Beam element equilibrium

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Beam element equilibrium

fea_discussion
All,

I got an output of element forces on a beam element in the .dat file.

The results are:
   THE FOLLOWING TABLE IS PRINTED FOR ALL ELEMENTS WITH TYPE B31

    ELEMENT  FOOT-   NODE        NFORC1      NFORC2      NFORC3      
NFORC4      NFORC5      NFORC6  
             NOTE
          35            83666   5225.       5524.     -1.7545E+04 -
1.5729E+04  3.1277E+04 -5.9160E+04
          35            83699  -5225.      -5524.      1.7545E+04  -
1838.      1.4373E+05  1.0903E+05

Element number 35 with connecting nodes as 83666 and 83669, the
NFORC1, 2 and 3 are logical (in the sense that the values are equal
and opposite and hence Sigma Fx, y and z will be = 0).

However the NFORC4, 5 and 6 values are not equal and opposite which i
would expect they should.
Over and above that the resultant of those moments (Mx^2+My^2+Mz^2)
^0.5 at the 2 nodes is also not same.

Am I missing something here?

Regards

Nitin.








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