×
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

max allowable center point load on 14' span

max allowable center point load on 14' span

max allowable center point load on 14' span

(OP)
I am trying to support 200lbs on a 14' span. i am a project manager for a mechanical contractor and am not privy to all the math involved. i would prefer to use angle, but am not opposed to channel if it's necessary. My gut tells me 4x4x1/4 is safe, maybe 3x3x1/4. i would like to use beam clamps on the edge of the horizontal leg, but can drill closer to the vertical leg if i gain some capacity by reducing torsion. any help is much appreciated. thank you in advance.

RE: max allowable center point load on 14' span

Surely you have an engineer in the building. You need to engage them.

RE: max allowable center point load on 14' span

(OP)
I do not have an in house engineer.

RE: max allowable center point load on 14' span

My suggestion would be to hire one.

Designing stuff like this is performing engineering. You (or your employer) are open to a lot of liability by doing even simple tasks like this without a qualified person on staff.

I would venture to guess that no one here is going to calculate something like this for you- because we would not be willing to absorb an unknown level of liability should whatever you're building fail and kill somebody.

RE: max allowable center point load on 14' span

This post probably belongs somewhere other than in the "bearing" forum. Maybe structural.

What is the nature of this 200 lb load?
Permanent static?
One time lift?
Man lift?

To prevent the channel rolling from torsion, the load needs to be applied at the "shear center".
Counter to my intuition as a young man, that point is outboard of the channel, like this -
https://www.quora.com/What-are-methods-to-calculat....

RE: max allowable center point load on 14' span

(OP)
Thanks for the input Tmoose. It is permanent. It is air conditioning duct, so it isn't officially static, but the seismic forces of low velocity duct are pretty minimal.

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close