I can help
Can you take a look at the following link and answer the questions at the bottom of the sheet? Your answers will allow me to accurately model the loading and size your beam. Thanks
Sorry for the delay, I have a few questions:
1. So you want to know what spacing you need for 36' clear span floor beams to support a 2nd story living space? When you say living space, do you mean a general residential occupancy?
2. What general range of spacing are you looking at for your 36' span beams? 15' or 20'?
3. Do you have any depth limits on your 36' span steels beams?
Let me know when you come back online.
If you could answer my 3 questions above, that would be great.