I did some calculations on a large "carport". I was thinking about approximately 12x4m with a post in the middle, creating two 6m gaps.

I entered this on byggbeskrivningar.se and it couldn't be resolved with what was in their database at least... .. 115x630 laminated timber doesn't handle this? Seems really strange... but I could easily imagine adding nogs according to the image below to strengthen it. Not that I think it's really needed but to make it structurally acceptable... How do you calculate this, I wonder? I guess you can't reduce the span by 100%, but hopefully, there's a rule of thumb...

Even 5m openings (if it had been 10m) are not possible according to the calculation tool...

I think there should be approved standard constructions that you can use as long as you stay within the dimensions, but I can't find anything...

The reason for the large gap is that I want to be able to back up trailers etc. from the side, hence it's okay with the nogs as long as you don't hit your head on them....

Illustration of a carport design with a central post, two open sections, and supporting struts, intended for backing in a trailer from the side.

Diagram of a large carport structure with dimensions and beam specifications, showing proposed sections and utilization degrees from a building calculation tool.
 
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