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


Seismic Design Underground

Seismic Design Underground

Seismic Design Underground

I soon expect to be designing an underground building, small but possibly 2 stories high.  The buildings are usually close to walls (ribs), often in corners.  The client is OK with continuing deck framing at the column rows in order to attach to the rock walls using rock anchors.  If I do this, there is no relative deflection of the floor levels.  All the lateral loads go directly into the rock walls.

It would seem that no vertical bracing would be necessary. I would think that if I calculate lateral loads as if this were a braced building, this would be conservative.  These lateral loads would only load the deck diaphragms in tension and compression anyway.  Does this seem correct?  It seems like there is no sway in the building so that the floor levels travel shorter distances per cycle, that is, less load than normal buildings.  But for some reason, it seems to me that without the relative flexibility of vertical bracing or moment frames, the deck levels will be subject to more violent movement, that is, more load.

I would like to eliminate bracing and reduce column sizes if possible. Does anyone have any thoughts regarding this? Is my thinking correct?

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!


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