problem description
title="Cantilever beam: Modal analysis"
nodes=5 elements=4 analysis=modal

analysis parameters
mass-mode=consistent

nodes
1  x=0 y=0 z=0 constraint=encanstre
2  x=2 y=0 z=0 constraint=free
3  x=4 y=0 z=0
4  x=8 y=0 z=0
5  x=12 y=0 z=0

beam elements
1  nodes=[1,2] material=steel
2  nodes=[2,3]
3  nodes=[3,4]
4  nodes=[4,5]

material properties
steel E=3e+07 A=0.0625 Ix=0.000325 rho=0.000735

constraints
encanstre Tx=c Ty=c Tz=u Rx=u Ry=u Rz=c
free      Tx=u Ty=u Tz=u Rx=u Ry=u Rz=u

end
