Anchor support result

Dear all
When we give anchor at any node in the result all FX,FY,FZ,MX,MY,MZ We will get values because anchor support arrest all 6 degree of freedom, In my report Mx is become zero why,how?. axis of the pipe is x-axis

pls advise

regards
pipeman

pipeman,

The forces and /or the moments loads at an anchor could be zero when the forces or moments balance or cancel out at the node when there is symmetry. This is theoratically possible in the analysis, but in reality the friction and installation tolerances make it some value more than zero.

Now if your piping model runs in just two axis (single plane), say the x and y axis, then there probably is not out of plane forces to generate a moment load for the Mx axis.