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!

*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.


AISC Manual (13th Ed.) Table 3-6, Max. Total Uniform Load

AISC Manual (13th Ed.) Table 3-6, Max. Total Uniform Load

Does anybody out there use this table? I decided to check it out recently, but it doesn't seem to be very user friendly. A few questions.

-Why do they bill it as a "Uniform" load table when they give it to you in kips? Assuming it means kips/foot will give you a moment far higher than the allowable.

-What exactly is the Wc (Uniform load constant) and why is it in k-ft? I've never seen this variable before.

If there is some insight out there I'd love to hear it. Thanks.

RE: AISC Manual (13th Ed.) Table 3-6, Max. Total Uniform Load

Don't have the AISC handbook in front of me, but assuming it's the same concept as the CISC tables then it's expressing the total applied load (i.e. [load/unit length] x span ).

So if you see 100kN as the load at a span of 2m it's a total load of 100kN spread uniformly over 2m or 50kN/m across the whole beam. I'm betting there's a series of diagrams in there somewhere that tell you what the equivalent tabular load is for a variety of different load conditions.

RE: AISC Manual (13th Ed.) Table 3-6, Max. Total Uniform Load

I find every engineer uses these tables in one form or another.

Recently I have been asked by fabricators to design connections for given project and every send of engineering drawings references using 1/2 UDL to design connections on beams where the load is not given at the end of the beam. It's frustrating to have a 3' long W12x14 that has a UDL of 85.6k meaning I need to design the connection to resist 42.8 kips.

All the answers to the questions you are asking can be found on page 3-27.

RE: AISC Manual (13th Ed.) Table 3-6, Max. Total Uniform Load

Beware that the notes concerning Wc on page 3-27 in AISC_13 are not correct. Errata from Feb 3, 2009 states:

The 4th paragraph should read, “The uniform load constant, φbWc or Wc/Ω (kip-ft),
divided by the span length, L (ft), provides the maximum total uniform load (kips) for a
braced simple-span beam bent about the strong axis.”

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!


eBook: Metal 3D Printing
Metal can provide strength like no other material can and, throughout our history on Earth, humans have learned to harness metals for ever greater specialized applications, from radiation shielding on spacecraft to conductive components on circuits. Download Now

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