Handling 16m long glulam beams (roof beams)

[Stefan1972]

The supports are assumed to stand firmly and without movement. I think you misunderstand the purpose of a continuous beam; what is pursued in these cases is higher material utilization on the horizontal (roof) beam. I tried to describe it in my previous post.

Yes, I completely understand what you mean, but when discussing this, it sounds as if either the ground is giving way or that there is a significant overload over the parts of the beam that have no support? I'm thinking more like if the roof is calculated in the Swedish way with lots of snow and is really well-dimensioned, then the loads should reasonably be so evenly distributed that you practically don't get these movements you mention and thus wouldn't need a whole beam. I would understand the logic if each beam were on the verge of being too weak, if everything were a lightweight construction deluxe and you'd have to shovel the roof all winter. Then I understand the logic that everything is calculated and that a whole beam would of course be more rigid.

 

[bossespecial]

I have q_d = 32kN/m from the roof beam on the central support (wall_x). Then you add the weight for wall_x and the weight of the footing. I haven't had time to calculate more than an overview, asked for drawings for the existing foundation. I want to calculate the current load on the ground.

If I get the opportunity, I will follow the project and calculate the final footing after they start digging.

I'm also calculating the slab, you're probably right that it can be reduced to 100mm, 6s150.

Thank you for sharing your experience! It is very helpful!

Simplified, you have about 40kN/m, so with 50kPa on the ground, the footing will be about 800mm wide, which isn't particularly large.
Will the extension be done with a new foundation, or will you use an existing one since you mention an existing foundation?

 

[HEA260]

Slightly simplified, you have about 40kN/m, so with 50kPa on the ground, the footing becomes about 800mm wide, which isn't exactly large.
Is the extension going to be done with new foundations or will you use an existing one since you mentioned existing foundations?

New foundations.

Forgot to include the wind load. We also have a horizontal load of 10kN.

 

[HEA260]

I assume you are aware that there is more load on the middle support when using a continuous beam?
It's easy to think that with evenly distributed load on the beam, the loads are distributed on the supports according to: 1/4, 2/4, 1/4, which is also true if the beam is split at the middle support. But with a continuous beam, this is no longer the case.

I'm aware of this, you assume correctly
It will matter for the dimensioning of the foundation. I have to compare the two cases. If I run with two beams instead of continuous, for example, it results in less ceiling height, something that is visibly different from the foundation. So I prefer to work with a continuous one in this case.

 

[HEA260]

The question of getting the beams up is to do it with a wheel loader with pallet forks if you can lay up the beams before the gable wall is built. Alt 2 is that a wheel loader can lay them just inside the gable wall and then you have to drag the beams afterwards.

Pouring 150 mm seems thick, more suitable for a tank garage.

Protte

I also need access to a wheel loader. It feels like it will both cost (which a crane also does) and become more complicated.

I wrote 120mm slab, not 150mm And it's preliminary, I'm going to try to calculate a 100mm slab.

 

[bossespecial]

New foundation.

Forgot to include the wind load. We also have a horizontal load of 10kN.

By the way, what have you calculated for the roof's self-weight?

 

[erikjakan]

Isn't it unnecessary to build with glulam if it won't be visible anyway?

Better to build such long eaves with light beams?

 

[HEA260]

What weight did you calculate for the roof by the way?

1kN/m2, exaggerated a bit when estimating.

Have set cc to 0.92m (fits perfectly for the width).

 

[HEA260]

Isn't it unnecessary to build with glulam if it's not going to be visible anyway?

Better to build such long eaves with I-joist?

I haven't looked at I-joist as an alternative (mostly because I haven't worked with it before). But I'll definitely check it out! Good idea if it works for the current span (9+6.2m).

 

[erikjakan]

I haven’t considered using light beams as an alternative (mostly because I haven’t worked with them before). But I will definitely look into it! Good idea if it works for the current span (9+6.2m).

I think it might be worth it, glulam is incredibly strong and attractive, but solid wood is expensive now as we all know

 

[HEA260]

I think it might be worth it, glulam is incredibly strong and looks nice, but solid wood is expensive now as we all know

I will check it out tomorrow, do you know any company you can recommend?

 

[Lulaua]

1kN/m2, exaggerated a bit when I've calculated roughly.

Set cc to 0.92m (fits perfectly for the width).

Do you mean that you will have the glulam beams on 920cc?

 

[HEA260]

Do you mean you will have the glulam beams at 920cc?

Yes, there will be a total of 5. Won't that work?

 

[prototypen]

Having beams with measurements other than the "standard solution" is a hassle. It results in a lot of puzzling and more waste. Trust me, I've renovated with ceiling joists with CC varying around 750 mm. Protte

 

[vanpire]

Thought about masonite beams?