Smaller ridge beam with three props

[nauleem]

I have used the Swedish Wood's dimensioning tool to calculate the dimensions of the ridge beam. I'm wondering by how much (%) the dimension of the ridge beam can be reduced if I add a support in the middle. Is it also possible to reduce the dimensions of the horizontal beams?

 

[Oldboy]

If the truss in the middle is correctly dimensioned so it can take the load from the middle of the roof and transfer it out/down to the wall posts, it is possible to calculate the ridge beam as two separate ones. That is, one to the right and one to the left (according to the image). (Assume that the beam calculation template from Svenskt trä is not made for middle support/three load points?)

 

[nauleem]

If the truss in the middle is correctly dimensioned so it can take the load from the middle of the roof and transfer it out/down to the wall studs, then it is possible to consider the ridge beam as two separate ones. That is, one to the right and one to the left (as per the image). (I assume the beam calculation template from Svenskt trä is not made for middle support/three load points?)

Thanks, the tool does not have the ability to calculate three load points. I haven't found it.

 

[Byggkonsult89]

Yes, exactly if the central support is well placed and adequately load-bearing, the span can be divided, and each half can be calculated separately. This can provide a significant dimensioning advantage as the moment in the middle decreases considerably. However, it's important to be sure of how the load is truly distributed, especially if the roof has different slopes and snow zone 2.5 is relevant.

The Swedish Wood template generally assumes a simple support form, so central support must be managed outside of that or a more tailored calculation should be employed.

 

[LevaLivet]

For the ridge beam, you can choose to add more supports. I don't have the "calculate" step available right now, but from the image below you can see that I have chosen 3 supports