×
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

Differentiating gravity walls from shear walls in ETABS

Differentiating gravity walls from shear walls in ETABS

Differentiating gravity walls from shear walls in ETABS

(OP)
Hello all,

I am working on a two-story concrete structure with my firm for the first time. I have modeled all structural elements and applied auto quake loads. Note: the senior designer has hand calculated the entire structure, and I am verifying etabs results as we hope to switch to using ETABS/SAFE for all our concrete projects.

My question is: do walls that are not assigned pier labels contribute towards lateral stiffness?

I.e: I have a core that I am designing for 100% of the earthquake loads. There are other walls that for the purpose of this validation I do not want to include in seismic calcs. How do I ensure my perimeter walls are not acting as shearwalls?

I am considering perhaps that I need to assign Pierre labels to all walls in order to get the gravity design information, but as she releases in the respective directions for these walls that I don’t want to include.

Thanks!

RE: Differentiating gravity walls from shear walls in ETABS

You could use shell area property modifiers to model walls which acts as a bearing walls with zero in-plane and out-of plane shear stiffness.
To release in-plane shear stiffness, use a very small value in shell area property modifiers f12.
Similarly, to release out-of-plane shear stiffness, use a very small value in shell area property modifiers M22.

Don't use an exectly zero value, because it could create numerical problems in your model.

Quote:

My question is: do walls that are not assigned pier labels contribute towards lateral stiffness?
Pier labels are related to design of shear walls. Software reports average design results for piers with assigned labels. Pier labels has nothing to do with the stiffness of a wall.

I'll advise you to study in depth about the relevant features before using them.

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

White Paper - How ESI is Helping Move New Medical Device Product to Market Quicker & More Cost Effic
Early Supplier Involvement has long been a strategy employed by manufacturers to produce innovative products. Now, it almost seems like a necessity. Because decisions made in the design phase can positively affect product quality and costs, this can help add value to OEM bottom lines. This white paper will discuss many facets of ESI, including why it’s so valuable today, what challenges limit the benefits of ESI, how cost is impacted, and more. Download Now
White Paper - Moving to a Driverless Future
This white paper describes what we see as the best practices to support a sustainable engineering process for autonomous vehicle design. It exposes how to use simulation and testing in common frameworks to enable design exploration, verification and validation for the development of autonomous cars at a system, software and full-vehicle level to drive a mature product development process for automated driving. Download Now
Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. 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