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

Related Articles


Effective Seismic Weight

Effective Seismic Weight

Effective Seismic Weight

When determining the effective seismic weight, ASCE 12.7, do you include portions of the building isolated from the seismic force resisting system?  For instance, in a one story building with a floor slab that is isolated from the outside walls (shear wall system) is it necessary to include the weight of the slab + equipment into the calculation of W?  Although the definition given says to include weight of permanent equipment, this seems unnecessary if that weight isn't being transferred into the lateral force system.

RE: Effective Seismic Weight

I agree

RE: Effective Seismic Weight

If you are talking about the floor slab on the ground that is independent of the walls - then yes.  If there is another floor slab slight above the ground which adds weight to the walls vertically but is not connected for lateral reasons - I don't think I'd neglect it entirely.

Eng-Tips Forums:Real Solutions for Real Problems Really Quick.

RE: Effective Seismic Weight


You've got it right.

RE: Effective Seismic Weight

Make it simple.Include the weight of all those components which will experience inertial force because of the movement of slab above base.In one storey building any compoment isolated from roof and columns will not experience any inertial force.

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