*Heading
 B31 Elements, Static Analysis
** Job name: nosubstr_rbm_beam2d_sta Model name: Model-1
*Node
*Element, type=B31
** Region: (Secn:Picked), (Beam Orientation:Picked)
*Elset, elset=I1, generate
** Section: Secn  Profile: Prof
*Beam Section, elset=I1, Section=RECT,material=Elas
1.0, 1.0
0.,0.,-1.
**Nset, nset=_Set4, internal, instance=Beam3d-1
** 1,
**Nset, nset=_Set5, internal, instance=Beam3d-1
** 3,
**
** MATERIALS
**
*Material, name=Elas
*Density
10.,
*Elastic
 1e+08,0.
*step
*frequency,eigen=lanc
10,
*boundary
1,1,6
2,1,6
3,1,6
*node print
u,
*end step
*STEP
*substructure generate, type=z1, overwrite,
recovery matrix=yes, mass matrix=yes,
libr=lib_rbm_beam3d
*RETAINED NODAL DOFS
**,sorted=no
*Retained Eigenmodes
*substructure matrix output, stiffness=yes,
mass=yes, recovery=yes, file=lib_rbm_beam3d
*END STEP