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Re: FW: FW: built-up wood beam

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They relate to the manufacture of glulams here in the US.  I'm skeptical, maybe too much, of the ability of people to be able to add on a lamination in the field and make it structurally sound.  It's hard enough to do in a controlled environment like a manufacturing plant.  You can't just spread the adhesive and add a few clamps or jacks and expect any benefit.

<-----Original Message----->
   



-----Original Message-----
From: Gary L. Hodgson and Assoc. [mailto:ghodgson(--nospam--at)bellnet.ca]
Sent: Tuesday, June 06, 2006 7:07 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: FW: built-up wood beam

Timothy,
As we are up here in the great white north, we are not familiar with
those. Can you tell me a little more about them? I have the Canadian
Wood Councils Handbook but it does not touch on this topic at all. TIA
Gary

Timothy Allison wrote:
> Is the additional wood being added to beef up the beam for additional
> strength? If so, I would ask the designer if (s)he's familiar with
> ANSI
> A190.1 or AITC 200 for starters.
>
> <-----Original Message----->
>
>
>
>
> ----------------------------------------------------------------------
> --
> *From:* bcainse(--nospam--at)aol.com [mailto:bcainse(--nospam--at)aol.com]
> *Sent:* Monday, June 05, 2006 5:37 PM
> *To:* seaint(--nospam--at)seaint.org
> *Subject:* Re: built-up wood beam
>
> Gary-
> Have they considered just replacing the beam? By the time you go
> through the analysis, specification and construction process it may be

> cheaper just to replace it. If you do what is proposed, consider:
> 1. Is the hardwood plank at same moisture content as beam? (possible
> differential shrinkage) 2. What are the relative E-Values of the two
> wood materials? How will you determine these?
> 3. What load are you upgrading from and to? I.e., Is there a change in

> loads, an existing defeiciency, an aesthic issue?
> 4. What type of epoxy and what are the elastic modulus and shear
> strength values of it? Some epoxies are more flexible than others and
> that may affect how the two members interact.
> 5. How will quality of the gluing be assured. What controls will you
> require to prepare the surfaces, apply the epoxy, cure the epoxy and
> how will they be monitored.
> If you want to feel warm and fuzzy, burn the old beam in the fire on a

> cold winter's night and replace it with a new beam!
> Regards,
> Bill Cain, S.E.
> Berkeley CA
>
>
> -----Original Message-----
> From: Gary L. Hodgson and Assoc.
> To: seaint(--nospam--at)seaint.org
> Sent: Mon, 5 Jun 2006 08:46:49 -0400
> Subject: Re: built-up wood beam
>
> List,
>
> I have been asked to review drawings for a house addition, The
> designer has called for an existing beam (9h x 11.25v actual or
> nominal?) to be reinforced with a 2" x 11.5" hardwood plank glued on
> the flat to the bottom of the existing beam with an epoxy glue. I am
> assuming the original beam is S-P-F or Doug Fir as that is pretty
> standard around here. No grades or species were given. I have never
> heard of such a thing and do not want to comment on it if it is
> acceptable practise but it seems strange to me. The house is
> approximately 20 years old. I'm just wanting to feel warm and fuzzy
about this.
>
> TIA,
>
> Gary
>
>
>
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