×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

Fatigue stress limit for a bar with end cogs -AS 5100.2-2017

Fatigue stress limit for a bar with end cogs -AS 5100.2-2017

Fatigue stress limit for a bar with end cogs -AS 5100.2-2017

(OP)
In AS5100.2-2017 Table 2.2.5 "Permissible Tensile Fatigue Stress Ranges in Steel" provided for reinforcement an equation "150 (0.35 + 0.0026 d_1/d_b)", with d_b defined as the diameter of rebar and d_i defined as the nominal internal diameter of reinforcement bend or hook. It is not clear whether the intention of this clause is to restrict the stress range of the entire bottom rebar end-anchored by cogs to 72 MPa. Or whether the 72MPa restriction applies only to the the bent portion of the cogs. Please discuss.

Also, this equation does not place a upper limit to the bracketed-term factor applied to 150. For a straight bar, d_i approaches infinity and this implies that the stress range allows is infinity which is clearly not correct. For a straight bar, it should be 150 MPa as per the value in the previous version of this standard.

RE: Fatigue stress limit for a bar with end cogs -AS 5100.2-2017

My understanding is

Only apply a reduction within the bent portion of the bar, I.e where the damage is.

Re the Upper limit, Yes it is an error.
It is a reduction factor, so value of the multiplier should not be greater than 1.0.

RE: Fatigue stress limit for a bar with end cogs -AS 5100.2-2017

(OP)
Thank you Rapt for your comment. A follow on question is how to determine the elastic stress in the curved portion of a bar at a closing corner of a frame since the corner is a disturbed region and plane section remains plane does not apply.

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!


Resources


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