×
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

Drift and Deflection ASCE 7-10 Table 12.12-1

Drift and Deflection ASCE 7-10 Table 12.12-1

Drift and Deflection ASCE 7-10 Table 12.12-1

(OP)
I'm hoping someone can identify this easy question. Table 12.12-1 of ASCE 7-10 gives allowable story drift for seismic loading.
Appendix C references the ASCE Task Committee on Drift Control, and states the commonly publicized drift limits for buildings as somewhere between L/600 and L/400.

The difference between Table 12.12-1 is a factor of 10. Am I reading this right in assuming that Table 12.12-1 is for seismic loading only and that
for other loads (like wind), I should be sticking to the L/400 to L/600 range?

RE: Drift and Deflection ASCE 7-10 Table 12.12-1

That is typically what I have done.

RE: Drift and Deflection ASCE 7-10 Table 12.12-1

The drift limits are for seismic only and include the deflection amplification factor, Cd. This computed deflection is not a service load deflection, it is an "ultimate" deflection. The ratios you have indicated for wind design are for wind service loading, more of an "allowable" load case versus a "strength" load case multiplied by Cd.

That's why the factor of 10.

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