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


ASCE 7 - Natural Frequency in Each Direction

ASCE 7 - Natural Frequency in Each Direction

ASCE 7 - Natural Frequency in Each Direction

If a structure is flexible (NF < 1 Hz), then we must calculate the flexible gust factor.  If the structure has a stiffness which is significantly different in each direction,  do we still base the gust factor on the lowest natural frequency for the entire structure?  Or is the intent to determine the lowest frequency in the direction that is under consideration, and use that Frequency for the gust factor calculation?  

For example, if a structure has a Frequency of 0.7 Hz when looking at a direction, and 0.35 hz in the perpendicular direction, do we still use 0.35 Hz for the basis of G used in for wind pressures in both directions?   

RE: ASCE 7 - Natural Frequency in Each Direction

Determine G independently for each direction based on the predominant mode in that direction.   

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