×
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.

Students Click Here

fork truck loading on an elevated slabs
2

fork truck loading on an elevated slabs

fork truck loading on an elevated slabs

(OP)
Just curious about methods to analyze fork truck loading on elevated slabs (either concrete or steel). Typically we use the AASHTO method to back calculate uniform distributed loads. We have also used finite element modeling and toyed with the idea of using yield line theory.

RE: fork truck loading on an elevated slabs

Westergaard, a professor at the University of Illinois, issued a comprehensive report in March of 1930 to the Bureau of Public Roads "Computation of Stresses in Bridge Slabs due to Wheel Loads".  I believe Westergaard's report is the basis for the modern day AASTHO requirements. The AASTHO spec., unfortunately, has taken Westergaard's recommendations and converted them into engineering data that works only for truck loads and bridges. Building engineers must work with varying wheel bases, axle lengths and tire contact areas. You must go back to Westegaard's original report to find useful information.  You should be able to order this report thru your Public Library.

Ignore all the theoretical equations, unless you can understand them (I can't). You will find several useful charts. One will give you coefficients for calculating the maximum bending moments for the main steel as well as the distribution steel for both simply supported and fixed edge one way slabs. Others will give coefficients to calculate the additional bending moment due to adjacent wheel loads for both parallel and perpendicular arrangements.

Another will give you the theoretical negative moment when a wheel load approaches a fixed edge condition as P divided by PI. A fixed edge condition can be approached when the wheels perfectly stradle a rigid beam, supporting wall, etc.

If the wheel load is only on one side of a rigid beam or wall support, a report by Vernon Jensen, has determined that the theoretical negative moment would be P divided by 2 PI. This makes sense.

I have found these charts to be very useful for over 30 years in building design. They will give you quick, accurate answers without having to resort to a finite element model or other approximate methods. I hope this helps.




RE: fork truck loading on an elevated slabs

maiorano,

One of the really big thinks to look at with forktrucks on elevated slabs is the impact forces of starting and stopping the forktruck with a load on it.  That can induce quite a load into the elevated slab and requires lateral bracing of the framing.  

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