# SACS Shell Problem in generating self weight and receiving pressure

Dear All,

Here I attached my sacs input where I modelled 2x2 shell connected to tubular legs. I assign the shell to have a density of 2.5 tonne/m3 in the Shell group and subjected to 0.1 kN/cm2 pressure in load condition "BSTC". The listing and postvue have been succesfully generated along with the shell stress. However, I found 2 particular weird things by looking at the listing, i.e.:

1. The total of the selfweight (LOADCN: BSWS) is only equal to the weight of the tubular legs whereas I have specified the shell group density.

2. The load summation of LOADCN BSTC is equal to zero in all directions, meaning the program does not read the shell pressure.

3. The total of Vertical Joint Reaction (see LOADCOMB GRAV) does not equal to load summation of LCOMB GRAV and not symmetric

```LDOPT       NF+Z1.0250007.850000                GLOBMN          CMB
OPTIONS      MN         UC   2 1B  DC  C    PTPTPTPT    PTPT
LCSEL
LCSEL           GRAV
GRUP
GRUP L1          91.400 3.180 20.007.69231.00 1    1.001.00          F7.8500
GRUP W.B         91.400 3.180 20.007.69231.00 1    1.001.00          N7.8500
MEMBER
MEMBER FX01X001 L1                                 2.102.10
MEMBER FX02X002 L1                                 2.102.10
MEMBER FX03X003 L1                                 2.102.10
MEMBER FX04X004 L1                                 2.102.10
MEMBER X001X101 W.BSK              180.00
MEMBER X002X102 W.BSK              180.00
MEMBER X003X103 W.BSK              180.00
MEMBER X004X104 W.BSK              180.00
SHLGRP
SHLGRP SHL F   100.000  3.180 0.300 35.000    2.5   6.5000
SHELL
SHELL0A001 01340202X101027302770210014201380206SHL                         11.70
SHELL0A002 0142021002770281X1020218015001460214SHL                         11.70
SHELL0A004 000700740142014601500082X10300110078SHL                         11.70
SHELL0A003 X10400660134013801420074000700030070SHL                         11.70
JOINT
JOINT 0003      2.     3.     4.  0.020        83.800
JOINT 0007      3.     3.     4.  0.020        83.800
JOINT 0011      4.     3.     4.  0.020        83.800
JOINT 0066      1.     4.     4.  0.021        83.800
JOINT 0070      2.     4.     4.  0.021        83.800
JOINT 0074      3.     4.     4.  0.021        83.800
JOINT 0078      4.     4.     4.  0.021        83.800
JOINT 0082      5.     4.     4.  0.021        83.800
JOINT 0134      1.     5.     4.  0.021        83.800
JOINT 0138      2.     5.     4.  0.021        83.800
JOINT 0142      3.     5.     4.  0.021        83.800
JOINT 0146      4.     5.     4.  0.021        83.800
JOINT 0150      5.     5.     4.  0.021        83.800
JOINT 0202      1.     6.     4.  0.021        83.800
JOINT 0206      2.     6.     4.  0.021        83.800
JOINT 0210      3.     6.     4.  0.021        83.800
JOINT 0214      4.     6.     4.  0.021        83.800
JOINT 0218      5.     6.     4.  0.021        83.800
JOINT 0273      2.     7.     4.  0.021        83.800
JOINT 0277      3.     7.     4.  0.021        83.800
JOINT 0281      4.     7.     4.  0.021        83.800
JOINT FX01      1.     7.    -9.  0.021       -35.150 111111
JOINT FX02      5.     7.    -9.  0.021       -35.150 111111
JOINT FX03      5.     3.    -9.  0.020       -35.150 111111
JOINT FX04      1.     3.    -9.  0.020       -35.150 111111
JOINT X001      1.     7.     3.  0.021        73.800
JOINT X002      5.     7.     3.  0.021        73.800
JOINT X003      5.     3.     3.  0.020        73.800
JOINT X004      1.     3.     3.  0.020        73.800
JOINT X101      1.     7.     4.  0.021        83.800 222000
JOINT X102      5.     7.     4.  0.021        83.800 222000
JOINT X103      5.     3.     4.  0.020        83.800 222000
JOINT X104      1.     3.     4.  0.020        83.800 222000
LOAD   X104     500.000                                     GLOB JOIN   FX
LOAD   X101     500.000                                     GLOB JOIN   FX
LOAD   X103     500.000                                     GLOB JOIN   FX
LOAD   X102     500.000                                     GLOB JOIN   FX
*
LCOMB
LCOMB GRAV BSTC1.0000BSWS1.0000
END
**JNCV** 0 0 0 0 0 0 0 0
END
```

Regards,

Parents