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

Crack coefficients.........Sway and Non sway studies

Crack coefficients.........Sway and Non sway studies

Crack coefficients.........Sway and Non sway studies

I am doing a multi storey building of 20 stories as per ACI. In finding out sway or non sway stories as per aci chapter 10 we are checking that stability index is less than or equal to 0.05. Please any one confirm me that is it right to use crack coeffcients as per 10.11.1 and ultimate loads???...
Even in the study of lateral displacements, are crack coefficients used to study the same with service loads????
Any input or references would be appreciated.

RE: Crack coefficients.........Sway and Non sway studies

10.11.1 states that Pu and delta o should be based on the reduced Ig values.  This is the same Pu and delta o used in the sway/non-sway check in (Q = (Sigma Pu x delta o) / (Vu x lc))

Pu is an ultimate load
Vu is an ultimate load
delta o is the deflection due to Vu from a first order elastic frame analysis with stiffness values per 10.11.1


RE: Crack coefficients.........Sway and Non sway studies

Thank Q JAE.

RE: Crack coefficients.........Sway and Non sway studies


What is the limit of drift ratio and drift.

say stability index value is 0.059 say and drift ratio is less than 0.0013. Can this be ascertained as non sway story. Please suggest me exactly on this situation.

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! Already a Member? Login


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