Hi everybody;
Does any one could tell me ho to specify the mass in the modal analysis of a structure by ANsys software. I specified it through Inertia; Gravity commands but i got a very large value of frequency. I think the mass was zero.
Thanks.
"Note that the frequency independs on the gravity so you shouldn´t specify it."
This is not necessarily true; the loading condition could be such that the initial stress state caused by gravity affects the stiffness of the structure. If this is the case, then a pre-stressed modal analysis is needed.