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Re: Compression ring bracing roof rafter for 8-sided slope roof with vaulted ceiling (gazebo)

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I've done quite a few, and even some that weren't polygons.  Just make sure that you tie the ridge together, and design the hip to top of ring connection intelligently.  Avoid low roof slopes, as the horizontal component and subsequent connection design gets too difficult for wood at low slopes.  Metal strapping around the perimeter is fine in most cases, higher loads may require specially fabricated tension connectors.
 
It's easy to over-estimate the loads if you look at 1 hip (the tributray area varies), and multiply by 8.  Try looking at the loads on the shape as a whole and dividing by the number of hips to determine your forces.
 
Pat Clark, P.E.
----- Original Message -----
From: Bao D Pham
Sent: Thursday, January 16, 2003 3:02 PM
Subject: Compression ring bracing roof rafter for 8-sided slope roof with vaulted ceiling (gazebo)

Hello,

 

I?m designing roof rafter of 8-sided slope roof with vaulted ceiling (gazebo).  The architect does not want to use collar ties.  He suggests using compression ring with strap around the wall top plate.  I?m not familiar with this compressing ring design and don?t know how it works.  I would appreciate any help on this.

 

Thanks,

 

Bao