I'm planning to build a storage shed on piers, measuring 7000*9600. I plan to dig 3 rows of piers so I'll have 2 compartments, each 9600 long with 3500 mm between. The piers will then be 2400 mm apart, resulting in 5 piers in each row. I will place 100*100 on the piers and set posts on top with dimensions of 100*100 length 3500 mm; on the middle pier row, the posts will be 4500 mm. The support beam will be 50*250, and the middle pier row will have a double support beam of the same dimension. The roof beams will be 50*250 cc1200 with plastic battens and a metal roof on top. The snow load zone is 3 and I don't want to have to shovel the roof. The wood dimensions are due to purchasing them at the right price, but will it hold?
The weak point as I see it quickly is the center row with posts. They are too long regarding the risk of buckling. The simplest solution is to replace them with glulam, 115x115. I then assume that the posts in the walls are stabilized laterally through outer panel and inner panel/noggings.
There will be no panel on the outside, there will be battens with cc 1200 mm of 50*130 on which facade metal trp20 is screwed on, on the inside there will be nothing. I suspected that the posts in the middle row might be a bit too weak since they will be about 4500 mm long, so I was considering adding a 50*200 on 2 sides of them. Do you think that will be enough? I already have the timber, so I'm not keen on buying laminated wood.
Do not want any hanbjälke, in the future will become a loft of about 1/4 part, thinking of nailing 50*200 standing outside 100*100 but can put a middle liggare at 2000 height if it helps.
If you don't want a hanbjälke, I suggest that instead of 2 pieces of 50x200, you mount 2 pieces of 50x75 lying down and secure them with a through bolt.
I understand that the method will reinforce the poles along their length as they support each other, but how can it help stiffen them sideways when they become essentially freestanding sideways?
It works similarly to cross-bracing but in a different direction. In normal frame constructions, there is no need to consider the risk of buckling because noggings, panels, and sheet materials stiffen the construction. In a post structure, other methods must be found. One alternative is to replace the posts in the middle row with regular studs with a rectangular cross-section, e.g., your 50x200. The minimum size is probably 45x145. Then it's sufficient to brace them lengthwise.
Preferably want to avoid braces that may get in the way in the future. Probably going with a 100*100 post with a 50*200 nailed standing on each side, they will be quite sturdy posts, should hold, right?
It probably won't fall apart right away. The problem when giving advice to others is that you don't want to write something you can't stand for. Perhaps my comments have been of some use after all?
No, I don't think it will collapse either, but there will also be snow and I don't want to shovel the roof. All ideas are good, some you take with you this time, some you might use another time.
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