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

Capacity analysis of two-way slab

Capacity analysis of two-way slab

Capacity analysis of two-way slab

I need to check an existing 8" thick two-way concrete slab for an eccentric distributed load of mechenical equipment of 60 PSF. The dead load of the slab is 100 PSF in addition to permanant dead load of 40 PSF. The total load on the panel is 200 Psf. It is a 24'x15' typical interior salb panel. The existing salb was reinforced with #4 @ 12" Each Way.

I have analysed the floor for its capacity using the direct design method of ACI, and found that the existing reinforcement is inadequate.

Is there any other way to check the existing salb for its capacity? whether my calculations are correct, or am I missign something?

Thanks for your time


RE: Capacity analysis of two-way slab

Have a second look at the slab. You might be assuming it to be a simply supported slab which will be a very coservative way of looking at it if the corners of the slab are anchored to the support or are held down by weight above. The corners and edge conditions of a slab are very critical parameters if you want to assess the capacity of it.

RE: Capacity analysis of two-way slab

I generally use the Equivalent Frame Method to analyze a two way slab.  You need at least a 2D frame analysis computer program to do this.  PCA's ADOSS program is an even better way to analyze this.

If you continue to find the slab is inadequate, perhaps redistribution of moments will help.


RE: Capacity analysis of two-way slab

The yield line method is probably the one you want as you can use it to analyse any load condition on the slab.  It does require a bit of practice to be able to postulate where the yield lines for the particular support and load conditions will lie.  Most text books on structural analysis should give you the method.

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


White Paper - Implementing a Multi-Domain System
IoT systems are multi-domain designs that often require AMS, Digital, RF, photonics and MEMS elements within the system. Tanner EDA provides an integrated, top-down design flow for IoT design that supports all these design domains. Learn more about key solutions that the Tanner design flow offers for successful IoT system design and verification. Download Now

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