×
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

Metal Deck Shear Buckling

Metal Deck Shear Buckling

Metal Deck Shear Buckling

(OP)
Folks,
I have never worked much with calculating the capacities of bare metal decks and have a question.

I was recently reviewing a report where the shear capacity of a CF46 Metal deck (http://www.corusgroup.com/file_source/StaticFiles/Business_Units/International/Comflor%20Decking%20new.pdf) was calculated to be 16.1 MPa (2.335 KSI). It was mentioned that "shear buckling" controlled the capacity.

Where can I find information regarding how to calculate the capacity for metal decks?

We are Virginia Tech
Go HOKIES

RE: Metal Deck Shear Buckling

SDI's Diaphragm Design Manual is the industry standard for these calculations and provides information regarding shear buckling - it can be ordered here:  http://www.sdi.org/manuals.htm

As mentioned in a previous post you can also use Hilti's Profis DS program to determine shear strength of metal decks (including output for panel buckling/shear buckling strength) that match the Diaphragm Design Manual.  Download here:

http://www.us.hilti.com/holus/page/module/home/browse_main.jsf;jsessionid=40AC1D55C3E81347DF12752201C91443.node4?lang=en&nodeId=-153448

RE: Metal Deck Shear Buckling

I attach a pdf of a Mathcad 2000 worksheet for the calculation of the strength of trapezoidal deck sections.  Therein the formulas for web crippling and strength are extant. Since it is maybe 10 years that I did it and didn't annotate it, I don't remember the exact model code or book I was looking at when doing the sheet.

RE: Metal Deck Shear Buckling

(OP)
@Willis,
Thanks for the info. Where can I get more information regarding the various failure modes?

I am having a hard time picturing the shear buckling failure. I presume that this is out-of-plane and not in-plane. Shear forces can be traveling parallel to the flute or perpendicular to the flute.

In a direction parallel to the flute, I can see the flutes acting as stiffened columns. How does shear buckling happen in a direction perpendicular to flutes?

Also, if I can figure the equations in the SDI manual for shear buckling (Eq 2.3-3), which gives me a PLF value, can I then use this value and divide by a cross-sectional area / foot and calculate an equivalent shear stress?

I need to compute this because one of the reviewers is calculating a stress value (16.1 MPa / 2.33 KSI) and then asking to provide diaphragm shear stresses (S12 in ETABS) to prove the metal deck works.

We are Virginia Tech
Go HOKIES

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