Beam Size ?

Posted by Rima Neas on February 18, 2007, 7:33 pm

I am trying to find 4x beam size to get L/480 or less deflection with
Structural Select Doug Fir and 10 + 60 PSF loading.

Span 124" supporting 86" of joist --> 5200LB total uniform load
Span 56" supporting 89" of joist --> 2500LB
Span 108" supporting 42" of joist --> 2250LB

"Sagulator" computations gives me 4x12 for the first and 4x8 for the other
two. Anyone with data tables or better software: does this look right to
you?

Are there other *free* online tools for this? (I used the AWC calculator
for joists)

Cheers, Shawn

Posted by Bob Morrison on February 19, 2007, 11:12 am

In a previous post Rima Neas wrote...

> "Sagulator" computations gives me 4x12 for the first and 4x8 for the other
> two. Anyone with data tables or better software: does this look right to
> you?
>
> Are there other *free* online tools for this? (I used the AWC calculator
> for joists)
>

The beams look to be about right for the criteria given.

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by Rima Neas on February 19, 2007, 4:38 pm

> The beams look to be about right for the criteria given.
> --
> Bob Morrison, PE, SE
> R L Morrison Engineering Co
> Structural & Civil Engineering
> Poulsbo WA
> bob at rlmorrisonengr dot com

Thank you for checking.

Posted by RicodJour on February 19, 2007, 11:47 am

Rima Neas wrote:

> I am trying to find 4x beam size to get L/480 or less deflection with
> Structural Select Doug Fir and 10 + 60 PSF loading.
> Span 124" supporting 86" of joist --> 5200LB total uniform load
> Span 56" supporting 89" of joist --> 2500LB
> Span 108" supporting 42" of joist --> 2250LB
> "Sagulator" computations gives me 4x12 for the first and 4x8 for the other
> two. Anyone with data tables or better software: does this look right to
> you?
> Are there other *free* online tools for this? (I used the AWC calculator
> for joists)

There are free services on the other end of your phone as well. Your
friendly local truss/engineered wood fabricator/supplier will be more
than happy to take your faxed design criteria and size the required
beam for you.

For a background on why I'd recommend using engineered wood:
http://www.umass.edu/bmatwt/publications/articles/sizing_engineered_beams_headers.html

DIYer table, pay particular attention to the notes at the bottom for
your required deflection conversion.
http://www.huberwood.com/emplibrary/ACF36C6.pdf

R

Posted by Rima Neas on February 19, 2007, 4:45 pm

> There are free services on the other end of your phone as well. Your
> friendly local truss/engineered wood fabricator/supplier will be more
> than happy to take your faxed design criteria and size the required
> beam for you.
> For a background on why I'd recommend using engineered wood:
>

http://www.umass.edu/bmatwt/publications/articles/sizing_engineered_beams_headers.html

> DIYer table, pay particular attention to the notes at the bottom for
> your required deflection conversion.
> http://www.huberwood.com/emplibrary/ACF36C6.pdf
> R

Thanks for the info, much appreciated. The last URL does not work for me...
perhaps it is accessible only to employees from the inside of the firewall?

Cheers, Shawn

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