4 1/4" x 16 1/4" glulam 5

[Triangled]

Hi,
I am to perform a site visit on a building with the above size glulams spaced 8' o.c. in San Diego to observe what the client says is a 4" sag and has been ponding. I have a framing plan with this size, dated 1962, but no specifications for these beams. Most glulams I have seen in the West are Doug Fir and sized 3 1/8"x and 5 1/8" x and up. I can't recall encountering this size before. I am wondering if this beam sizing might be familiar to someone and if you could guide me to additional engineering specs.

Thanks!

 

[msquared48]

A 4.25 X 16.25 is listed in the "Douglas-Fir Use Book", page 64. One of my copies is from 1958. I will scan the page and post it later. Pages 20 through 25 also talk about glulams of the era. Page 10 lists some stress grades, but not glulams specifically. You might check to see if the beams are stamped with a stress grade such as shown on page 9.

Mike McCann
MMC Engineering

 

[msquared48]

Here is the information:

FYI, in one of the calculation example pages for glu-lam arches, I did notice a reference to 2200 psi glulams, so they were around at the time and available. Whether they were used in your case is up to you to find out though. 1600 psi would be conservative for bending.



Mike McCann
MMC Engineering

 

[Triangled]

I really really appreciate that.

 

[dhengr]

Triangled:
When you really really appreciate, someone who has been really really helpful, like Mike has; that’s what the {“little pink stars” Like this post? Star it!} are for. You’ll find that right below Mike’s attachment box, in his second post. Click on it and see where it takes you, his effort deserves a LPS, from you.

 

[msquared48]

Thanks dhengr, and you're welcome Triangled.

Mike McCann
MMC Engineering

 

[Triangled]

downloads from msquared....
opens....
i'll be... there they are! 4 1/4 x 16 1/4

reads dhengr. i see, said the blind man.

find the pink stars

thank you too dhenger, i appreciate that too!

 

[Triangled]

Bought the book online for $4.
Thanks msquared.

 

[msquared48]

You're welcome. You won't regret the purchase.

Mike McCann
MMC Engineering