheri-simcenter.github.io/pelicun/) will describe the behavior of the new version and provide an API to every method in it. Until then, your best resource is the forum and the Jupyter notebooks I prepare for the live expert tips.

As for your specific question on adding uncertainty to the calibrated demand distribution. Calibration of demands, unfortunately, did not fit in that FEMA P58 example. Pelicun3 does provide a function to calibrate a multivariate distribution to raw demand data. The result of such calibration is the demand parameter description that we prepare in the FEMA P58 example. We only provide the marginal distributions and assume uncorrelated marginals in the example for the sake of brevity, but you can provide a correlation matrix as well if you have such data available.

Would you like to first calibrate a distribution to raw data, or you already have the distribution parameters available and all you need to do is add the modeling and ground motion uncertainties? Both are possible in pelicun, but I'd recommend different procedures depending on what your objectives are. Let me know what you're looking for and I'll explain which methods to use to get the job done.

Adam

Jiajun:
Hello Adam,

Thank you for your detailed response for my questions.

In fact, what I want to do is to generate samples by the method mentioned in Appendix G of the FEMA P58 Vol1, and then use these samples to perform the damage and loss analysis. You can refer to the attachment for the exact process. This matlab code is provided by FEMA P58 in Appendix G. For this procedure, I just need to input the EDPs，βm，βgm.

Other than that, I have two questions:
1. I notice that the input of the raw demand in the example file seems to  be much different from the background document of FEMAp58, especially the log_std (I compared the input demand data with the data provided in the "Table 1-37 Demand Vectors, Intensity 3, Conditioned on No Collapse" in the BD document). I wonder about the reason for this difference.
2.This question is not related to this topic. It represents a personal expectation of mine. The environmental impact is a major update to the FEMA 2nd documentation, and the corresponding database is provided. After reading some current literature, I found that this is also a concern for many researchers. I wonder if pelicun is considering adding this feature as well. I checked the source code, it doesn't seem to be available for pelicun now. Or if I want to use pelicun to calculate the loss of carbon/energy caused by the earthquake, do you have any good suggestions?

Jiajun

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