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!

*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.

Jobs

ASCE 7 Cl. 12.4.2 & 12.5.4

ASCE 7 Cl. 12.4.2 & 12.5.4

(OP)
I am designing a steel structure in Seismic Design category E using Equivalent Lateral Force procedure. As per Cl. 12.5.4, I should consider 100% seismic load in one direction + 30% seismic load in perpendicular direction.
As per Eq. 12.4.1/12.4.2, I should also consider Ev+-Eh.
Should I apply 30% Ev while combining it with Eh, i.e. 100%Ehx + 30% Ehz + 30% Ev? Or should I consider full effect of vertical seismic load, i.e. 100%Ehx + 30% Ehz + 100% Ev?

RE: ASCE 7 Cl. 12.4.2 & 12.5.4

My first thought would be to use 100%Ehx + 30% Ehz + 100% Ev but I'm not near the code right now.

RE: ASCE 7 Cl. 12.4.2 & 12.5.4

(OP)
Thanks JAE.
When you have a moment, could you pleae look into the code and let me know your views.

RE: ASCE 7 Cl. 12.4.2 & 12.5.4

100%. Code actually handles vertical seismic load by using a fraction of the dead load and dumping it in with dead load in the combinations (see 12.4.2.3), so should always be 100% Ev barring either of the exceptions listed in 12.4.2.2, whether you have orthogonal loading or not.

RE: ASCE 7 Cl. 12.4.2 & 12.5.4

(OP)
Thanks MarkHirschi for your response.

Regards
H

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


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