Size a round log beam 2

[Manaz]

Hi,

I need to size a round log beam. Is anybody know how can I do that?
I also checked the woodworks, I did not find anything there.

 

[3DDave]

A) Carve a beam to be the right size?
B) Determine the size the beam should be?

 

[JAE]

So as an engineer you know how to design wood beams I presume?
And your question is more about what is the allowable bending/shear stress for a round log beam?



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[oldestguy]

If you have any Amish in your area, they do a lot with wood these days and I'd bet their advice would be free. Interesting that we get so used to having someone compute all the stuff we now find in tables. I had a summer job running thru the calcs for a table of long span joists just so a graduate engineer would not have to do that some day. Back to structures-1 class.

We engineers have gotten so damned lazy that I thought there would be help on the Internet. I'll be damned, here it is and I hope you thank me! All it takes is a simple search these days. Makes for very lazy engineers.

https://www.engineersedge.com/calculators/section_square_case_11.htm

 

[jtreybal]

Get a copy of ICC 400, the Standard on the Design and Construction of Log Structures. Contains design values for graded logs, properties, etc.

http://shop.iccsafe.org/icc-400-201...ign-and-construction-of-log-structures-1.html

 

[dhengr]

Manaz:
Jtreybal beat me to the punch by a few minutes. Logs are graded differently than sawn lumber and timbers, and by different grading agencies, and they actually have pretty good strength values. The thinking is that since you are not sawing through grain variations and orientation changes and through other stress raisers like knots, and exposing them on a face or edge, etc.; but rather, the natural growth strength and grain continuity is essentially undisturbed; they are actually superior to sawn lumber which is down-graded for all these material imperfections.

 

[msquared48]

International Log Builders out of Canada has a good publication too.

Mike McCann, PE, SE (WA)

 

[NorthCivil]

oldestguy,

+1. engineers are a damn lazy breed (in general). I'm guilty too, but try to be mindful and fight the inertia of it.