Gable Frame w/o vertical

[JStructsteel]

Got a ridge beam on a open deck that comes into end beams. Owner does not want a vertical post in the middle. he is ok with a tie at the bottom.

Playing around with details, I have come down to 2 options. Left is just tie bolts holding everything together, right is a saddle plate weldment for the connection. I know the best is the plates, but are there any other options? Maybe slots in the beams and a knife-flitch like plate hidden?

Load from ridge beam is about 6K, so not huge, but enough that I dont like the left one.

Thanks

 

[Eng16080]

I don't like the left detail. I doubt it would calc. out with 6k.

The right detail seems ok. I would probably use an alternative connection, though, with the top chords butted together with a flat top aligned with top of ridge beam, and a top mount connector (either Simpson or fabricated from 1/4" steel plates) to support the ridge beam.

 

[XR250]

Try detailing the rafter to ceiling tie connection and get back to us. That is the hardest part - with a 6k ridge load.

 

[JStructsteel]

Try detailing the rafter to ceiling tie connection and get back to us. That is the hardest part - with a 6k ridge load.

Thanks, good point. I will probably have steel down there too, but yes, getting anchors to work. Could always have a steel strap on top of the beam.

 

[phuduhudu]

For the base connection I have sometimes done this with a notch so that some of the tie force can be taken out in direct end grain bearing like below. If that's not enough then you need to add some steelwork. Can you not make the top connection work as with the left detail. I would only have a single bolt through as those double bolts don't have a lot of edge and end distance. The bolt is only there to tie things together and doesn't have any calculable force in it. Here again you are relying on the bearing of the ridge beam on the bit of rafter. If the bearing length is not enough then you could use a steel plate to widen it.

 

[jerseyshore]

They never like the vertical posts in the middle, but it is so much better if you are in an area with snow. Sell them on the fact that they can add some decorative webs on either side to make it a nice looking truss. It's up 8+ in the air anyway, it's not like vertical stub post is going to block anyone's view.

As XR said the heel connection is difficult with this type of design.

 

[lexpatrie]

This load, without any dimensions, seems unworkably large. You need a vertical.

And that notch detail screams no testing and cross grain tension or splitting. That looks like a cabinetry detail. Or Mortise and Tenon which I depends on generally large sections and lower forces.

 

[XR250]

I usually just make 'em run a vertical all the way to the foundation. Although, i just finished one similar to this but it was only 2k - so much easier.
Trying to resolve 6k in the unbraced horizontal beam is going to be difficult.