×
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

Cp Calculation for Beam analysis

Cp Calculation for Beam analysis

Cp Calculation for Beam analysis

(OP)
If Lb falls inbetween Lp and Lr the Cb value is required to find the bending moment. Suppose the applied load to the beam is unsymmetric. I have a simple span with an off center point load.
Is the Cb = 12.5M/(2.5M+3Ma+4Mb+3Mc)Rm equation still valid or should I just rely on the AISC available moment charts.

Thanks guys!

RE: Cp Calculation for Beam analysis

Yes, the equation is still valid.  Or, you can always conservatively take Cb=1.0.

RE: Cp Calculation for Beam analysis

(OP)
My Cb value is causing the Mn between Lp<Lb<Lr to be greater than FyZx. How can this be?

RE: Cp Calculation for Beam analysis

You can never use Mn > Mp (FyZx). The upper bound is Mp

RE: Cp Calculation for Beam analysis

Slick is right. In fact, every beam limit state has as its upper limit Mn= xxx <= Mp.

What Cb allows you to do is shift the entire LTB moment curve "up", but never beyond the plastic moment 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.

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