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!

*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.

Jobs

Maximum Deflection in a Beam

Maximum Deflection in a Beam

(OP)
What is the maximum deflection in a beam in bending according to AISC Steel Construction Manual 13th edition. I have the manual but cannot find where this is defined? I have heard L/360 but want to be sure.

I want to design roof rafters for a storage tank and want to know the allowable deflection in this case.

RE: Maximum Deflection in a Beam

The steel construction manual does not provide deflection limits as those are a serviceability limit state, not a strength limit state.  The IBC specifies a few basic minimum deflection limits for floors and roofs (of which L/360 or 1" is one); however, these are minimum code limits.  The final limits chosen for any project are based on the specific project, situation, materials used, and owner requirements based on engineering judgment and past performance - not code limits.

RE: Maximum Deflection in a Beam

very well said WillisV...  

RE: Maximum Deflection in a Beam

For a cylindrical aboveground steel storage tank with a uniformly supported bottom use API Standard 650 for petroleum liquids or AWWA D100 for water.  Both limit you to ASD design and neither have deflection limits, but both have other requirements.  Get the one for your tank or contract with an expert.

RE: Maximum Deflection in a Beam

What is the magnitude of the weight required to be supported by the steel rafters. Because of the nature of steel design, member sizing is typically governed by stiffness requirements. For roof rafters, I have always employed a span/500 deflection criteria for flat roofs (<4 deg) and span/360 otherwise.

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