All calculation for the roof and the deck are based upon:
- Deck loading of 40 psf live load and 15 psf dead load for a total of 55 psf.
- Deck under bar will require a 6,000 lbf load distributed over a 120 ft² area (50 psf) raising the load requirement to 105psf
- Roof Loading of 10 psf live load and 10 psf dead load for a total of 20 psf.
- 2,000 psf soil
- l/360 for the deck
- l/180 for the roof
Very handy beam calculator. – https://courses.cit.cornell.edu/arch264/calculators/example8.1/