I am currently working on modeling a steel structure with bolted connections, and I'm looking to incorporate the suitable rotational stiffness k. However, I've found that reference codes like EN 1993-1-8 (Eurocode 3: Design of steel structures - Part 1-8: Design of joints) can be quite intricate to implement. Are there any straightforward, step-by-step examples available to help me accurately estimate k?

I have also attached here the connection geometry for one of my cases.

Thank you