Hello!
Sitting and pondering over the expansion of the workshop.
Current conditions:
There is a building measuring 10.5x6m built with isoleca on a slab that is about twice as large and thus not fully utilized. Interior ceiling height 2.8m.
Intended goal image:
New building partially "on top of the old one" which will be 13x10.5m and with 3.9m in interior ceiling height. Also with an upper floor for a coffee corner, office, storage, etc.
Since I have some steel lying around that I would like to utilize, I am considering laying 3 beams from end to end with support on the middle wall (one of the old long sides). I have 300mm IPE beams that I plan to use for this. The center-to-center distance between the walls is 5.9m and 6.9m respectively.
For columns, I was thinking of either using structural timber or 160mm HEA beams if they are strong enough.
In the beams, I plan to countersink 2x8 inches with beam shoes to support a clay tile roof and insulation.
Snow zone 2.5
My question to everyone who knows more about strength than I do, can IPE 300mm handle this with an almost 7m span.
Also, can a 160mm HEA stand vertically and bear the weight from the beams without buckling
Attaching a half-baked sketch from Google Sketchup of how I was thinking. The white walls are existing masonry and the red ones are new in wood.
If I understand correctly, the beams are a total of 13m long. If you make them in a single piece and lay them out as in your image, it will be a very strong solution. Offhand, I think IPE 300 can handle it with a good margin. HEA 160 as pillars shouldn't be an issue either, at least not for the gables; the middle pillars will take about twice as much load as the gable pillars, so these three should be checked to ensure that HEA 160 can handle the load, with buckling in the weakest direction being the main concern.
However, keep in mind that the middle pillars must have a solid base to stand on, as there will be many tons going down there.
Finally, I want to clarify that my reasoning above is based on gut feeling, and you should definitely have a competent structural engineer calculate this, as I don't have the expertise to assess this load case where both snow loads and wind need to be considered.
