Steel frame for supporting timber roof

[greznik91]

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.

 

[dik]

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

 

[Tommy385]

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..)