×
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

Notional horizontal forces

Notional horizontal forces

Notional horizontal forces

(OP)
Hopefully a quick question:

In the UK steel code, there is a requirement for frames to resist a notional horizontal force, in the absence of greater actual horizontal forces.

This notional horizontal force is defined as 0.5% of the factored vertical load.

Do US codes make a similar provision?

RE: Notional horizontal forces

There is something similar in the Uniform Building Code, but it is an additional rotational force which, if I remember correctly, added to the calculated torsional forces due to a seismic event.  This force is an additional 5% and is considered "accidental" torsion.  0.5%, as you noted isn't a very high value.

RE: Notional horizontal forces

Appendix 7 of the new AISC steel code has provisions for using notional loads.  It appears the minimum is 0.002 of the gravity load, or 0.2% (A7.3 (2)).  I don't know that this new code is yet referenced by any of our model building code but I expect it will be fairly soon.

RE: Notional horizontal forces

This load not very significant in the steel structures (except u have a heavy loads ) , You should to take this load only if the factored wind load < 1% dead load as Sec 2.4.2.4 in BS5950

notional load become more significant in the concrete structure  which equal to 1.5% of dead load  as BS8110.

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