harmonic analysis failure

[narda]

hi to all,

i´m trying to model a plate with ribs (a real constant for plate and another one for the ribs because of different thicknesses) and do a harmonic analysis at the eigenfrequencies by using shell elements. i have 2 problems.

1)when i model the ribs on the plate i can´t define an element table on the GUI or when i try to do that with APDL i get zero deformation. my written code looks like that partially:

/PREP7

K,1,0,0,0
K,2,a,0,0
K,3,a,b,0
K,4,0,b,0
K,5,0,0.300,z1
K,6,0.200,0,z1
K,7,0.650,0.300,z1
K,8,0.200,0.900,z1
K,9,0,0.300,0
K,10,0.200,0,0
K,11,0.650,0.300,0
K,12,0.200,0.900,0

LSTR,1,2
LSTR,2,3
LSTR,3,4
LSTR,4,1
LSTR,5,7
LSTR,6,8
LSTR,5,9
LSTR,6,10
LSTR,7,11
LSTR,8,12
LSTR,9,11
LSTR,10,12

AL,1,2,3,4
AL,9,11,7,5
AL,10,12,8,6

MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,E
MPDATA,PRXY,1,,mue
MPDATA,DENS,1,,rho

ET,1,SHELL93
R,1,d1, , , , , ,

KEYOPT,1,5,1
KEYOPT,1,8,2

ASEL,S,AREA,,1
Esize,divisor1
AMESH,1
CM,Platte,ELEM

ET,2,SHELL93
R,2,d2, , , , , ,
KEYOPT,1,5,1
KEYOPT,1,8,2

TYPE, 1
MAT, 1
REAL, 2
ESYS, 0

ASEL,S,AREA,,2
Esize,divisor2
AMESH,2,3
CM,Rippe1,ELEM

ASEL,S,AREA,,3
Esize,divisor2
AMESH,2,3
CM,Rippe2,ELEM

NUMMRG,NODE
NUMMRG,ELEM
NUMMRG,KP
NUMMRG,MAT
NUMMRG,TYPE
NUMMRG,CP
NUMMRG,CE

/SOLU

LSEL,S,LINE,,1,4
DL,ALL, ,UX,
DL,ALL, ,UY,
DL,ALL, ,UZ,

*DO,q,1,efmax,1

F,309,FZ,1

ANTYPE,3

HROPT,FULL
HROUT,ON
LUMPM,0

EQSLV,FRONT,0,
PSTRES,0

HARFRQ,Frequenz(q),Frequenz(q),
NSUBST,1,
KBC,0

ALPHAD,0,
BETAD,0,
DMPRAT,eta,
OUTRES,all,all

/STATUS,SOLU
SOLVE

*ENDDO
/POST1

SET,,,,0,,
ETABLE,Uz_real,U,Z

SET,,,,1,,
ETABLE,Uz_imag,U,Z

2)Lastly is it possible to select the displacements of elements on different areas, in this case 2 ribs ( displacements in x and y direction) and the plate (displacement in z direction) and do some mathematical operations?