modal analysis with body forces

[provic]

is there example with body forces for modal analysis.

using imodal from http://feap.berkeley.edu/forum/index.php?action=post;topic=185.0;last_msg=674.

remove cforce line, add body forces to material.

material 1
  frame
    elastic isotropic 1000
    density mass      1
    cross section     10  1
    body forces 1 1

get all zero results. is this correct use.

use feap 8.4

[Prof. R.L. Taylor]

FEAP currently does not support use of body forces as loading in a modal analysis.