Link?

You can watch this and learn. 

https://www.youtube.com/watch?v=CzqZVDse-eI

Dear George,

Here are a few useful references.

Regards

Behrooz

https://wiki.csiamerica.com/m/view-rendered-page.action?spaceKey=perform&title=Static+pushover+methods+-+explanation,+comparison+and+implementation

http://www.earthquakespectra.org/doi/abs/10.1193/1.1586093?journalCode=eqsa

Dear George,

I think this link will be useful for you.

http://www2.ce.metu.edu.tr/~ce581/docs/Lecture%20Notes/Chapter%203/3.4%20Pushover%20Analysis.pdf 

I am searching for something to construct a code, not practical tutorials.

Dear George,

I think that you need to understand the sense of the procure before you want to construct a code.

Write code on what? Processing the pushover curve?

Check the following reference Please.. it might's assist you in your question … Regards…

https://www.fema.gov/media-library-data/20130726-1445-20490-2539/fema_440_part2.pdf

https://www.alacero.org/sites/default/files/u16/ci_23_-_24_the_pushover_analysis_explained.pdf

http://www.ce.memphis.edu/7119/Notes/PushOverExample.ppt

Dear George,

You can use the following file:

Dear George,

I think this following file is useful:

Dear Bekas,

I have attached a file for your kind reference. This article will help you to carry out the step by step pushover analysis using SAP software.

Regards,

Pravin