1981 6x6x5/16 Tube Column Fy=

[Jeng79]

Quick question, I am working with a building from 1981. I have drawings but there is no mention to the yield strength of the columns. The beams are 50 ksi.

I was just wondering if anyone had any thoughts on what was the typical yield strength of Tube Columns? I know that per the AISC 9th edition which came out late 80, typically it seams 46 ksi.

Thanks

 

[jike]

This goes back a long way in my memory but I thought we were using 42 ksi for tubes at one time and then switched to 46 ksi.

 

[nutte]

The 8th edition manual, which I believe came out in 1980, shows 46 ksi in their tube column tables. The availability table shows three types for square tubes, with a note that implies the 46 ksi version was most readily available.

A500 Grade A - Fy=39 ksi - Fu=45 ksi
A500 Grade B - Fy=46 ksi - Fu=58 ksi
A500 Grade C - Fy=50 ksi - Fu=62 ksi

The 7th edition manual, from 1970, has tube column tables for both 36 ksi (A501) and 46 ksi (A500 Grade B).

 

[jike]

nutte:

You jogged my memory....I think it was 36 ksi that we were using.

 

[msquared48]

Back then we always spec'd 46.

Mike McCann
MMC Engineering

 

[InDepth]

Why not check the loads and see what Fy is reasonable based on the loads.

Else perform a Charpy test or destructive sampling to verify the Fy.