Rafter to Pole Plate Concealed Connection 1

[jrbaus]

I have a small project at the moment where the client wants to install a leanto off the front of an existing dwelling. The site is located in Australia with a very dry, hot climate and low wind loads.

The client does not want to use metal hangers to make connections between timber elements as they will be left exposed. I could not find a suitable connection in the residential framing code AS1684.2 so designed the connection for shear, bending & bearing taking the reduced section properties into consideration. I am not sure what effect notching the hardwood will have in such environment though and am concerned about potential splitting. Can you please share your thoughts on the attached detail?

I guess the other (safer?) option would be to use something like this:

http://www.dhcsupplies.com/store/p/3739-CJT6S-Concealed-Joist-Ties-Short-Pins.html#.VHz8psn8IuQ

Kind regards,
Jake

 

[JAE]

Sorry - I missed the 35 mm part.
Perhaps you are right - but with a pre-drilled hole there would be less outward pressure upon installation of the screw - using many small diameter screws still seems feasible.
You can get 1/4" diameter x 12 inch long lags.

Check out Eng-Tips Forum's Policies here:
faq731-376

 

[msquared48]

I agree it would help, but I still would not do it. The OP was asking how to mitigate splitting, and I would start by providing a detail where that will not occur. I feel that that is what I drew up. No worries.

Mike McCann, PE, SE (WA)