Planning to build a carport with an open section as per the drawing.
Need to have a steel beam to save on height.
According to the engineer's calculations, it needs to be a HEA 340.
6533 span of the exterior wall opening.
Concrete tiles without insulation, snow load 2
Roof slope of 27 degrees
Seems well-sized, in my opinion.
Does anyone have insights on this?
6.5 meters is long. It takes substantial materials. Otherwise, you can go with a hefty glulam beam, or a post in the center of the length. Then you can reduce the size.
Sure, it's long but it's not a big construction.
I would think I can manage with a 450-495*115 glulam.
I think 260 HEA should be enough.
Now, I am a builder and not a constructor, but I've seen a bit regardless.
A 340 HEA will weigh nearly 700kg
I just want some other eyes on it because I think he has accounted for both belt and suspenders.
I would have liked to put a center post if it were up to me.
I think the dimension sounds exaggerated, but you have to consider that it's not just the span of the beam. You also have a 7m span on the trusses, which creates quite a large area that weighs.
No, but I will build it.
I can't calculate steel beams myself, so I got a simple calculation from a "designer".
I just think it sounds a bit too... right?
Otherwise, I'll have to persuade the customer to add another post and use glulam instead... cheaper and better according to me.
That's what happens if you want the opening on the long side. Not only must the beam withstand a lot, but the supports must also tolerate a great deal. I had the same problem and decided to install a middle post. A wide one so there is a distance between the cars inside the garage. The question is also where in the country we are talking about.
I think the dimension sounds exaggerated, but one should consider that it's not just the beam's span. You have a 7m span on the trusses as well, which creates quite a large area that weighs.
If we simplify and assume that the beam needs to support a 10-ton distributed load (snow zone 2 x 30m2 + roof tiles + trusses), my calculations indicate that a moment of inertia of about 10400cm4 is required to meet the rule of thumb that maximum deflection should be Length/400 (about 16mm in this case).
This is satisfied by an HEA260.
I have not accounted for any wind load, but on the other hand, there are multiple times the safety margin against plasticization (collapse) since this beam can deflect significantly more than 16mm.
If we simplify and assume that the beam should handle a 10-ton distributed load (snow zone 2 x 30m2 + roof tiles + roof trusses), my calculations show that an inertia moment of about 10400cm4 is required to satisfy the rule of thumb that the maximum deflection should be Length/400 (about 16mm in this case).
This is fulfilled by an HEA260.
I haven't accounted for any wind load, but on the other hand, there are several times the safety margin against plasticity (collapse) since this beam can deflect significantly more than 16mm
That sounds more right that was about the dimension I guessed.
Also a little margin for a "real winter day"
Wonder where he got HEA340 from then?
Could it be that he calculated pure point load, perhaps?
If the weight is of greater importance than the height, one can choose an IPE330 instead, which weighs about 20kg/m less and will probably be a cheaper solution as well.
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