×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

RISA Member Detail Report

RISA Member Detail Report

RISA Member Detail Report

(OP)
Using RISA-3D, I analyzed a steel frame.  This is an existing frame, which I am checking the adequacy of its members.  My analysis showed the columns to be overstressed (at 1.18), in combined loading.  I used the Member Detail
Report in RISA to clarify the output and begin considering options on reinforcing the columns.  (I plan on adding plate or channels to the columns where the overstress occurs.)  The MDR shows where the overstress occurs,
but the information regarding AISC unity equation H1-1 given does not match the variables noted in my 9th edition manual. Has anyone come across this? If so, where do I look for clarification on how RISA calculates these variables?  As always, any comments would be greatly appreciated.
 

RE: RISA Member Detail Report

What variables don't match?  There are a couple of things that I would look at if I were you:

1) Confirm that the program is really calling out equation H1-1 as the controlling equation.

2) When using eqn H1-1, the Cb must be taken as 1.0 for non-sway frame members.

3) Cm will be based on the moments and on whethr the sway flags have been checked:

4) For WT's and Double Angles, the KL/r reported may actually be an "effective" KL/r for flexural torsional buckling per equation C-E2-2 on page 5-142.  

I hope that helps!

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



News


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