Hello
Is there someone knowledgeable in calculations who can help me with what dimension I need for the load-bearing beam in my floor structure?
It's the load-bearing beam that will run through the middle of the house in the picture below that I need help with in a 1.5-story vacation house. There will be posts supporting it on each side of the stairs, so a total of four supports.
With normal residential use, the support beam should be in glulam 90x315. This results in a deflection in the middle of spans that are 3750 mm, L/600. Order a whole glulam beam, it's always best.
With normal residential use, the bearing beam should be in glulam 90x315. Then the deflection in the middle of the spans, which are 3750 mm, will be L/600. Order a whole glulam beam, it will always be best.
Ok, thank you very much, had hoped to manage with 270 mm height, but 315 should work too
The requirement is likely a maximum deflection of L/300, so in theory, a 270x90 could work.
But Justus is the expert here. Perhaps you'd really want to avoid deflection?
I myself have a 225x90 with a span of 2700 that I got calculated by an accredited engineer, and I think it looks slightly bent... It's hopefully just in my head. But a 315x90 would certainly feel better...
If you increase the width, you can manage with a 140x270, but it will be more expensive due to the larger volume. The main beam is a primary structural component that requires higher standards compared to regular floor joists.
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