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


Hooked bar in compression

Hooked bar in compression

Hooked bar in compression

When we calculate the capacity of column in pure compression, ACI allows us to use the compression force in rebars together with concrete. But at the connection between that column and the footing, ACI states that hooks can not be used to develop compression. So how the compression force in the rebars transfer to the footing ? The load will disperse from face of the rebar to the footing via bonding ? Does ACI mean that within the column, the rebars contribute to the total resistance, but at the footing, suddenly all the compression will be resisted by the concrete only ? So where the compression in the rebars goes ? It cannot be equal to Fy x As in the column and then becomes zero at the footing suddenly.

RE: Hooked bar in compression

I think the concept is that the compression is simply taken by the concrete and any portion of the compression in the rebar on the compression side is simply transferred out from the bars into the concrete bearing area.

Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies

RE: Hooked bar in compression

The footing must be deep enough to allow the compression to transfer to the concrete through bond over the straight length. The only use for the hook/cog at the bottom is for tieing to the bottom footing reinforcement. It cannot be assumed to transfer any force to the concrete.

RE: Hooked bar in compression

Quote (rapt)

The footing must be deep enough to allow the compression to transfer to the concrete through bond over the straight length.

This. Basically, what you have is a straight bar development that just happens to have a hook on it for construction convenience.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

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!


White Paper: Industrial Control Basics: Contactors
A contactor is an electrical device used for switching an electrical circuit on or off. Considered to be a special type of relay, contactors are used in applications with higher current carrying capacity, while relays are used for lower current applications. Download Now
Research Report: State of IoT Adoption in Product Development 2019
This research report, based on a survey of 234 product development professionals, examines the current state of Internet of Things (IoT) adoption by product design teams, its perceived importance, and what features and capabilities teams consider important when making decision about adding IoT functionality to their products. Download Now
Research Report: Augmented Reality for Maintenance, Repair and Overhaul (MRO)
The term Industry 4.0 denotes a cluster of technologies that’s poised to fundamentally reshape manufacturing and bring about a new industrial revolution. These include 3D printing (AM), the Industrial Internet of Things (IIoT), artificial intelligence (AI) and mixed reality technologies, more commonly known as virtual reality (VR) and augmented reality (AR). 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