Axial Compressive Capacity of Threaded Rod to NZS3404

[moyseh]

Hi,

Just trying to work out the capacity in compression of an M10 rod to the NZ code. I am using this for the purposes of bracing some piping.

In NZS3404 they have different values for alpha_b (Table 6.3.3(1)) based on the section type. They obviously dont have this value for threaded rods.

Any help much appreciated.

Cheers

 

[bugbus]

I went through the same exercise recently. From memory, I went with alpha_b = 1.0 just to be safe.

From my CheckSteel software, they list the radius of gyration of the M10 bolt/rod as 2.15 mm, which seems to be based on the tensile stress area, rather than the (smaller) minor diameter area.

 

[dik]

That make sense...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Greenalleycat]

A thought on this, are you using 4.6 or 8.8 rods?
Obviously they have quite different material types and behaviours, with 8.8 being a lot more brittle
I would be nervous about any accidental eccentricity being introduced to the connection and the impact that it could have on the overall performance

 

[moyseh]

4.6 rods. Thanks for the help