Applied load on arch

if I want to apply square distributed load over certain area of the arch, do apply that by using stress or force .

Probably you want to use stress. If you apply a stress, 3DEC will work out the required forces on each node based on the areas of the triangular zone faces. You can plot the applied forces as vectors to see the results.

Can you please tell me which command can I use to plot the applied forces??

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