×
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

Shear Walls In ETABS
3

Shear Walls In ETABS

Shear Walls In ETABS

(OP)
Hi To All
I am fairly new in ETABS and I have now a situation where not all the walls are to be used to resist the lateral seismic forces. Or on other words I have existing walls and I want to introduce to a structure new shear walls that should take the seismic forces up to a certain floor level.

The issue here is which is more correct:
1. Give the non-seismic walls a very low stiffness Modifier of lets say 0.001 for f11 and f12 in order to have these walls accept axial loads only.
or....
2. Shall i replace these walls with columns and have their frame release in shear moment and torsion and keep Axial load.

Your opinion is highly appreciated...

RE: Shear Walls In ETABS

2
If you can get away with not modeling the wall, that's a better way than to mess around with the stiffness modifiers on it.
Or model the wall to 6" below the slab, draw a couple (or as many needed) dummy columns to support the slab, and model the column with pinned ends. That way the wall will pick up axial but no moment.

RE: Shear Walls In ETABS

(OP)
@slickdeals
Thank you, it did work, and i also made the effort by deleting the walls that we do not need and adding columns instead and have them with pinned ends as you suggested. As for the deleted walls i added their self weight into the slabs.

Now I am trying to find if there is any UPLIFT at the ends of the shear walls, and i did the following...
1. Selected the points at the base that correspond to the ends of the Shear Walls and then got the results from Display/..Reactions/Support Reactions...
2. All load combinations selected are the DWAL#

But here i found out that all "FZ" are in positive,I hope here that the results are right. Or is my method wrong?


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