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Steel frame for supporting timber roof

Steel frame for supporting timber roof

Steel frame for supporting timber roof

(OP)
Hi

Distance between masonry bearing walls at the top floor of a house is pretty large (10 m) so I have an issue with timber beams (large span for ridge and other beams that support rafters). So I have designed a steel frame that supports timber beams in the middle of bearing walls.

I have designed a tension tie at the bottom of a frame. This tie will be placed in a screed above RC slab.

What Im asking is how should I control steel beams at connections? I want to have wellded connections since I think its the easiest way to do it at a field.

I have seen an option B (diagonal cut in beam and welded with ful pen. butt weld) and option A which looks more stiff but I believe there were fillet welds.

Should I control connection right at the diagonal? Im not so sure what kind of cross section should I use when controlling a frame at connections since flanges are at angle and web is actually longer.

Sorry for bad language.










RE: Steel frame for supporting timber roof

I'd probably run with option A, and have an end plate moment connection at the haunch to avoid field welding and have smaller parts for residential construction.

Added: Check for lateral stability of the frame and beams.
Dik

RE: Steel frame for supporting timber roof

as Dik wrote, try to avoid welding on construction site.
I would use a RC Slab as a tension rod, 60 KN shouldn't be a problem (1,5cm2 extra reinforcement..smile)

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