I am planning to build a canopy and have some concerns about the loads when I skip a post in the corner. Here's what I've thought:
My rough calculations are:
Snow zone 1.5*1.2x4.1m=738kg snow load
Weight of wood about 70kg (guess)
Weight of glass about 100kg (multi-layer laminated solar glass)
=about 900kg
This load will be distributed 50% towards the house and 50% on the front beam, i.e. 450kg on the front beam.
The next thought is that 50% of the load on the front beam lands on the joist acting as a lever on the house, i.e. 225kg.
That's not exactly how it will be in reality since these are distributed loads, but it should give a fairly accurate answer to whether it will hold or not, I think.
The question then becomes whether the "lever" will handle 225kg without bending too much. It doesn't feel like there will be any problems with it breaking or that the house will be damaged. The "lever" will be bolted to the house's floor joist.
If you mount the side beam so that it can be considered as fixed, the deflection at the far end will be QL^3/3EI. This means that a 45x220 C 24 beam will bend down about 4 mm at the far end, assuming it is somewhat climate-protected (climate class 2).
Thank you, it's not much deflection (and in practice we will probably clear off the snow).
What percentage of the load capacity is it? Not even close to the breaking point, I guess?
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