×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Open web crane girder suport conditions at column locations

Open web crane girder suport conditions at column locations

Open web crane girder suport conditions at column locations

(OP)
Dear Members,

I am designing a crane girder "open web type " due to heavy crane loads and large spans.  Crane capacities are two nos. of 50t and crane beam span is 24m. Crane beam has to design with top chord and bottom chord with web members. This crane girder will be supported by column in each end at both chord member points. To define the support points for these chord members , how define the type of supports for this crane beam?
Generally we define one end  with Pin and other end with roller supports for a simply supported beam . Due to four types of support points , pl. suggest me the type of support which gives the best optimized design.

Thanking you.

Regards,
KVRam

RE: Open web crane girder suport conditions at column locations

dear Kvram

50ton crane girder is a serious business and 24m span will govern your design. You are going to have a deep girder.

My five cents worth:

1) You have a lateral buckling problem no matter what girder you will use. Brace the top chord or the top flange appropriately. If you use trusses then consider a 3D triangular prism truss with a flat top. this will resist lateral forces. If you use plate girders then I would suggest box sections.

2) You have a stiffness requirement. Usually under crane load your deflection is required to be below l/600.

3) You may have a fatigue problem.  If your stresses govern then keep them well below your usual allowables and learn all you need to know on how fatigue is fought especially on weld details.

4) Your support conditions are simple. Usually sufficient rotations must be allowed at the end of girders by detailing properly, poor support details will eventually show themselves after a couple of crane runs.

If this is your first time with crane girders then I suggest you search for a typical girder and make sure you show your design to an experienced someone before application.

You may want to read AISE design of steel mill buildings further for basics of design.

respects
IJR

RE: Open web crane girder suport conditions at column locations

(OP)
Dear Mr. IJR,

Thank you for your detailed reply and valuable guidance. Surely I will present my deign calcs. with an expert like you before application.

Sorry for late response.

Regards,

KVRam.

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


Resources

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