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Re: Strengthen wood beam -help

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You do not need to make the section composite as the steel has been sized to
carry the entire load and may only need screws to stabilize the steel
plates.  You could also stabilize with blocking and/or use a different steel
section: C-Series etc..
 ----- Original Message -----
From: "David Fisher" <dfisher(--nospam--at)fpse.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Friday, June 11, 2004 2:16 PM
Subject: RE: Strengthen wood beam -help


> Damn U of I guys...always need the Purdue engineers to help them out...
>
>
>
>
> Stan:
>
> Wouldn't the standard shear flow equation apply here?
>
> ([VQ]/[It])
>
>
> This should give you the horizontal shear in the bolt line
>
> (required between point of zero and maximum moment) as a function
> Of effective depth...
>
>
>
> Divide by the fastener capacity to determine the number of bolts...
>
>
>
> Or, do what Frank Lloyd Wright did when his engineering "fell short"
> As it often did...
>
>
> Use offset wire on each side to "post-tension" the wood section...
>
> (Think he did this on the Hanna house in Palo Alto)
>
>
>
> Good luck!
>
>
> David L. Fisher SE PE
> Fisher + partners
> 372 West Ontario
> Chicago 60610
>
> 312.573.1701
> 312.573.1726 fax
>
> 312.622.0409 mobile
>
> www.fpse.com
>
> -----Original Message-----
> From: Stanley E Scholl [mailto:sscholl2(--nospam--at)juno.com]
> Sent: Friday, June 11, 2004 3:58 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Strengthen wood beam -help
>
>
> I should have learned about this about 40 yrs. ago at U. of Illinois
> but----
> I must strengthen a couple of 4x8 roof beams at 3ft. oc. spanning 21 ft
> which are deflecting too much (and which are overstressed)
> I propose adding 1/4" x 7.25" plates on each side- after jacking up the
> beams, and using Simpson 1/4" x 3" SDS screws to attach the plates to the
> beams to make a Flitch Beam.
> Can anyone tell me the best method of determining if these screws will be
> adequate and what spacing should be used?
> I have designed the plates to take all the load.
>
> Stan Scholl, P.E.
> Laguna Beach, CA
>
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