I've calculated the beam over the winter garden, with supports 115x115 and a beam 495x115 with byggbeskrivningar.se
After some designing, I can conclude that I don't want such a high beam as it encroaches on the door height and air gap for the insulated roof construction.
Are there simple methods to switch this to a VKR or IPE, and still have the same deflection of 8 mm or less?
Length 4.6 meters excluding supports.
Snow load zone 2
Concrete tiles
After some designing, I can conclude that I don't want such a high beam as it encroaches on the door height and air gap for the insulated roof construction.
Are there simple methods to switch this to a VKR or IPE, and still have the same deflection of 8 mm or less?
Length 4.6 meters excluding supports.
Snow load zone 2
Concrete tiles
To replace the glulam beam, you need a steel beam with a moment of inertia of at least 7000x10^4 mm4. This means, for example, a VKR 300x200x6.3 or an IPE 300. When I calculate backwards, I get a load on the beam of around 20.5 kN/m, which is quite a lot. What load assumptions have you used?
it is a roof with a ridge beam, one side wall, and the other side opening (the beam I want to replace). The beam in the middle will be a 630 beam, and on one side, I will place wall studs under each secondary, but will have a support beam in the wall for possible relocation of any of the secondaries. cc is 1200 on these and they will be glulam 56x270. the roof angle is 23 degrees and concrete tiles. the roof area will be 4.7 x 3.5 = 16.7 m2 and on this, there will be dead load 50 kg, snow load 200kg, and various inconvenience 50kg. so the roof should handle 300kg/m2. generally, it will be 50% on the ridge beam and 50% on the eaves beam? so half of 5 tons should be 2.5 on the whole beam. but normally you calculate moment in the critical point which is then the middle to determine deflection and it is primarily that I am afraid of being too large or that I want a steel beam that corresponds to the same.
I should manage with 495 on both according to byggbeskrivningar.se (they might over-dimension something) but get 8 mm deflection on these, and that might be okay if you're up to shoveling snow but I don't know if I can and with a colder climate, we will soon be snow zone 2.5. I will install an expensive Schüco folding door system and don't know what happens in the middle if the beam goes down 8 mm.
I should manage with 495 on both according to byggbeskrivningar.se (they might over-dimension something) but get 8 mm deflection on these, and that might be okay if you're up to shoveling snow but I don't know if I can and with a colder climate, we will soon be snow zone 2.5. I will install an expensive Schüco folding door system and don't know what happens in the middle if the beam goes down 8 mm.
With those dimensions, I calculate the load on the edge beam to be 5.3 kN/m, approximately 540 kg/m. The deflection with a 115x360 will be a maximum of about 6 mm, and with a 115x315, a maximum of 8.7 mm. To be precise, slightly more than 50% will rest on the edge beam since you have an overhang. Since your section isn't dimensioned, I can't calculate it. Measure from the midpoint between the ridge and edge beam and include the overhang. I'm convinced you can solve the problem with glued laminated timber, where you have completely different possibilities to work with the relationship between height and width. Let me know the maximum deflection you can accept, and I will suggest a dimension.
A completely different point. If you use a breathable membrane on the roof instead of regular underlay felt, you can save the air gap and get a much simpler roofing solution.
A completely different point. If you use a breathable membrane on the roof instead of regular underlay felt, you can save the air gap and get a much simpler roofing solution.
Hello
I can accept a deflection of 6 mm at a maximum load of 200kg of snow.
I have updated the section with more measurements and included the building permit drawing of the section in the other direction, this is an early edition so not correct in all aspects but the measurements I have added are accurate.
I did not do as you wrote with the measurement but calculated it to be 2575 mm.
I can accept a deflection of 6 mm at a maximum load of 200kg of snow.
I have updated the section with more measurements and included the building permit drawing of the section in the other direction, this is an early edition so not correct in all aspects but the measurements I have added are accurate.
I did not do as you wrote with the measurement but calculated it to be 2575 mm.
Best answer
115x360 gives 5.7 mm deflection with the assumptions stated in post #4. You can calculate a bit more accurately than we have done, but in the end, the difference will be negligible. I think it seems like an exciting project!