Sign in to follow this  
Followers 0
wimp

lally columns

6 posts in this topic

Any structural engineers out there know anything about Lally columns. I have a house to renovate / design and am relizing that builders use lally columns without realizing how much load they are putting on them. Are there any load tables out there for Lally columns which are purchased at local lumber yards?

One site said the allowable load for a 3.5" dia 16 ga. column is 8.2Kips

are these columns really only 16 ga?? that's only approx .06" wall thickness!!

seems really low considering these columns are widely used in most residential construction.

any guidance would b e appreciated.

Share this post


Link to post
Share on other sites

I do not have a table for lally columns, but a 3-1/2" 16 Ga. stud 12'-0" long is good for about 3 kips. The circular section of the column will have better section properties resulting in a greater capacity.

Regardless, I would use standard pipe columns, and that's why I do not like doing residential work.

Share this post


Link to post
Share on other sites
I do not have a table for lally columns, but a 3-1/2" 16 Ga. stud 12'-0" long is good for about 3 kips. The circular section of the column will have better section properties resulting in a greater capacity.

Regardless, I would use standard pipe columns, and that's why I do not like doing residential work.

I agree, when I do new work, I use HSS square tubes, but this one is existing. I think I will have them replace them since we will be adding significant load to them.

thanks for the input

:thankyou:

Share this post


Link to post
Share on other sites

When you see the load ratings, be sure to note what assumptions were made - some tables that I have seen state eccentricity of load, yield strength of steel, and compressive strength of concrete used to fill the steel post.

Share this post


Link to post
Share on other sites

A quick search got me this link.

post jacks

As stated above, note that allowable loads assume concentric loading with a safety factor of 2.5. These guys a 11 ga

Share this post


Link to post
Share on other sites

Check this link for load tables

http://www.destefanoassociates.com/pdfs/te...lly_columns.pdf

The same laod table is usually available on Lally's website (http://www.lallycorp.com/index.html), but the site seems to be down right now.

You can't compare a Lally column to a 16 ga. stud because Lally columns are filled with concrete, which gives them almost all of their axial strength.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0