Timber Frame Models

[TimmyH76]

Hi all,

When you model TF frames do you put a joint (i.e pinned) at all connections. This seems weird b/c if you mortise into a meber it still has substantial capacity and won't really act like a hinge.

 

[apsix]

Pinned.
A glued mortised joint will have some moment capacity but your design should show that it is adequate if you are going to use it.

 

[MarcbSE]

Definately pinned. I have designed some "moment connections" for a timber structure, but only by using steel plates on each side of the timber with a lot of screws.

 

[TimmyH76]

What about in a situation when you have a rafter that is continuous and a collector tie is connected at mid span. That not really a pinned connection and this would through a moment into the rafter. Any thoughts?

 

[MarcbSE]

As far as the rafter is concerned this would not be a pinned connection since the rafter is continuous (not spliced), but for the collector to rafter I would consider it a pinned connection.

 

[TimmyH76]

That's what I would think as well (rafter not pinned). So at this point you would need to calacualte the section properties and anlyze for shear and bending at that point. Agree?

 

[MarcbSE]

Agree - taking into account any possible reduced section due to the connection if it were mortised, etc.