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Re: Three Hinge Glulam Arch

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Chris

Since your arch is being designed for wet-use conditions (EMC of the wood
16% and greater) both the Modulus of Elasticity and radial stress design
values  would be affected by the wet-use factor. Csub D (wet-use factor) for
MOE is 0.833 and 0.875 for radial stress.

Methods and equations in the AITC Timber Construction Manual can be used
(for the 4th Edition, see pages 5-294 through 5-306).

Bruce Pooley
Timber Design
3448 South Newland Court
Lakewood, CO 80227
----- Original Message -----
From: "CDaniels" <ced(--nospam--at)larsondesigngroup.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, May 01, 2001 12:52 PM
Subject: Three Hinge Glulam Arch


I am currently designing a 3-hinge glulam arch roof (r=31.33', span=59') for
a roadway sand and salt shed.  I am using STAAD to model the arches (I
divided the arch into 20 equal straight line segments).  I did this for more
or less the convenience of manipulating the different load combinations
required.  My question is there any criteria I should be looking at for
deflection due to seasoning (i.e. shrinkage or swelling).  I know AITC has a
method for computing the seasoning effects on deflection and radial stress
for haunched or tudor arches but I have a true circular, constant section
arch and I expect the equilibrium moisture content inside the building to be
18 to 25%.  I don't any experience with glulam arch design.  Any input would
be appreciated.

Thanks,

Chris Daniels
Larson Design Group
ced(--nospam--at)larsondesigngroup.com

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