×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Long Term Deflection

## Long Term Deflection

(OP)
Hi all experts,

Could you give me any sample calculation involving long term deflection using AS 3600-2018?
Its different from 2009 and that of 2009 is almost the same with ACI.

I know the code for Ief seems direct and easy for all of you but I would appreciate if there's any sample on it?

Thank you very much

### RE: Long Term Deflection

I can't post the calculation here but there's a similar calculation in the book 'Time-Dependent Behaviour of Concrete Structures' (Gilbert & Ranzi, 2011) - section 3.6.6. The formula for Ief is the same as AS3600 but the calculation of Mcr is slightly different. Gilbert & Ranzi use a Beta factor from Eurocodes rather than the Sigma,cs from AS3600.

Gilbert & Ranzi also don't use the long-term multiplier; they calculate the creep and shrinkage deflections separately and take account of the actual creep and shrinkage parameters of the particular concrete mix.

### RE: Long Term Deflection

Here you go:

https://www.sciencedirect.com/science/article/pii/...

This uses the Beta factor instead of Sigma,cs as I mentioned in the previous post, but it should be easy enough for you to substitute Sigma,cs if you want to. Beta is a simpler calculation though.

This also calculates the shrinkage and creep deflections using a rational method whereas AS3600's 'kcs' factor is really rough (but far simpler). If you want to use kcs, just multiply the instantaneous deflection by kcs. kcs is only for reinforced concrete though; you need a rational method for prestressed members.

### RE: Long Term Deflection

(OP)
This is a great help

Thank you very much!

### RE: Long Term Deflection

I'd suggest you do a search of this forum for further discussion on the use of the crude "kcs" factor.

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!