×
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.

# Concrete Pedestal Min. Reinf

## Concrete Pedestal Min. Reinf

(OP)
What's min. reinf for short concrete pedestals? Some engineers use from 0.5% to 1.0%. Thanks. IV
Replies continue below

### RE: Concrete Pedestal Min. Reinf

Even though they don't have the buckling issue I still use 1% as a minimum and design them as short columns.

### RE: Concrete Pedestal Min. Reinf

The rationale for .5 comes from ACI 318 10.8.4 (if satisfied) - otherwise 1.

### RE: Concrete Pedestal Min. Reinf

A pier/pedestal is still a short column and the 1% rienforcement rule applies.  However, jt12 is correct, treat the pier as architectural concrete and use the absolute minimum 0.5% since 10.8.4 states that the maximum reduction of section for architectural concrete is half the provided/original section, hence 1% goes to 0.5%.  You still need to check if the section can be treated as architectural concrete.  If the size of the pedestal for compression needed is larger than 0.5 x the pedestal provided, you have to use the ratio: 1% x (pedestal required by analysis) / (pedestal provided).  This will give you the amount of reiforcement for your short pier.

### RE: Concrete Pedestal Min. Reinf

No reinforcement is required for pedestals with the ratio of unsupported height to average least lateral dimension less or equal to three,(when designed as Structural Plain Concrete). ACI 318-05, 22.8

### RE: Concrete Pedestal Min. Reinf

Structural Plain Concrete is ok as long as you don't have net wind uplift on the column -in which case, I'd not depend on the concrete tensile capacity.

#### 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!