I decided to make a bunk bed for my room as it is small and I need a desk. I made a first design in this thread Make a bunk bed
But I realised that all the strength would be on the angle brackets and the screws. So I made a new design where the two main wooden beams are laid on the four vertical beams. It reduced the number of 3m wooden beams by two because instead of having 4x2m beams I had 4x1.4m beams.
I made some tests and saw that the main wooden beams could support about 1000kg but the slates could only support about 50kg. With the help of the bed, the weigh should spread on the other slates but I still would like to have your opinions.
If I had a center horizontal beam, the slates would have ~60cm on each side of the central beam and the support capacity would be much higher but I'm not sure wether it's well attached to the rest of the structure or not.
Did I use the sagulator tool right ?
Do you think I should put the center beam ?
Should it be attached better to the rest of the structure ?
if you regularly apply dynamic forces on it.It's easy to over-engineer a piece of furniture (I'm guilty of this myself from time to time). I don't think the forces you'll be applying to it (even if you engage in, ahem, adult activities with a consensual partner on the bed) will be enough to break your connections. Most furniture is way overdesigned for the loads that it takes since the sizes and proportions are based on what's visually-pleasing.