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