×
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

Calculating deflection of simply supported sheet metal

Calculating deflection of simply supported sheet metal

Calculating deflection of simply supported sheet metal

(OP)
Hi,

I'm a little rusty and I'm trying to figure out how to correctly determine the correct thickness of sheet metal to use on custom concrete formwork.  For example purposes, lets say my supports are 12" o.c and I'm looking at a UDL of 1000 psf. I'm using 3mm sheet metal (11 gauge I believe).

Is there a simple formula for determining this?  I've searched for a while and it seams it may not be straight forward.

Thanks for any help in advance.

 

RE: Calculating deflection of simply supported sheet metal

Not likely something that will give you a meaningful answer.  Your system will most likely behave like a membrane and not a flexural plate item.

YOu might discuss this with a checker plate supplier or someone of that ilk and get an idea of how they implement in-plane stresses.

Dik

RE: Calculating deflection of simply supported sheet metal

If the horizontal span is 12" and the vertical span is very large (say more than 48") you could treat it as a continuous horizontal span.  The flexural rigidity D of the plate is Eh3/12(1-ν2) where E is Young's Modulus, h is thickness and ν is Poisson's ratio (0.3 for steel).  For steel, D is approximately 1.1*EI.

BA

RE: Calculating deflection of simply supported sheet metal


The two major US steel form manufacturers use 3/16" skin material with supports at 12" c/c and their systems are rated at 1,500 psf.  I would consider the life expectancy that you're trying to achieve (if any) - steel forms suffer from more abuse simply by virtue of the fact they're made of steel.  You need to consider connections as well - will the welds affect the surface of your form facing?  And then there's the reconditioning after being used & abused - your 1/8" skin will be more easily 'stretched' and more difficult to recondition back to a flat surface.
 

Ralph
Structures Consulting
Northeast USA

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