Contact US

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.

Students Click Here

crane beam - lateral bracing

crane beam - lateral bracing

crane beam - lateral bracing

Hello all:

When designing a beam to support a crane (the crane is suspended from the bottom flange of the beam), what is the best way to provide lateral bracing to the compression (top)flange:

a channel shape, legs down, welded to the top flange?

or horizontal braces at appropriate points?

RE: crane beam - lateral bracing

In the case you describe, I would say both are required to a certain degree.  The top flange channel addition would give you additional vertical stiffness and the channel/beam combination would allow greater spacing between lateral bracing (if needed) on the top flange.  This takes care of lateral torsional buckling.

You also have direct lateral forces to deal with for cranes.  With the crane suspended from the bottom flange, the lateral force required by AISC, for example, is 20% of the load, crane, trolley weights.  This comes in at the bottom flange and must be resolved through some kind of lateral bracing.  This is different, and in addition to, the lateral torsional buckling lateral forces.

The web of the wideflange cannot transfer this load from the bottom flange to the top flange as it has very little stiffness in that direction.

RE: crane beam - lateral bracing

Okay, thanks for the input.  

RE: crane beam - lateral bracing

From your question, I guess it is supposed to be a monorail which is unidirectional with lighter capacity. Since it is suspended from bottom flange of the beam at one location, it can be transferred through stiffners at that location and make a check for load transfer to its supports.
Cap channel will help you in case of top running cranes.


RE: crane beam - lateral bracing

1. Can anybody help in telling me how to design free standing Runway columns. What are the formulas used and what guidelines to follow?
We normally take 10% of the live load and the hoist wt and apply it to the top of runway column modeling it as a cantilever. Is this approach good. Any ideas?

2. Design of base plates for runway columns?
What if there is no pier or foundation and the floor is only 6" to 12" thick. How can i determine the size of the base plate for a runway column?

Thanks in advance

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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