Hey All, the octagon topic that was lost has got me thinking.
What do you all think.

Post to hip connection
Boss pin (no post running to the ground in the center)
Overhanging hips over the posts

How could you tie this with all the hip rafter thrust? Would the boss pin have to be short enough where you could half lap ties from post to post? One set half-lapped and the other half-lapped above? Do your ties half to intersect the boss?
Any ideas?

hmmm, this looks familiar

Welcome, Kyle. Any suggestions?

put some wedged dovetails on the ding-dang thing

Hi Mo, being Easter morning and all, I thought this looked a lot like a place for some steeple work. Maybe a crab with rafters up to the top of the King Pin. You could use some wedged dovetails for sure.

Here is something along this some line. Someone just brought up the question, Why do we use the term King Post? A post is a member in compression. Shouldn't it be called a King Pin or Boss Pin. The "Mob" must of borrowed the term from the building industry. And now we are borrowing it back. Tim

Is that a sketch up drawing... if so how do you post them? I've got a modified english tying joint that I did for a 12 sided polygon.

Carlos

Would you consider a ring of top plates on top of the posts, instead of connecting the post directly to the rafters? Then you'd have a "tension ring" formed by the plates. Set the rafter feet on the plate. CB.

Thanks, for the input.

Kyle, did not think about the wedged dovetail. I wonder with significant tension from a heavy load roof if the interrupted ties would work? But I suppose there aren't many options at the boss pin...

Carlos, Under File Menu, Export: Export 2d graphic and then post the same as a picture. If you don't know how to do that you can search the forum.

Daiku, Yes that seems like a good idea. What is then the best way to describe the post, plate, rafter area and its connections? Would you half lap the plates? What would then be the best way to connect the post to plates?

I think a "backed post" would probably be a good idea as well so you would not have un-level mortises and housings on the posts for the braces from plate to post and you would not have to mortise on an angle.

I like the idea of the tension ring around the top of the posts. I wonder if it is possible to have a tension ring at the bottom and a compression ring at the top, and eliminate the need for boss pin, ties...

Here's a pic of an octagonal frame I built (a scribe workshop - with the help of many) for a local museum back in '01



It is built with plates, though in this instance the plates do not act as a tension ring, the thrust is redirected and resolved at the inner ring, and tension and tension joinery was avoided to every degree possible.

It is possible to solve complex issues in the design phase, to build a traditionaly joined polygonal building.

Keep on keep'in on and playing with ideas.