Contact US

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!

*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

Punching Shear of Piles on a raft foundation

Punching Shear of Piles on a raft foundation

Punching Shear of Piles on a raft foundation

Hi, I modeled a 44 story building in ETABS and I want to design its foundation on SAFE, the foundation consists of MAT on Piles, I must say that all my supporting elements consist of shear walls.
The mat foundation (concrete f'c 35 MPa) 2 m thick and having punching shear reinforcement around shear walls (if I didn't use punching shear I would had a 3 m thick mat foundation)
After Exporting the loads from ETABS to SAFE a deep beam was automatically generated but because SAFE was giving me an N/C symbol for punching shear ratio I decided to remove the deep beam and replace it with a STIFF slab under each shear wall.

The following results for punching shear are as shown below

As you can see the punching ratio is too high.

When I went to check the punching shear calculation I saw the following

I also modeled the piles as point spring having a stiffness of EA/L but it gives the same results

What could have I done wrong ? I repeated the model 10 times and still the same result!
I attached a link of the SAFE file if someone could take a look at the strange calculation that I am having. Thank you in advance

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