×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Strength of 3/4" Mild Steel Nelson Stud Welded to 5x5x1/2" A500 Gr B Square Tube

Strength of 3/4" Mild Steel Nelson Stud Welded to 5x5x1/2" A500 Gr B Square Tube

Strength of 3/4" Mild Steel Nelson Stud Welded to 5x5x1/2" A500 Gr B Square Tube

(OP)
Hi:

I am trying to figure out whether a 3/4" nelson stud is sufficient to mount a fan on top of 5x5x1/2" Square tube. The nelson stud will be subjected to both tension and shear due to seismic load on the fan.

How do I calculate the allowable tensile and shear load on the stud? And what is the interaction equation between tension and shear components? I know how to do it for a regular A325 bolt, but am not sure how do the same for a stud

Thanks

StrainStress

RE: Strength of 3/4" Mild Steel Nelson Stud Welded to 5x5x1/2" A500 Gr B Square Tube

I am not certain how you plan to use the stud. They are typically embedded in concrete. ACI 318 appendix D is used to calculate the capacity when used as a concrete anchor. The shear capacity is in the Steel Construction Manual when it is used for composite construction. And, welding requirements in AWS D1.1, here are some other resources:

1977 Nelson Stud Design Manual can be downloaded from Sliderule Era's website: http://www.slideruleera.net/contributions.html
An ICC ESR also provides some information: http://www.icc-es.org/Reports/pdf_files/ESR-2856.p...

RE: Strength of 3/4" Mild Steel Nelson Stud Welded to 5x5x1/2" A500 Gr B Square Tube

(OP)
@ wannabeSE : Thanks for your response.

I am planning to use AWS D1.1 Type A general purpose stud (http://www.nelsonstud.com/pdf/pci.pdf), stud welded directly to the tube. The fan will then be installed using these studs and washers/nuts. Is this not an acceptable approach to mount an equipment ?

Also, in order to develop full strength of a stud, is there a min. yield/tensile strength requirement of base material ?

Thanks

RE: Strength of 3/4" Mild Steel Nelson Stud Welded to 5x5x1/2" A500 Gr B Square Tube

Oh, you mean a Nelson Sill Plate Anchor, not a Nelson Stud...

The sill plate anchor is just a piece of threaded rod, whereas the stud has a head on it.

Mike McCann
MMC Engineering

RE: Strength of 3/4" Mild Steel Nelson Stud Welded to 5x5x1/2" A500 Gr B Square Tube

I am guessing that you plan to use a fully threaded stud. Nelson stud manufactures a plethora of studs in several different materials: http://www.nelsonstud.com/Portal/Products/Fastener.... I think you need to download the entire catalog to get the section that lists the material properties.

I have only used Nelson Stud embedded in concrete (deformed bar anchors, concrete anchors/headed studs and shear connectors). I suggest you call Nelson Stud for the best answer. I assume you would need to check the stud similar to a A325 bolt except using the stud's tensile strength. If it is heavily loaded, the base metal may need to be checked for rupture and yielding. Chapter K of AISC 360 ( http://www.aisc.org/content.aspx?id=2884 ) may provide some insight on checking the tube steel. When the stud is shot on with a stud welding gun, the weld strength typically will not govern. See AWS D1.1 for minimum base metal thickness. But again, I have never used Nelson Studs in this manner. So, I am just throwing out some ideas.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources