Laminated Wood Pole

[dmitriy555]

I have a laminated wood pole, that is subjected to a moment at its base, compression load is minimal. Does Section 3.9.2 of NDS 2005 Edition applies to wooden poles. Please see a copy of the NDS code. Is this equation for stability or member strength?

 

[msquared48]

It is for both stability and strength.

Note the l/d for stability (unsupported length) in the equations that will limit the bearing strength.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[dmitriy555]

but does it applies to poles? as they have insignificant amount of compressive load. adding both flexural components along the long side and the short side yields a value over 1.0.

 

[woodman88]

If you look at the "where" section you will note that at a value of 1 or more the equation (3.9-3) does not apply.

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

 

[dmitriy555]

at woodman88, sorry I don't understand your answer. could you be more specific and what is 'where' section?

 

[woodman88]

Look at your attachment. The page 21 upper left starts with "where" and give three equations that must be met for equation (3.9-3) to apply.

Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.

 

[dmitriy555]

According to he calculations, all three conditions are true. all actual stresses are a lot smaller than allowable stresses. Laminated pole is 50' tall, 18"x16" cross section. I use E=500,000psi.