×
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

Mass moment of Inertia according to SAP2000

Mass moment of Inertia according to SAP2000

Mass moment of Inertia according to SAP2000

(OP)
thread801-353850: How does SAP2000 compute the moment of inertia of floor diaphragms about the vertical axis

Hi all!, im doing some research on Isolated Structures, in wich I had to model them on MATLAB software. In order to verificate my results, had to compare them with a comercial software, wich I choosed as SAP2000.

All values were okey, except for one: the Mass Moment of Inertia. I realiced that SAP2000 calculated this values as: m*(Lx^2+Ly^2)/4, but according to all literature its: m*(Lx^2+Ly^2)/12. And its important, cause the research has a highly important rotational behaviour.

When i used the (....)/4 value, my global results where identic to the SAP2000 ones, and now i have the doupt if sticking on to whats teorically correct (....)/12 or what appears to be correct from a well known and respected program.

Any help on this matter would be very greatfull. Thanks!

RE: Mass moment of Inertia according to SAP2000

Hi!

Please explain which element you are checking the mass moment of inertia for. How did you find out that sap2000 calculates the mass moment of inertia as (...)/4? The questions above will help me understand the issue.

Best regards

RE: Mass moment of Inertia according to SAP2000

@Germandsc : How did you infer it uses m*(Lx^2+Ly^2)/4

mass moment of inertia by formula is m*(Lx^2+Ly^2)/12.
Even i am interested to know more.

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