Hello!
After some helpful pointers from this forum on my last thread I researched further on my project and consulted with some professionals.
To sum it up:
Two stacked beams like attached picture.
(The reasoning for this arrangement is that the two beams were given to me for free, and they would not support the load on their own. They will be connected to act as a composite.)
Connection will be bolts through the flanges on each side of the web. The shear plane is on the non-threaded parts of the bolts.
The shear flow is calculated to 210N/mm at the edge supports.
3 options
1: M20 bolts spaced 120cm apart
2: M12 bolts spaced 30cm apart
3: M12 bolts spaced 20cm apart
These can all without issue handle the shear flow.
I had almost decided on the M20 path to save me magdrilling 60+ holes but checked AISC/Eurocodes again and stumbled across something interesting
If i'm reading this correctly, they stipulate a maximum bolt spacing at 200mm (Eurocode) and 300mm (AISC) no matter what (?!)
Now, everything i read about this in commentary or sources is about inhibiting rust and corrosion. Eurocode stipulates unlimited spacings in some instances, but WHEN is not totally clear to me.
My structure is completely indoors in a heated building, does it still make sense to apply this part of the code? I understand to limit buckling, but that will hardly be of issue. Is it even relevant to my scenario? I will be designing for Eurocode
Thanks for reading my long post, and I look forward to your responses
(Disclaimer: This is a small garage built on my own land that i'm wholly responsible for, I'll follow the most stringent code if necessary. Just a few more hours on the mag drill)
After some helpful pointers from this forum on my last thread I researched further on my project and consulted with some professionals.
To sum it up:
Two stacked beams like attached picture.
(The reasoning for this arrangement is that the two beams were given to me for free, and they would not support the load on their own. They will be connected to act as a composite.)
Connection will be bolts through the flanges on each side of the web. The shear plane is on the non-threaded parts of the bolts.
The shear flow is calculated to 210N/mm at the edge supports.
3 options
1: M20 bolts spaced 120cm apart
2: M12 bolts spaced 30cm apart
3: M12 bolts spaced 20cm apart
These can all without issue handle the shear flow.
I had almost decided on the M20 path to save me magdrilling 60+ holes but checked AISC/Eurocodes again and stumbled across something interesting
If i'm reading this correctly, they stipulate a maximum bolt spacing at 200mm (Eurocode) and 300mm (AISC) no matter what (?!)
Now, everything i read about this in commentary or sources is about inhibiting rust and corrosion. Eurocode stipulates unlimited spacings in some instances, but WHEN is not totally clear to me.
My structure is completely indoors in a heated building, does it still make sense to apply this part of the code? I understand to limit buckling, but that will hardly be of issue. Is it even relevant to my scenario? I will be designing for Eurocode
Thanks for reading my long post, and I look forward to your responses
(Disclaimer: This is a small garage built on my own land that i'm wholly responsible for, I'll follow the most stringent code if necessary. Just a few more hours on the mag drill)
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