×
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

Crane outrigger loading type problem

Crane outrigger loading type problem

Crane outrigger loading type problem

(OP)
Hi There,

I have what I imagine is a simple engineering problem but cant seem to find a solution at present, so would be great if you could guys could shed some light.
the problem is similar to a crane with four outriggers but in this case the outriggers are fixed in all degrees of freedom (as if they are bolted in situ)

I am trying to find the distribution of load for each foot/outrigger for varying angles of slew and increase/decrease in moment assuming the platform is of uniform stiffness.
any help on this would be greatly received
Thanks in advance,
Ben

RE: Crane outrigger loading type problem

In a case like that, you can't determine loads at the outriggers without considering stiffness and deflection of the crane itself and of the surface to which it is attached. Depending on the details, that might involve frame software or finite element analysis. You might be able to make simplifying assumptions or determine some worse-case scenarios, but that would involve looking at more detail also.

RE: Crane outrigger loading type problem

If you have room in the design for an approximation, and the bolted connections don't require consideration of moment fixity, we've found that the maximum outrigger load is typically less than 50% of the total crane and pick weight (when the pick is over that outrigger, land based hydro crane w/o list, typical chart with large counterweight, etc).

It's been a while, but I also recall doing some calculations to find outrigger reactions just solving 3D FBDs and assuming rigidity everywhere.

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