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

PT Slab Property Modifier

PT Slab Property Modifier

PT Slab Property Modifier

What Slab property modifier do you guys use for PT slab modelling in ETABS, note model will be for lateral analysis, not slab design.


RE: PT Slab Property Modifier

The stiffness modifier that best represents the behavior of the slab element. Thin slabs up to 250thk generally F11,F22,F12,M11,M22,M12 = 0.25 to 0.35. As the slab get's thicker this number would get up to 0.5 to 0.7

RE: PT Slab Property Modifier

F11/F22/F12 are the in-plane axial and shear stiffness, I wouldn't be reducing those for a slab intended to act as a diaphragm under a lateral analysis?

You'd only typically reduce the flexural properties to suit whatever your effective cracked stiffness was if you were trying to capture the shell stiffness contributing under lateral load cases. Typically, though I'd usually just use a "membrane" shell element type and just rely on the lateral system provided to carry all of the lateral load.


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


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